CN109556684A - General type level sensing and remote transmitting system - Google Patents
General type level sensing and remote transmitting system Download PDFInfo
- Publication number
- CN109556684A CN109556684A CN201910034165.3A CN201910034165A CN109556684A CN 109556684 A CN109556684 A CN 109556684A CN 201910034165 A CN201910034165 A CN 201910034165A CN 109556684 A CN109556684 A CN 109556684A
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- flute profile
- liquid level
- emitting diode
- optocoupler
- buoy
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- 239000007788 liquid Substances 0.000 claims abstract description 82
- 239000012530 fluid Substances 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims description 30
- 239000011521 glass Substances 0.000 claims description 23
- 238000005260 corrosion Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract description 3
- 230000011218 segmentation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/68—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means
- G01F23/686—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means using opto-electrically actuated indicating means
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The present invention relates to a kind of general type level sensing and remote transmitting systems, using flute profile photoelectrical coupler (abbreviation flute profile optocoupler) as level sensing element, in conjunction with conversion circuit, liquid level is converted into electric signal driving diode displaying, and sends host computer to through single-chip microcontroller acquisition, communication to show or control liquid level.The present invention carries out segmentation detection, display to the liquid level of liquid in fluid reservoir, and liquid level information is passed to by host computer by microcontroller communication, suitable for transparency, the uncertain various liquid levels of corrosivity detections different under static pressure, structure is simple, it is low in cost, there is wide applicability.
Description
Technical field
The present invention relates to liquid level detection devices, and in particular to a kind of general type level sensing and remote transmitting system.
Background technique
Currently, the sensor of measurement liquid level is more, classify by its transfer principle, resistance-type can be divided into, microwave type, swashed
Light formula, ultrasonic type, inductance type, condenser type, electromagnetic type, piezoelectric type, nuclear radiation formula etc., some is only used for transparency liquid, has
Be only used for non-corrosive liquid, and the price of general type is too high.
Summary of the invention
The purpose of the present invention is: a kind of general type level sensing and remote transmitting system are designed, structure is simple, and it is low in cost, it fits
It is remote for transparency, the uncertain various liquid levels of corrosivity segmentation detections different under static pressure, display and water level information
Distance transmission, has wide applicability.
The principle of the present invention is: using flute profile photoelectrical coupler (abbreviation flute profile optocoupler) as level sensing element, in conjunction with
Liquid level is converted into electric signal driving diode displaying, and sends host computer to through single-chip microcontroller acquisition, communication by conversion circuit
It handles, detection for liquid level under static pressure.
The technical solution of the invention is as follows: the linker of glass pipe type is installed additional to fluid reservoir, along the height side of glass tube
To, corresponding fluid reservoir is minimum and highest liquid level within the scope of equidistant several flute profile optocouplers of installation, place length in glass tube
For it is 1.2 times of flute profile optocoupler spacing, opaque, be not afraid of fluid to be measured corrosion, density be about 0.5 times of fluid to be measured density
, the cylindrical body buoy freely up and down moved in a glass tube；Liquid level in glass tube, buoy height and fluid reservoir in liquid level it is same
Step variation, which height buoy, which is moved to, is just blocked the optical path of the photoelectrical coupler of which height, and converted circuit makes to correspond to
Light emitting diode light instruction liquid level；If it is transparency liquid, buoy reaches which height, the light emitting diode of which height
It just lights, other light emitting diodes are not lighted；If it is opaque liquid, liquid itself can block optical path, buoy
It can cancel, which height is liquid level reach, which height each light emitting diode below is all lighted, shining more than buoy
Diode is not lighted；Since detecting element is not contacted with fluid to be measured, the liquid level of corrosive liquids can detecte；Liquid level output
Signal is acquired by subsequent single-chip microcontroller, is communicated by RS-485, the host computer that liquid level signal is transmitted to a distant place is shown or to liquid
Position is controlled.
The beneficial effects of the present invention are: linker and opaque, corrosion resistant buoy that 1, setting is connected to fluid reservoir, benefit
It is detecting element with flute profile optocoupler, is equipped with conversion circuit, liquid level inspection that be suitble to different transparencies, the uncertain liquid of corrosivity
It surveys and shows, structure is simple, and it is low in cost, there is wide applicability；2, height of liquid level can not only be shown at the scene, but also can be with
It is shown in strange land or liquid level is controlled.
Detailed description of the invention
Fig. 1 is liquid level detection device schematic diagram of the present invention.
Fig. 2 is circuit diagram of the present invention.
Specific embodiment
As shown in Figure 1, 2, the general type level sensing and remote transmitting system include liquid level detection device and circuit two parts.
The liquid level detection device includes fluid reservoir 10, installs linker on fluid reservoir 10；Linker is by being mounted on storage
Connecting tube 20 that the bottom of flow container 10 is connected to fluid reservoir, the vertical glass tubes 1 connecting with connecting tube 20 and glass tube are fixed
Clamp 30 is constituted；Liquid level in glass tube 1 is with height changes such as liquid levels in fluid reservoir 10；In the outside of glass tube 1 along its height
Spend direction, corresponding fluid reservoir is minimum and highest liquid level within the scope of equidistant several flute profile optocouplers 3 of stickup, make at glass tube 1
In the optical path of flute profile optocoupler 3, i.e., between the infrared light-emitting diode and phototriode of flute profile optocoupler 3；It is placed in glass tube 1
Lighttight buoy 2, the length of buoy 2 are 1.2 times of flute profile optocoupler spacing；In this way when liquid level is 0, buoy is in bottom,
The optical path of all flute profile optical couplings is not blocked by buoy；When liquid level is not 0, blocked regardless of liquid level always has by buoy
One or two flute profile optocoupler of optical path；Buoy 2 be cylindrical shape, in glass tube 1 because by buoyancy and gravity in liquid level
Under move freely, use is lighttight, is not afraid of fluid to be measured corrosion, material system that density is about 0.5 times of fluid to be measured density
At.
The circuit part is with single-chip microcontroller IC30(model STC89C52) it is core, by liquid level signal detection conversion and show
Show that circuit, multi-way switch circuit and communicating circuit three parts are connected and composed according to electrical circuit mode.
Liquid level signal detection conversion and display portion include: flute profile optocoupler LR0-LR9, Schmidt trigger IC10
(ST0-ST9, model 74LS14, two), resistance R10-R19, resistance R20-R29, resistance R30-R39, light-emitting diodes
Pipe LED0-LED9；A termination+5V power supply of resistance R10-R19, the other end are distinguished each infrared in access slot shape optocoupler LR0-LR9
The anode of light emitting diode, the minus earth of each infrared light-emitting diode in flute profile optocoupler LR0-LR9；Flute profile optocoupler LR0-
The collector of each infrared phototriode connects+5V power supply in LR9, and emitter connects the input of Schmidt trigger ST0-ST9 respectively
End, the input terminal of Schmidt trigger ST0-ST9 while respectively connecting resistance R20-R29 to ground, Schmidt trigger ST0-
ST9 output end difference series limiting resistor R30-R39 after respectively sending and receiving optical diode LED0-LED9 anode, shine two
The minus earth of pole pipe LED0-LED9；The display of LED0-LED9 liquid level on site.
The structure and principle of the conversion circuit of each flute profile optocoupler be it is identical, now with the conversion of the 8th flute profile optocoupler
For circuit, principle is: after power supply is connected, electric current flows through the infrared of flute profile optocoupler LR8 through current-limiting resistance R18 by+5V power supply
Light emitting diode to ground, infrared light-emitting diode light it is luminous, if the optical path of flute profile optocoupler LR8 is not blocked, infrared light
It is irradiated on its phototriode, the input terminal of phototriode conducting, Schmidt trigger ST8 is high level, through ST8 reverse phase
It is afterwards low level, Light-emitting diode LED 8 is not lighted；Conversely, when the optical path of flute profile optocoupler LR8 is blocked by buoy, then infrared light
It cannot be irradiated on its phototriode, the input terminal of phototriode cut-off, Schmidt trigger ST8 is low level, through ST8
It is high level after reverse phase, Light-emitting diode LED 8 is lighted；Liquid level is same in liquid level, the height of buoy 2 and fluid reservoir 10 in glass tube 1
Step variation, which height buoy 2, which is moved to, is just blocked the optical path of the flute profile optocoupler 2 of which height, which corresponding hair of height
Optical diode is just lighted；The position of 2nd flute profile optocoupler LR2 is in for transparency liquid, such as liquid level, then flute profile optocoupler LR2
Optical path is blocked, then the 2nd Light-emitting diode LED 2 is just lighted；If liquid level be in the 2nd and the 3rd flute profile optocoupler LR2 with
Position between LR3, then the optical path of flute profile optocoupler LR2, LR3 are blocked (because buoy length is the 1.2 of flute profile optocoupler spacing simultaneously
Times), then the 2nd and the 3rd Light-emitting diode LED 2 and LED3 are lighted simultaneously；Do not blocked by buoy the flute profile optocoupler of optical path with
Light emitting diode upper and below is not lighted；For opaque liquid, liquid itself can block optical path, and buoy is desirable
Disappear, the corresponding light emitting diode of the following flute profile optocoupler of liquid level is all lighted, and the light emitting diode more than liquid level is not lighted；
When liquid level is 0 i.e. slack tank, buoy is in bottom, and the optical path of all flute profile optical couplings is not blocked by buoy, and all shines
Diode is not lighted.
The multi-way switch circuit: a variable connector IC20(model 74HC4067 is selected for 16), switch input
End I0-I9 connects the output end of Schmidt trigger ST0-ST9 respectively, and common end COM connects the I/O pin of single-chip microcontroller IC30
Selection control terminal S0-S3(of P1.0, variable connector IC20 are used to select different accesses) I/O of single-chip microcontroller IC30 is met respectively
Pin P2.0-P2.3 is controlled by single-chip microcontroller IC30 and is switched, no matter which has been gated, which signal is switched on monolithic
The P1.0 pin of machine IC30；Single-chip microcontroller IC30 selects variable connector IC20 by the level conversion of pin P2.0-P2.3
It is logical, it is come out successively being acquired per level state (i.e. water level situation) all the way by its P1.0 pin.
The communicating circuit: for RS-485 communication interface chip IC40(model MAX485), RXD and TXD pin pair
It should connect RXD the and TXD pin of single-chip microcontroller IC30, control pin/RE is connected with DE and connects the P3.5 pin of single-chip microcontroller IC30, and 8
Foot connects+5V power supply, 5 feet ground connection, and 6,7 feet connect twisted pair, are connected with host computer；Single-chip microcontroller IC30 passes through RS-485 communication interface core
On the one hand piece IC40 receives the instruction of host computer, another party's brow-up position machine sends liquid level information.
The present invention is for transparency liquid, and using lighttight buoy, the resolution series of liquid level is flute profile optocoupler or luminous two
2 times of pole pipe quantity；For opaque liquid, buoy can be omitted, the resolution series of liquid level is equal to flute profile optocoupler or light-emitting diodes
The quantity of pipe；It is provided with 10 flute profile optocouplers and light emitting diode in the present embodiment, can also increase and decrease as needed, the more liquid of quantity
The resolution of position is finer, otherwise differentiates more rough.
In the present embodiment, the outer diameter of glass tube 1 is 10mm, internal diameter 8mm；2 length of buoy is between 1.2 times of flute profile optocouplers
Away from diameter 7mm, density is about 0.5 times of fluid to be measured density, corrosion-resistant, transparent materials；Flute profile optocoupler LR0-LR9 is
Commercially available optocoupler, groove width 12mm.
Claims (6)
1. general type level sensing and remote transmitting system, including liquid level detection device and circuit two parts；The level sensing dress
It sets including fluid reservoir (10), fluid reservoir installs linker on (10)；Linker is by being mounted on bottom and the liquid storage of fluid reservoir (10)
The connecting tube (20) of tank connection, the vertical glass tubes (1) and glass tube fixation clamp (30) structure being connect with connecting tube (20)
At；Liquid level in glass tube (1) is with height changes such as liquid levels in fluid reservoir (10)；In the outside of glass tube (1) along its height
Direction, corresponding fluid reservoir is minimum and highest liquid level within the scope of equidistant several flute profile optocouplers (3) of stickup, make glass tube (1)
It is in the optical path of flute profile optocoupler (3), i.e., between the infrared light-emitting diode and phototriode of flute profile optocoupler (3)；Glass tube
(1) lighttight buoy (2) is placed in, because freely up and down being moved by buoyancy and gravity with liquid level in glass tube (1)；In this way when
When liquid level is 0, buoy is in bottom, and the optical path of all flute profile optical couplings is not blocked by buoy；When liquid level is not 0, regardless of
How liquid level always has one or two flute profile optocoupler that optical path is blocked by buoy；It is characterized in that: the circuit part is with list
Piece machine IC30(STC89C52) it is core, by liquid level signal detection conversion and display circuit, multi-way switch circuit and communicating circuit
Three parts are connected and composed according to electrical circuit mode.
2. general type level sensing according to claim 1 and remote transmitting system, it is characterized in that the liquid level signal detects
Conversion and display portion include: flute profile optocoupler LR0-LR9, Schmidt trigger IC10(ST0-ST9, model 74LS14, and two
Only), resistance R10-R19, resistance R20-R29, resistance R30-R39,0-LED9 of Light-emitting diode LED；Resistance R10-R19
A termination+5V power supply, the other end distinguish access slot shape optocoupler LR0-LR9 in each infrared light-emitting diode anode, flute profile optocoupler
The minus earth of each infrared light-emitting diode in LR0-LR9；The current collection of each infrared phototriode in flute profile optocoupler LR0-LR9
Pole connects+5V power supply, and emitter connects the input terminal of Schmidt trigger ST0-ST9 respectively, and Schmidt trigger ST0-ST9's is defeated
Enter end while extremely, the output end of Schmidt trigger ST0-ST9 distinguishes series limiting resistor to connecting resistance R20-R29 respectively
The anode of sending and receiving optical diode LED0-LED9, the minus earth of 0-LED9 of Light-emitting diode LED are distinguished after R30-R39；
The display of LED0-LED9 liquid level on site；The structure and principle of the conversion circuit of each flute profile optocoupler be it is identical, it is existing
By taking the conversion circuit of the 8th flute profile optocoupler as an example, principle is: after power supply is connected, electric current is by+5V power supply through current-limiting resistance R18
Flow through the infrared light-emitting diode of flute profile optocoupler LR8 to ground, infrared light-emitting diode light it is luminous, if flute profile optocoupler LR8
Optical path is not blocked, then on Infrared irradiation to its phototriode, phototriode conducting, Schmidt trigger ST8's is defeated
Entering end is high level, is low level after ST8 reverse phase, and Light-emitting diode LED 8 is not lighted；Conversely, working as the light of flute profile optocoupler LR8
When road is blocked by buoy, then infrared light cannot be irradiated on its phototriode, phototriode cut-off, Schmidt trigger
The input terminal of ST8 is low level, is high level after ST8 reverse phase, and Light-emitting diode LED 8 is lighted；Liquid level, buoy in glass tube 1
Which height the variation synchronous with liquid level in fluid reservoir 10 of 2 height, buoy 2 are moved to just the flute profile optocoupler 2 of which height
Optical path is blocked, which corresponding light emitting diode of height is just lighted；2nd flute profile optocoupler is in for transparency liquid, such as liquid level
The position of LR2, then the optical path of flute profile optocoupler LR2 is blocked, then the 2nd Light-emitting diode LED 2 is just lighted；If liquid level is in
Position between 2nd and the 3rd flute profile optocoupler LR2 and LR3, then the optical path of flute profile optocoupler LR2, LR3 are blocked simultaneously (because floating
Drift length is 1.2 times of flute profile optocoupler spacing), then the 2nd and the 3rd Light-emitting diode LED 2 and LED3 are lighted simultaneously；No
It is not lighted by the light emitting diode that buoy blocks the flute profile optocoupler above and below of optical path；For opaque liquid, liquid
Itself optical path can be blocked, buoy can be cancelled, and the corresponding light emitting diode of the following flute profile optocoupler of liquid level is all lighted, and be in liquid level
Above light emitting diode is not lighted；When liquid level is 0 i.e. slack tank, buoy is in bottom, the optical path of all flute profile optical couplings
It is not blocked by buoy, all light emitting diodes are not lighted.
3. general type level sensing according to claim 1 and remote transmitting system, it is characterized in that the multi-way switch circuit:
A variable connector IC20(model 74HC4067 is selected for 16), switch input terminal I0-I9 connects Schmidt trigger respectively
The output end of ST0-ST9, common end COM connect the selection control of I/O the pin P1.0, variable connector IC20 of single-chip microcontroller IC30
End S0-S3(is used to select different accesses) I/O pin P2.0-P2.3 for meeting single-chip microcontroller IC30 respectively, by single-chip microcontroller IC30
Control switching, no matter which has been gated, which signal is switched on the P1.0 pin of single-chip microcontroller IC30；Single-chip microcontroller IC30
Variable connector IC20 is gated by the level conversion of pin P2.0-P2.3, per level state (i.e. water level all the way
Situation) it is successively acquired and comes out by its P1.0 pin.
4. general type level sensing according to claim 1 and remote transmitting system, it is characterized in that the communicating circuit: for
RS-485 communication interface chip IC40(model MAX485), the corresponding RXD and TXD for meeting single-chip microcontroller IC30 of RXD and TXD pin draws
Foot, control pin/RE are connected with DE and connect the P3.5 pin of single-chip microcontroller IC30, and 8 feet connect+5V power supply, 5 feet ground connection, and 6,7 feet connect
Twisted pair is connected with host computer；On the one hand single-chip microcontroller IC30 receives the finger of host computer by RS-485 communication interface chip IC40
It enables, another party's brow-up position machine sends liquid level information.
5. general type level sensing according to claim 1 and remote transmitting system, it is characterized in that buoy (2) is in cylindrical body,
Length is 1.2 times of flute profile optocoupler spacing, diameter 7mm, by it is opaque, be not afraid of fluid to be measured corrosion, density it is about tested
The material that 0.5 times of fluid density is made.
6. general type level sensing according to claim 1 and remote transmitting system, it is characterized in that: the outer diameter of glass tube (1) is
10mm, internal diameter 8mm；Flute profile optocoupler LR0-LR9 is commercially available optocoupler, groove width 12mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910034165.3A CN109556684A (en) | 2019-01-15 | 2019-01-15 | General type level sensing and remote transmitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910034165.3A CN109556684A (en) | 2019-01-15 | 2019-01-15 | General type level sensing and remote transmitting system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2235112Y (en) * | 1995-07-26 | 1996-09-11 | 蔡亮 | Photoelectric sensor level instrument |
| CN201020295Y (en) * | 2007-03-12 | 2008-02-13 | 河北工业大学 | Rectification tower |
| CN101135576A (en) * | 2007-09-30 | 2008-03-05 | 赵廷恩 | Circuit using infrared light emitting diodes and light sensitive transistor in water |
| CN103105214A (en) * | 2013-01-21 | 2013-05-15 | 河南理工大学 | Detecting device of coal bunker material level |
| CN204535820U (en) * | 2014-11-19 | 2015-08-05 | 重庆工业职业技术学院 | Bar shaped liquid level indicating circuit |
| CN108955833A (en) * | 2018-08-20 | 2018-12-07 | 天长市瑞达仪表电缆材料厂 | A kind of variable alarm device of magnetic double level gauge |
| CN209372194U (en) * | 2019-01-15 | 2019-09-10 | 淮安信息职业技术学院 | A kind of general type liquid level detection device |
-
2019
- 2019-01-15 CN CN201910034165.3A patent/CN109556684A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2235112Y (en) * | 1995-07-26 | 1996-09-11 | 蔡亮 | Photoelectric sensor level instrument |
| CN201020295Y (en) * | 2007-03-12 | 2008-02-13 | 河北工业大学 | Rectification tower |
| CN101135576A (en) * | 2007-09-30 | 2008-03-05 | 赵廷恩 | Circuit using infrared light emitting diodes and light sensitive transistor in water |
| CN103105214A (en) * | 2013-01-21 | 2013-05-15 | 河南理工大学 | Detecting device of coal bunker material level |
| CN204535820U (en) * | 2014-11-19 | 2015-08-05 | 重庆工业职业技术学院 | Bar shaped liquid level indicating circuit |
| CN108955833A (en) * | 2018-08-20 | 2018-12-07 | 天长市瑞达仪表电缆材料厂 | A kind of variable alarm device of magnetic double level gauge |
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