CN1873380A - Electromagnetic flowmeter powered by battery - Google Patents
Electromagnetic flowmeter powered by battery Download PDFInfo
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- CN1873380A CN1873380A CN 200510049943 CN200510049943A CN1873380A CN 1873380 A CN1873380 A CN 1873380A CN 200510049943 CN200510049943 CN 200510049943 CN 200510049943 A CN200510049943 A CN 200510049943A CN 1873380 A CN1873380 A CN 1873380A
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Abstract
The invention relates to battery feed electromagnetic flow meter structure improvement. It includes exciting coil, flow measurement circuit, and electrode pack. They are connected with each other. The signal collection unit of the flow measurement circuit inputs the signal from the exciting coil to single-chip microcomputer. Its feature is that the flow measurement circuit is connected with battery feed circuit in electromagnetic flow meter. And it has the advantages of simple structure, wide using range, and stable power supply.
Description
Technical field
The present invention relates to a kind of electromagnetic flowmeter, especially relate to a kind of structural improvement electromagnetic flowmeter powered by battery.
Background technology
In existing electromagnetic flowmeter technology, physical circuit structural form of a great variety, but the power supply form is nothing more than two kinds, a kind of is to adopt external alternating current 220V power supply power supply, by power transformer step-down or switching power circuit, be converted to many group operating voltage, use for metering circuit; Another kind is to adopt the power supply of direct current 24V power supply, by power converting circuit, is converted to many group operating voltage, uses for metering circuit.
For example, Chinese utility model patent document discloses a kind of intelligent electromagnetic flowmeter (application number: 02208234.4), include sensor, field circuit, microcomputer control circuit and output circuit, it has solved anti-interference effectively, improve the measuring accuracy problem and improve the transfer efficiency problem.The patented product adopts the power supply of external alternating current 220V power supply or direct current 24V power supply, operation in the open air, and perhaps remote place etc. can not provide the place of above-mentioned power supply to install and use.Therefore, its range of application has been subjected to very big restriction, and when adopting external power supply electric wire connection with arrange comparatively trouble.
In addition, the scraper type electrode structure of the electromagnetic flowmeter of producing at present roughly is divided into two types: a kind of is to clean, but electrode can easily not split out when electrode damage is serious, and only unloading flowmeter could split out electrode; A kind of is to clean, and can split out replacing at the electrode that does not unload under the flowmeter situation easily well damage again.But present above-mentioned scraper type electrode structure more complicated of producing, cost is higher.For example, Chinese patent literature discloses a kind of detachable blade formula intelligent electromagnetic flowmeter (02243352.X), form by Displaying Meter, housing, last coil, lower coil, electrode assemblie etc., wherein electrode assemblie is a detachable blade formula electrode assemblie structure, this structure is that signal electrode is set on scraping on the knife bar of band scraper, by gland nut with signal electrode with scrape knife bar and be fixed in the pole cup, the pole cup solid welding separates by insulating material between signal electrode and internal surface body, pole cup, gland nut on internal surface body.Though this scheme also can be implemented under the situation of not cutting off medium in the pipe electrode is safeguarded, its structure is comparatively complicated, and processing and fabricating is loaded down with trivial details, and the cost of manufacture height is unfavorable for promoting the use of.In addition, signal electrode is not with to scrape cooperating of knife bar very reasonable, and both concentricitys are difficult to be guaranteed, in case improper use causes stuck phenomenon easily, influence the normal use of electromagnetic flowmeter.
Summary of the invention
The present invention solves the existing in prior technology complex structure, circuit design is very unreasonable, needs to adopt external power supply ability operate as normal, and the limitation of workplace is big, operation in the open air, perhaps remote place etc. can not provide the technical matters that the place of above-mentioned power supply can't be installed and used etc.; Provide a kind of simple in structure, reasonable circuit layout can self-supply power source, is applied to various occasions, and usable range is wide, is easy to promote, the electromagnetic flowmeter powered by battery of on-the-spot directly demonstration measured medium flow.
The present invention has also solved existing in prior technology cost of manufacture height, and processing and fabricating is loaded down with trivial details, is unfavorable for promoting the use of signal electrode and the very unreasonable technical matters that waits of cooperating of electrode scraper; Provide a kind of reasonable in design, simple in structure, cost of manufacture is low, is easy to promote the use of signal electrode and rational electromagnetic flowmeter powered by battery of cooperating of electrode scraper.
It is very unstable that the present invention has solved existing in prior technology power supply power supply again, and voltage fluctuation influences the technical matters in serviceable life of testing result and equipment etc.; Provide a kind of power supply power supply stable, change in voltage is monitored in real time, in time reminds the electromagnetic flowmeter powered by battery of user's power work situation.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: electromagnetic flowmeter powered by battery, comprise field coil, the flow measurement loop that links to each other with field coil, the flow measurement loop links to each other with electrode assemblie, the signal gathering unit in flow measurement loop inputs to single-chip microcomputer with the signal of field coil input, it is characterized in that linking to each other with powered battery loop in being built in electromagnetic flowmeter in described flow measurement loop.The present invention creatively is built in battery in the electromagnetic flowmeter, and battery and electromagnetic flowmeter become one like this, can use in various occasions easily, and needn't worry can't not work because there being power supply.Make it can self-supply power source, be applied to various occasions, usable range be wide, is easy to promote, on-the-spot directly demonstration measured medium flow.
As preferably, be connected with the DC/DC translation circuit on the battery in described powered battery loop, described DC/DC translation circuit links to each other with constant current source, and described constant current source links to each other with field circuit.Constant current source
As preferably, be connected with the under-voltage testing circuit on the battery in described powered battery loop, described under-voltage testing circuit links to each other with single-chip microcomputer.
The powered battery loop produces the operating voltage that flow measurement loop electric energy is provided respectively by the DC/DC translation circuit and the constant current source of field circuit and field coil work is provided.Field coil produces the alternating magnetic field vertical with the flow direction of the fluid that flows through measuring tube.The flow measurement loop is according to cut the magnetic line of force that is produced by field coil on flow direction perpendicular to the fluid that flows through measuring tube, obtain flow measurements at the signal electromotive force of electrode two ends generation, and indicate on display.The battery undervoltage detection circuit changes monitoring in real time to cell voltage, in time reminds the user to change under-voltage battery.
As preferably, described signal gathering unit is passed through pre-amplification circuit successively with the signal of field circuit input, low-pass filter circuit, and sampling hold circuit, differential amplifier circuit and A/D change-over circuit input to single-chip microcomputer; Single-chip microcomputer links to each other with sampling hold circuit by synchronous electric sampler.
For the ease of observing and control,, be connected with display unit and input block on the described single-chip microcomputer as preferably.The display unit here can be display, and input block can be keyboard.
As preferably, described electrode assemblie comprises electrode A, electrode B, and ground-electrode C.By electrode A, electrode B is gathered flow signal.
In addition, as preferably, described electrode assemblie is a detachable blade formula electrode assemblie; Comprise the electrode scraper, be sheathed on the signal electrode in it, the electrode scraper is matched by electrode tip holder and measuring tube, and described electrode scraper periphery is provided with the thread-changing sheet, the thread-changing sheet is fixed on the electrode tip holder by the gland nut that is sheathed on the electrode scraper, is provided with stop nut at the end of electrode scraper; The electrode wires of described thread-changing sheet is passed sealed tube and is linked to each other with peripheral circuit; On described sealed tube, be provided with gland bonnet.When electrode needs care and maintenance, need not cut off pipeline internal medium, only need open gland bonnet rotates back and forth with instrument, in the time of just can scraping off dirt electrode on the signal electrode and be damaged, after cutting off the pipeline medium, flowmeter needn't be pulled down from pipeline, only needs to use the tool to open gland bonnet, the stop nut of back-outing screws out signal electrode and changes and get final product.
Therefore, the present invention has following advantage: 1, reasonable in design, simple in structure; 2, reasonable circuit layout can self-supply power source, is applied to various occasions, and usable range is wide, is easy to promote, the electromagnetic flowmeter powered by battery of on-the-spot directly demonstration measured medium flow; 3, cost of manufacture is low, and signal electrode is reasonable with cooperating of electrode scraper; 4, the power supply power supply is stable, and change in voltage is monitored in real time, in time reminds user's power work situation, changes under-voltage battery.
Description of drawings
Accompanying drawing 1 is a kind of structured flowchart of the present invention;
Accompanying drawing 2 is structural representations of a kind of electrode assemblie of the present invention.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: electromagnetic flowmeter powered by battery, comprise field coil 21, the flow measurement loop II that links to each other with field coil 21, flow measurement loop II links to each other with electrode assemblie, the signal gathering unit III of flow measurement loop II inputs to single-chip microcomputer 29 with the signal of field coil 21 input, and flow measurement loop II links to each other with powered battery loop I in being built in electromagnetic flowmeter.Be connected with DC/DC translation circuit 37 on the battery 36 of powered battery loop I, described DC/DC translation circuit 37 links to each other with constant current source 38, and described constant current source 38 links to each other with digital excitation circuit 31.Also be connected with under-voltage testing circuit 39 on the battery 36 of powered battery loop I, described under-voltage testing circuit 39 links to each other with single-chip microcomputer 29.Signal gathering unit III passes through pre-amplification circuit 24 successively with input signal, low-pass filter circuit 25, and sampling hold circuit 26, differential amplifier circuit 27 and A/D change-over circuit 28 input to single-chip microcomputer 29; Single-chip microcomputer 29 links to each other with sampling hold circuit 26 by synchronous electric sampler 30.Be connected with display unit 35 and input block 34 on the described single-chip microcomputer 29.Electrode assemblie comprises electrode A, electrode B, and ground-electrode C.
Above-mentioned electrode assemblie (as Fig. 2) comprises electrode scraper 2, is sheathed on the signal electrode 1 in it, and the electrode scraper is matched by electrode tip holder 3 and measuring tube 19.Signal electrode 1 is provided with some ring grooves, is provided with the sealing ring 7 that matches with scraper electrode 2 inwalls in ring groove.The inwall of measuring tube 19 is provided with lining 20, and described electrode scraper 2 front ends are provided with the bulge loop that matches with lining 20.Electrode scraper 2 peripheries are provided with thread-changing sheet 6, and the thread-changing sheet is fixed on the electrode tip holder 3 by the gland nut 8 that is sheathed on the electrode scraper 2, are provided with stop nut 9 at the end of electrode scraper 2; The below of stop nut 9 is provided with gland nut 8, and 2 of described stop nut 9 and electrode scrapers are provided with a cavity.Sealed tube 10 is provided with electrode wires cover 17, and the electrode wires cover 17 that electrode wires 18 is passed on the sealed tube links to each other with peripheral circuit.The two ends of sealed tube 10 are matched with measuring tube 19 and wrapper sheet 16 respectively.2 of electrode tip holder 3 and electrode scrapers are provided with lining 4; Described thread-changing sheet 6 has pad 5.Gland bonnet 12 is matched with sealed tube 10 by some bolts 13, and 12 of the end of sealed tube and gland bonnets are provided with O-ring seal 11.
During assembling, electrode tip holder 3 one ends are welded on the measuring tube 19, put O type rubber seal ring 7 on the signal electrode 1 and screw in the electrode scraper 2 and flush to two ends, electrode scraper 2 passes lining 20 from inside to outside and measuring tube 19 enters in the electrode tip holder 3, put lining 4, pad 5 and lug plate 6, be fixed on the electrode tip holder 3 by gland nut 8, screw in another gland nut 8 and stop nut 9, tighten stop nut 9 and pin mobile cavity of formation with gland nut 8, the electrode wires 18 of on lug plate 6, burn-oning, the sealed tube 10 of packing into, electrode wires 18 is passed welded seal pipe 10 on measuring tube 19 and wrapper sheet 16, the O RunddichtringO 11 of packing into from electrode wires cover 17, press gland bonnet 12, and with bolt 13, pad 14 and spring washer 15 are tightened gland bonnet 12.When electrode needs care and maintenance, need not cut off pipeline internal medium, only need open gland bonnet 12 usefulness instruments to rotate back and forth 4～5 times, just can utilize the cooperation of 1 of electrode scraper 2 and signal electrode to scrape off dirt on the signal electrode.In case when electrode was damaged, after the cut-out pipeline medium, flowmeter needn't be pulled down from pipeline, only need with tool to open gland bonnet 12, the stop nut 9 of back-outing, back-out signal electrode 1 is changed and is got final product.
The powered battery loop produces the operating voltage that flow measurement loop electric energy is provided respectively by the DC/DC translation circuit and the constant current source of field circuit and field coil work is provided.Field coil produces the alternating magnetic field vertical with the flow direction of the fluid that flows through measuring tube.The flow measurement loop is according to cut the magnetic line of force that is produced by field coil on flow direction perpendicular to the fluid that flows through measuring tube, obtain flow measurements at the signal electromotive force of electrode two ends generation, and indicate on display.The battery undervoltage detection circuit changes monitoring in real time to cell voltage, in time reminds the user to change under-voltage battery.
Flow measurement loop II shown in Fig. 1, digital excitation circuit 31 provides the field wave of an alternation to field coil 21; Pre-amplification circuit 24 will amplify from two interelectrode electromotive force, input to single-chip microprocessor MCU 29 behind low-pass filter circuit 25, employing holding circuit 26, differential amplifier circuit 27, A/D change-over circuit 28; MCU29 is according to the measured value of A/D change-over circuit 28 inputs, and computing draws the data that conform to actual flow and offers display 35 indication flow measurements; MCU29 provides and replaces the digital excitation ripple that the digital excitation signal provides the digital excitation circuit; MCU29 provides the pulse signal that is synchronized with the digital excitation signal for sampling hold circuit 26; Level according to 39 inputs of battery undervoltage detection circuit produces the information of changing under-voltage battery.
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as flow measurement loop, signal gathering unit, powered battery loop, constant current source, digital excitation circuit, single-chip microcomputer morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.Here Xiang Guan various circuit structures and chip can adopt widely used at present known technology.
Claims (8)
1. electromagnetic flowmeter powered by battery, comprise field coil (21), the flow measurement loop (II) that links to each other with field coil (21), (II) links to each other with electrode assemblie in the flow measurement loop, the signal gathering unit (III) in flow measurement loop (II) inputs to single-chip microcomputer (29) with the signal of field coil (21) input, it is characterized in that linking to each other with powered battery loop (I) in being built in electromagnetic flowmeter in described flow measurement loop (II).
2. electromagnetic flowmeter powered by battery according to claim 1, it is characterized in that on the battery (36) in described powered battery loop (I), being connected with DC/DC translation circuit (37), described DC/DC translation circuit (37) links to each other with constant current source (38), and described constant current source (38) links to each other with digital excitation circuit (31).
3. electromagnetic flowmeter powered by battery according to claim 1 is characterized in that being connected with under-voltage testing circuit (39) on the battery (36) in described powered battery loop (I), and described under-voltage testing circuit (39) links to each other with single-chip microcomputer (29).
4. electromagnetic flowmeter powered by battery according to claim 1, it is characterized in that input signal being passed through pre-amplification circuit (24) successively in described signal gathering unit (III), low-pass filter circuit (25), sampling hold circuit (26), differential amplifier circuit (27) and A/D change-over circuit (28) input to single-chip microcomputer (29); Single-chip microcomputer (29) links to each other with sampling hold circuit (26) by synchronous electric sampler (30).
5. according to claim 1 or 2 or 3 or 4 described electromagnetic flowmeter powered by battery, it is characterized in that on described single-chip microcomputer (29), being connected with display unit (35) and input block (34).
6. according to claim 1 or 2 or 3 or 4 described electromagnetic flowmeter powered by battery, it is characterized in that comprising electrode A electrode B, and ground-electrode C at described electrode assemblie.
7. electromagnetic flowmeter powered by battery according to claim 5 is characterized in that comprising electrode A at described electrode assemblie, electrode B, and ground-electrode C.
8. electromagnetic flowmeter powered by battery according to claim 6 is characterized in that at described electrode assemblie be detachable blade formula electrode assemblie; Comprise electrode scraper (2), be sheathed on the signal electrode (1) in it, the electrode scraper is matched by electrode tip holder (3) and measuring tube (19), described electrode scraper (2) periphery is provided with thread-changing sheet (6), the thread-changing sheet is fixed on the electrode tip holder (3) by the gland nut (8) that is sheathed on the electrode scraper (2), is provided with stop nut (9) at the end of electrode scraper (2); The electrode wires (18) of described thread-changing sheet (6) is passed sealed tube (10) and is linked to each other with peripheral circuit; On described sealed tube (10), be provided with gland bonnet (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100499434A CN100417919C (en) | 2005-06-03 | 2005-06-03 | Electromagnetic flowmeter powered by battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100499434A CN100417919C (en) | 2005-06-03 | 2005-06-03 | Electromagnetic flowmeter powered by battery |
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| Publication Number | Publication Date |
|---|---|
| CN1873380A true CN1873380A (en) | 2006-12-06 |
| CN100417919C CN100417919C (en) | 2008-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100499434A Expired - Fee Related CN100417919C (en) | 2005-06-03 | 2005-06-03 | Electromagnetic flowmeter powered by battery |
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| CN (1) | CN100417919C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332549A (en) * | 2010-07-05 | 2012-01-25 | 株式会社山武 | Field device with internal battery |
| CN104048711A (en) * | 2014-07-04 | 2014-09-17 | 威海市天罡仪表股份有限公司 | Electromagnetic field multi-level strength switching circuit and electromagnetic field multi-level strength switching calculation method |
| CN104266695A (en) * | 2014-10-22 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Battery-powered electromagnetic flow meter |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4784000A (en) * | 1987-01-15 | 1988-11-15 | Emerson Electric Co. | Magnetic flowmeter coil driver and method |
| JP2545664B2 (en) * | 1991-11-20 | 1996-10-23 | 山武ハネウエル株式会社 | Electromagnetic flow meter |
| GB2332527B (en) * | 1997-12-19 | 2002-10-30 | Abb Kent Taylor Ltd | Electromagnetic flowmeter |
| JP2003315121A (en) * | 2002-04-18 | 2003-11-06 | Yamatake Corp | Electromagnetic flowmeter |
| CN2558965Y (en) * | 2002-07-24 | 2003-07-02 | 陈宝荣 | Dismountable scraper type intelligent electromagnetic flowmeter |
| JP2004069630A (en) * | 2002-08-09 | 2004-03-04 | Yokogawa Electric Corp | Excitation circuit of electromagnetic flowmeter |
-
2005
- 2005-06-03 CN CNB2005100499434A patent/CN100417919C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332549A (en) * | 2010-07-05 | 2012-01-25 | 株式会社山武 | Field device with internal battery |
| CN104048711A (en) * | 2014-07-04 | 2014-09-17 | 威海市天罡仪表股份有限公司 | Electromagnetic field multi-level strength switching circuit and electromagnetic field multi-level strength switching calculation method |
| CN104048711B (en) * | 2014-07-04 | 2017-07-18 | 威海市天罡仪表股份有限公司 | Electromagnetic field multi-level intensity switching circuit and its switching computational methods |
| CN104266695A (en) * | 2014-10-22 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Battery-powered electromagnetic flow meter |
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| Publication number | Publication date |
|---|---|
| CN100417919C (en) | 2008-09-10 |
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