CN1351249A - Magnetically inductive scale of magnetic-float level gauge - Google Patents
Magnetically inductive scale of magnetic-float level gauge Download PDFInfo
- Publication number
- CN1351249A CN1351249A CN 00123969 CN00123969A CN1351249A CN 1351249 A CN1351249 A CN 1351249A CN 00123969 CN00123969 CN 00123969 CN 00123969 A CN00123969 A CN 00123969A CN 1351249 A CN1351249 A CN 1351249A
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- magnetic
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- test signal
- scale
- circuit board
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Abstract
An magnetically inductive scale of magnetic-float level gauge for oil tank features that on a circuit board there are test signal transmitter and receiver, signal control circuit, and remote transmission circuit of level data, and the magnetically inductive elements are connected between said test signal transmitter and receiver in array mode and arranged on said circuit board at intervals of the scale spacing. It can transmit the level data to level control instrument. Its advantages include high correctness and reliability, simple structure and low cost.
Description
The present invention relates to a kind of liquid level emasuring device, particularly relate to a kind of inductive scale of magnetic of magnetic float liquidlevel meter.
Granted publication number is that 2302506 Chinese patent discloses a kind of digital display liquid level gauge, its technical characterictic is a height of representing liquid level with the position that magnetic float floats with liquid level, and by its action of a magnetic field, the magnetic strength element of conducting respective heights, thereby conducting the test circuit of corresponding scale, liquid level numerical value is presented on the digital display meter.This liquid level comprises chi frame and circuit board foot core in respect of an inductive scale of magnetic, has one group of magnetic strength element to be contained on the circuit board foot core by scale, be connected in parallel on simultaneously quantity identical with liquid level scale one to one on the resistance in series contact.The magnetic float is by magnetic induction conducting magnetic strength element and the resistance corresponding with it, thereby obtain magnitudes of voltage different on the resistance in series, obtain the position of magnetic float then by mould/number conversion, hundreds of the resistance that for this reason in measuring the circuit of higher liquid level, need to connect, thereby be subjected to that analog signal conversion precision and temperature are floated etc. and influence to cause cumulative errors easily.Indivedual magnetic strength component wear of when operation device (as the magnetic strength element adhesion near the initial segment of resistance in series) also may cause the deadlock of inductive scale of magnetic in addition.
The inductive scale of magnetic that the purpose of this invention is to provide a kind of novel magnetic float liquidlevel meter, it can remedy the above-mentioned deficiency of existing inductive scale of magnetic.
A kind of inductive scale of magnetic of magnetic float liquidlevel meter, comprise housing and circuit board, the magnetic strength element is housed on the circuit board, it is characterized in that being equipped with on the circuit board test signal transtation mission circuit, test signal receiving circuit, signal control circuit and liquid level data teletransmission circuit, data bus is arranged on the circuit board.The magnetic strength element is connected between test signal transtation mission circuit and the receiving circuit with matrix-style, and is arranged on the circuit board by the liquid level scale spacing.
Magnetic strength element on the inductive scale of magnetic of the present invention detects magnetic induction signal (liquid level) with position of the switch coded system, and with the liquid level data teletransmission to the liquid level control instrument, no mould/number conversion sum of errors drift, accuracy is good, fiduciary level is high, can satisfy storage tank level gauge test request, simple in structure, cost is low.
Below by embodiment and description of drawings the present invention.
Accompanying drawing 1: profile synoptic diagram.
Accompanying drawing 2: inner structure synoptic diagram of the present invention.
Accompanying drawing 3: circuit block diagram of the present invention.
Accompanying drawing 4: circuit diagram of the present invention.
The present invention includes housing 1 and circuit board 2, magnetic strength element 3 is housed on the circuit board 2, and test signal transtation mission circuit 5, test signal receiving circuit 6, signal control circuit 7 and liquid level data teletransmission circuit 8 are housed, data bus 4 is arranged on the circuit board 2.Magnetic strength element 3 is connected between test signal transtation mission circuit 5 and the test signal receiving circuit 6 with matrix-style, be that magnetic strength element 3 one ends are connected on the determined data bus 4 of test signal receiving circuit 6 input ends, the other end links to each other with an output terminal of the shift register of test signal transtation mission circuit 5.Magnetic strength element 3 total N * m * n, wherein N is the number of terminals D0 to D7 of Data Receiving bus, m is the output terminal subnumber QA to QH of single shift register in the test signal transtation mission circuit 5, n is for forming the cascade shift register sum of test signal transtation mission circuit 5, and magnetic strength element 3 sums and its spacing have been determined inductive scale of magnetic length.Determined unique coding site by each magnetic strength element 3 that liquid level scale (level gauging precision) spacing arrangement is installed on the circuit board 2 by matrix.Test signal transtation mission circuit 5 mainly is made of the cascade shift register, test signal receiving circuit 6 mainly is made of the one group of I/O port and the optocoupler components of single-chip microcomputer, signal control circuit 7 is made of single-chip microcomputer etc., and liquid level data teletransmission circuit 8 is made of serial communication interface, pulse current loop circuit etc.Data bus 4, magnetic strength element 3 and test signal transtation mission circuit 5 sectionals in addition, a shift register and coupled magnetic strength element and one piece of data bus can be made on one section circuit board, and promptly inductive scale of magnetic length can be provided with flexibly.
When the magnetic float was positioned at certain scale position of inductive scale of magnetic, the magnetic strength element 3 of relevant position just had been in conducting state (magnetic strength element at no the action of a magnetic field time be in cut-off state) under the effect of magnetic induction signal.Signal control circuit 7 puts in order by test signal transtation mission circuit 5 cascade shift registers, a lead-out terminal output test signal that makes one of them shift register is to detect corresponding magnetic strength element state, this moment, all the other shift register lead-out terminals all were in disarmed state, the cascade shift register is under clock signal control, and its lead-out terminal is shifted in order and sends test massage.In shift register output test signal, test signal receiving circuit 6 receives this signal from bus.When certain magnetic strength element 3 is in conducting state, just can on data bus 4 respective terminal, obtain the Validity Test signal, signal control circuit 7 is determined magnetic strength the element 3 position encoded and corresponding scale labels of conducting in conjunction with shift count.Just can measure liquid level data and teletransmission to the liquid level control instrument by the foregoing circuit principle of work.Do not act in the moving process of magnetic strength element at the magnetic float, signal control circuit keeps previous measurement data.
Inductive scale of magnetic of the present invention is applicable to cover rod-type magnetic float liquidlevel meter in communicating pipe magnetic float liquidlevel meter and the container.The present invention is lower because of cost simple in structure, can be widely used in level gauging in the container.
Claims (7)
1. the inductive scale of magnetic of a magnetic float liquidlevel meter, comprise housing (1) and circuit board (2), magnetic strength element (3) is housed on the circuit board (2), it is characterized in that being equipped with on the circuit board (2) test signal transtation mission circuit (5), test signal receiving circuit (6), signal control circuit (7) and liquid level data teletransmission circuit (8), data bus (4) is arranged on the circuit board, magnetic strength element (3) is connected between test signal transtation mission circuit (5) and the receiving circuit (6) with matrix-style, and is arranged on the circuit board (2) by the liquid level scale spacing.
2. inductive scale of magnetic as claimed in claim 1 is characterized in that described test signal transtation mission circuit (5) is made of the cascade shift register.
3. inductive scale of magnetic as claimed in claim 1 is characterized in that described test signal receiving circuit (6) is made of the one group of I/O port and the optocoupler components of single-chip microcomputer.
4. inductive scale of magnetic as claimed in claim 1 is characterized in that described signal control circuit (7) is made of single-chip microcomputer.
5. inductive scale of magnetic as claimed in claim 1 is characterized in that described liquid level data teletransmission circuit (8) is made of serial communication interface, pulse current loop circuit.
6. inductive scale of magnetic as claimed in claim 1, it is characterized in that described data bus (4), magnetic strength element (3) and test signal transtation mission circuit (5) sectional, a shift register and coupled magnetic strength element (3) and one piece of data bus (4) can be made on one section circuit board.
7. inductive scale of magnetic as claimed in claim 1, it is characterized in that described magnetic strength element (3) connects with matrix-style, be meant that magnetic strength element (3) one ends are connected on the determined data bus of test signal receiving circuit (6) input end (4), the other end links to each other with an output terminal of the shift register of test signal transtation mission circuit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123969 CN1117267C (en) | 2000-10-27 | 2000-10-27 | Magnetically inductive scale of magnetic-float level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123969 CN1117267C (en) | 2000-10-27 | 2000-10-27 | Magnetically inductive scale of magnetic-float level gauge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1351249A true CN1351249A (en) | 2002-05-29 |
| CN1117267C CN1117267C (en) | 2003-08-06 |
Family
ID=4590258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00123969 Expired - Fee Related CN1117267C (en) | 2000-10-27 | 2000-10-27 | Magnetically inductive scale of magnetic-float level gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1117267C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105745516A (en) * | 2016-02-18 | 2016-07-06 | 东莞正扬电子机械有限公司 | Liquid level detection method and device |
-
2000
- 2000-10-27 CN CN 00123969 patent/CN1117267C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105745516A (en) * | 2016-02-18 | 2016-07-06 | 东莞正扬电子机械有限公司 | Liquid level detection method and device |
| WO2017139960A1 (en) * | 2016-02-18 | 2017-08-24 | 东莞正扬电子机械有限公司 | Fluid level detection method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1117267C (en) | 2003-08-06 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |