CN207528307U - Floating-ball fluid level transmitter - Google Patents
Floating-ball fluid level transmitter Download PDFInfo
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- CN207528307U CN207528307U CN201721616800.1U CN201721616800U CN207528307U CN 207528307 U CN207528307 U CN 207528307U CN 201721616800 U CN201721616800 U CN 201721616800U CN 207528307 U CN207528307 U CN 207528307U
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Abstract
The utility model provides a kind of floating-ball fluid level transmitter, the liquid level sensing unit of its measuring circuit is the resistance string of several substitutional resistances series connection, each tongue tube is equidistantly arranged on socket interior circuit board, the measurement and control unit of measuring circuit is the measure-controlling unit comprising constant-current source and A/D converter, two connectivity ports that the both ends of resistance string switch selection with Constant current input end front end are connect, and the two acquisition ports for switching selection with A/D converter positive input terminal front end are connect, the sys node end of each tongue tube is connected to A/D converter negative input end all the way, another way is connected with the benchmark resistance value bleeder circuit as A/D converter reference voltage.The technical program compensates for the technological deficiency of layering measurement capability of the floating ball type liquid level measuring device without separating layer mixture condition, also has in the technological merit for occurring nor affecting on measurement during tongue tube damage, properties of product enhancing, reliability improve.
Description
Technical field
The utility model is related to fluid level transmitter more particularly to float ball type level transducers.
Background technology
What is be most widely used in liquid level emasuring device is floating-ball fluid level transmitter, form substantially include gauge outfit, with
Socket that gauge outfit is tightly connected, the magnetic floating ball slided along socket, if longitudinal direction is equidistantly placed in PCB circuit board in socket
Dry tongue tube, each tongue tube are connected in resistance series circuit, form each substitutional resistance fault control switch, resistance series circuit
One end be connected to constant current source output terminal, while connect the positive input terminal of A/D converter, the other end and dry-reed tube switch one end connect
A/D converter negative input end is connected to, while the end is also associated with a reference resistance to ground, the reference voltage input of A/D converter
End is connected to the reference resistance both ends, and composition method surveys resistance value circuit, and according to the resistance value size and each resistance value generation measured
The level value of table determines current liquid level.
Such floating-ball fluid level transmitter slides into stable position with liquid level according to Archimedes buoyancy principle, floating ball in socket,
With the corresponding tongue tube magnetic coupling in the stabilization position in socket, program by height value and tongue tube be closed on total resistance value it
Between linear relationship, calculate and obtain level value, the exemplar schematic structure of measuring circuit is as shown in Figure 1.
The liquid level sensing element of floating-ball fluid level transmitter be tongue tube, therefore product measure reliability rely on substantially it is dry
The device quality of reed pipe, the quality problems that cannot be disconnected after being closed occurs in a certain tongue tube, will result in a whole set of transmitter
It can not work, detection of stopping work takes, overhauls heavy workload；In addition, for there are the detection operating mode of liquid level separating layer, it is only few
Amount import radar instrument can realize that a certain separating layer thickness measures, and existing floating-ball fluid level transmitter can not be completed, and
Import Meter cost is expensive, is also vulnerable to interference in measurement.
Utility model content
The goal of the invention of the utility model is to improve existing floating ball type liquid level measuring mechanism, provide a kind of in a certain sense
Component tongue tube is answered to remain to normally complete level gauging, and the layering measurement capability with separating layer mixture condition when something goes wrong
Floating-ball fluid level transmitter.
The utility model provides floating-ball fluid level transmitter technical solution, and main technical content is：A kind of Floating Ball Liquid Level becomes
Device is sent, including gauge outfit, socket, magnetic floating ball and measuring circuit along socket slip, if the liquid level sensing unit of measuring circuit is
The resistance string of dry substitutional resistance series connection, a tongue tube in parallel on the series connection node between each adjacent resistor, each tongue tube are equidistant
Be arranged on the strip circuit plate in socket inner axis, in the measurement and control unit of measuring circuit setting gauge outfit, measurement and control unit be comprising
The measure-controlling unit of constant-current source and A/D converter, both ends and the Constant current input end front end of resistance string switch the two of selection
Connectivity port connect, and with A/D converter positive input terminal front end switch selection two acquisition ports connect, the parallel connection of each tongue tube
Node side is connected to A/D converter negative input end all the way, and another way is connected with the benchmark resistance value as A/D converter reference voltage
Bleeder circuit.
In above-mentioned overall technical architecture, two constant-current sources are included in measurement and control unit.
In above-mentioned overall technical architecture, measurement and control unit includes two A/D converters.
In above-mentioned overall technical architecture, socket slides be equipped with lightweight magnetism floating ball and heavy magnetism floating ball above and below.
Floating-ball fluid level transmitter technical solution disclosed in the utility model is based on existing floating ball type liquid level measuring device
Improved technology scheme, it is overcome on the basis of the technical advantages that keep that original structure is simple, price is low etc. when a certain dry spring
Pipe sensor component damages and can not continue to realize the technical deficiency for measuring operation, and the layering for compensating for separating layer mixture condition measures
Technological deficiency, make floating ball type liquid level detection technique that can equally realize that layering with separating layer mixture condition measures, fill up
The detection technique blank of the separating layer mixture condition of floating ball type liquid level detection technique improves properties of product enhancing, reliability,
Actual motion is reliable.
Description of the drawings
Fig. 1 is the measuring circuit schematic diagram of the utility model.
Fig. 2 and Fig. 3 is respectively two circuit work sheets in the measurement process of single-floating ball working condition measuring.
Fig. 4 is circuit diagram when the double floating ball medium separating layers of the utility model measure.
Fig. 5 and Fig. 6 is the circuit work sheet that the medium separating layer based on Fig. 4 measures respectively.
Specific embodiment
Floating-ball fluid level transmitter provided by the utility model, composition include gauge outfit, socket and the magnetism slided along socket
Floating ball, measuring circuit include liquid level sensing unit and measurement and control unit.The strip circuit plate of liquid level sensing unit is pacified along tube axis
In socket, socket is tightly connected with gauge outfit, and measurement and control unit is mounted in gauge outfit, is controlled by internal processes, collection liquid
Position sensing unit pick-up analog signal starts A/D converter conversion, is calculated by internal processes, obtains level value metrical information, by
Gauge outfit liquid crystal screen displays directly display, and can also pass through the 4-20mA current signals of DAC circuit outputting standard.Due to the application's
Design core is measuring circuit, and is not lain in the setting structure of gauge outfit, socket and magnetic floating ball, therefore attached structure chart of not going to live in the household of one's in-laws on getting married
The understanding of the technical program is not influenced.
As shown in the figure, the liquid level sensing unit is several substitutional resistance R5, R6, R7, R8 ... RnThe resistance string of series connection
Road, series connection node m1, m2, m3 between adjacent resistor ... mn respectively one tongue tube S1, S2 of parallel connection, S3 ... Sn, each tongue tube
S1, S2, S3 ... Sn is equidistantly arranged in successively on the strip circuit plate in socket, and socket is placed in liquid medium perpendicular to liquid level
In, magnetic floating ball is slid into a certain liquid level by buoyancy along socket outer wall.
Measurement and control unit is set in gauge outfit, in measurement and control unit the microprocessor comprising two constant-current sources and two A/D converters or
Person's A/D chips can also be that is used in the present embodiment includes the work(of a constant-current source, an A/D converter and multiplexer MUX
Can chip U1, such as chip AD7794, multiplexer MUX as constant-current source and A/D converter input terminal and two connectivity ports and
The switching selecting circuit of two acquisition ports：The both ends of resistance string are electrically connected respectively with two connectivity port IEX0, IEX1 of constant-current source
It connects, and is electrically connected with two acquisition port AIN0, AIN1 of A/D converter, chip U1 internal programs control multiplexer MUX is completed
Two connectivity port IEX0, IEX1 and the selection switching connection of Constant current input end, complete two acquisition port AIN0, AIN1 and A/D and turn
The selection switching connection of parallel operation positive input terminal.Each tongue tube S1, S2, S3 ... the sys node end of Sn be connected to all the way A/D conversion
Device negative input end, another way are connected with the reference resistance R4 bleeder circuits of the benchmark resistance value as A/D converter reference voltage, even
A/D converter reference edge Vref+, Vref- are connected to, reference resistance R4 is high-precision, the resistance of Low Drift Temperature.
It is specific as follows that it measures work：
1st, single-floating ball liquid level or boundary position working condition measuring
It is slided on socket and is equipped with single magnetic floating ball.If：Each resistance of resistance string road is R, and each tongue tube
Spacing for L, socket height is H；Assuming that：The tongue tube S3 institutes that floating ball is in socket by buoyancy are in place, and tongue tube S3 is caused to close
It closes, then liquid level height is expressed as H below tongue tube S3L, upper level height be expressed as HH。
It measures the course of work：
Multiplexer MUX is programmed, and the first connectivity port IEX0 is electrically connected with Constant current input end, and synchronizing will
First acquisition port AIN0 is connected with the switching of A/D converter positive input terminal, as shown in Figure 2.Electric current I flows through Rn, Rn- by IEX0
1 ... .R8, tongue tube S3 and reference resistance R4 bleeder circuits, then A/D converter sample voltage value be：, the benchmark of A/D converter
It is R4 both end voltages to hold Vref+, Vref- reference voltage：IR4, because electric current I and resistance R4 is known quantity, if setting A/D conversions
The precision of device is 16, then the acquisition maximum value of A/D converter is 216=65535, if the number of current A/D converter sample conversion
Word amount is Dat, then sets up, then, obtains total resistance value, then divided by resistance value R, you can obtain liquid level where S3.
Multiplexer MUX is programmed, second connection end mouth IEX1 is selected to be connected with the switching of Constant current input end, together
The second acquisition port AIN1 of step selection is connected with the switching of A/D converter positive input terminal, as shown in Figure 3.A/D converter sampled voltage
For reference edge Vref+, Vref- voltage are IR4, similarly set up, then, obtain total resistance value divided by resistance value R, can obtain dry
Level value on reed pipe S3.
As from the foregoing, it is assumed that tongue tube S3 is damaged, and is closed and cannot be disconnected, if actual liquid level is less than the dry spring of damage at this time
Pipe S3, can repeatedly carry out above-mentioned two measurement process, and measurement obtains HHIt is worth to be always fixed value, and obtains practical level value
For HL；If actual liquid level is higher than damage tongue tube S3, the value H measuredLIt is always fixed value, and practical liquid can be obtained
Place value highly subtracts level value H for socketH, realizing induction pieces --- tongue tube closure cannot but disconnect liquid level during failure
It is normal to measure.
It can be seen that this programme does not influence to measure when there is a certain tongue tube damage, obtained by procedure identification practical
Level value.
2nd, the liquid level working condition measuring of double floating ball medium separating layers：
Two floating balls are equipped in being slided on socket, two floating balls are to correspond to weight configuration according to measured medium density difference
Lightweight magnetism floating ball and heavy magnetism floating ball.
If：Each resistance of resistance string is R, and tongue tube spacing is L, and socket height is H；Assuming that：Heavy magnetism is floated
Ball is suspended in tongue tube Sn-1 institutes in place, is closed tongue tube Sn-1, then liquid level in place tongue tube Sn-1 is HL, gently
Matter magnetism floating ball suspension tongue tube S3 institutes are in place, are closed tongue tube S3, then the liquid level thickness value H on tongue tube S3H, then hang
Floating layer height of liquid layer is HM = H -HL- HH。
Measurement process is realized by following two step：
In the first step, multiplexer MUX is programmed, selects the first connectivity port IEX0 and Constant current input end electricity
Connection, synchronous the first acquisition port AIN of selection are connected with the switching of A/D converter positive input terminal；In second step, multiplexer
MUX is programmed, and second connection end mouth IEX1 is selected to be electrically connected with Constant current input end, synchronous the second acquisition of selection port
AIN1 is connected with the switching of one input terminal of A/D converter.
The first step, constant-current source export stabling current I by the first connectivity port IEX0, as shown in figure 5, current loop is resistance
Rn, Rn-1, tongue tube Sn-1 and benchmark sampling resistor R4, A/D converter sample voltage value are A/D converter reference edge Vref
+, Vref- reference voltages be IR4, similarly then set up with upper, program is calculated total resistance value, then divided by resistance value R, the first step can
The measured value of liquid level where obtaining heavy floating ball：
Second step, constant-current source exports stabling current I by second connection end mouth IEX1, as shown in fig. 6, current loop at this time
It is A/D converter benchmark including resistance R5, R6, R7, tongue tube S3 and benchmark sampling resistor R4, A/D converter sample voltage value
It is IR to hold Vref+, Vref- voltage value4, it is similarly then set up with upper, total resistance value divided by resistance value R is calculated in program, the
Two steps obtain the liquid level thickness value on lightweight floating ball：
By the H for measuring acquisition aboveH、HLWith known H, by HM=H-HH-HLObtain the current intermediate separation layer thickness that suspends
Value.
Claims (4)
1. a kind of floating-ball fluid level transmitter including gauge outfit, socket, magnetic floating ball and measuring circuit along socket slip, measures electricity
The liquid level sensing unit on road is the resistance string of several substitutional resistances series connection, and parallel connection one is dry on the series connection node between each adjacent resistor
Reed pipe, each tongue tube are equidistantly arranged on the strip circuit plate in socket inner axis, the measurement and control unit setting table of measuring circuit
Head in, measurement and control unit be the measure-controlling unit comprising constant-current source and A/D converter, it is characterised in that the both ends of resistance string with
Constant current input end front end switches the two connectivity ports connection of selection, and switches selection with A/D converter positive input terminal front end
Two acquisition port connections, the sys node end of each tongue tube are connected to A/D converter negative input end all the way, and another way is connected with work
Benchmark resistance value bleeder circuit for A/D converter reference voltage.
2. floating-ball fluid level transmitter according to claim 1, it is characterised in that socket slides above and below is equipped with lightweight magnetism
Floating ball and a heavy magnetism floating ball.
3. floating-ball fluid level transmitter according to claim 1 or 2, it is characterised in that two constant-current sources are included in measurement and control unit,
Two Constant current input ends are connect respectively with two connectivity ports.
4. floating-ball fluid level transmitter according to claim 1 or 2, it is characterised in that measurement and control unit includes two A/D conversions
Device, two A/D converters, one input terminal are connect respectively with two acquisition ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721616800.1U CN207528307U (en) | 2017-11-28 | 2017-11-28 | Floating-ball fluid level transmitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721616800.1U CN207528307U (en) | 2017-11-28 | 2017-11-28 | Floating-ball fluid level transmitter |
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| CN207528307U true CN207528307U (en) | 2018-06-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072426A (en) * | 2017-11-28 | 2018-05-25 | 丹东通博电器(集团)有限公司 | During induction pieces failure, separating liquid high measurement method and its floating-ball fluid level transmitter layer by layer |
-
2017
- 2017-11-28 CN CN201721616800.1U patent/CN207528307U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072426A (en) * | 2017-11-28 | 2018-05-25 | 丹东通博电器(集团)有限公司 | During induction pieces failure, separating liquid high measurement method and its floating-ball fluid level transmitter layer by layer |
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