CN204007736U - A kind of electromagnetic flowmeter - Google Patents
A kind of electromagnetic flowmeter Download PDFInfo
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- CN204007736U CN204007736U CN201420365693.XU CN201420365693U CN204007736U CN 204007736 U CN204007736 U CN 204007736U CN 201420365693 U CN201420365693 U CN 201420365693U CN 204007736 U CN204007736 U CN 204007736U
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- 230000002159 abnormal effect Effects 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
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- 230000032683 aging Effects 0.000 description 2
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Abstract
The utility model provides a kind of electromagnetic flowmeter.This electromagnetic flowmeter can comprise: first passage, comprises the first coil and the second coil and the first electrode and the second electrode; Second channel, comprises tertiary coil and the 4th coil and third electrode and the 4th electrode; And switch selection circuit, for selecting first passage or second channel, to work on selected passage.
Description
Technical field
The utility model relates generally to commercial measurement field, particularly, relates to a kind of electromagnetic flowmeter.
Background technology
Electromagnetic flowmeter is the flowmeter that carries out flow measurement according to Faraday's electromagnetic induction law, it is by measure the induction electromotive force producing when conductive fluid is made cutting magnetic line in magnetic field on the electrode on pipeline both sides, thereby in computer tube, the flow velocity of conductive fluid is determined flow.Due to its unique advantage, electromagnetic flowmeter is applied to the flow measurement of various conducting liquids in industrial process at present widely.
Existing Design of Electromagnetic Flowmeter has single passage, and this passage is made up of a pair of field coil and a pair of detecting electrode.After electromagnetic flowmeter work a period of time, because coil, electrode etc. are aging or damage, the signal of electromagnetic flowmeter survey becomes inaccurate.In addition, if having in electromagnetic flowmeter that non-full pipe is abnormal, local interference, electrode incrustation etc. are abnormal, the flow velocity signal that electromagnetic flowmeter can output distortion.Moreover, if the passage of electromagnetic flowmeter open circuit or short circuit, electromagnetic flowmeter cisco unity malfunction.
Utility model content
The purpose of this utility model is to provide a kind of electromagnetic flowmeter, and it can solve one or more in the problems referred to above of prior art.
An aspect of the present utility model provides a kind of electromagnetic flowmeter, and it can comprise: first passage, can comprise the first coil and the second coil and the first electrode and the second electrode; Second channel, can comprise tertiary coil and the 4th coil and third electrode and the 4th electrode; And switch selection circuit, can be for selecting first passage or second channel, to work on selected passage.
According to an embodiment, the magnetic direction that the first coil in first passage and the second coil and the first electrode and the second electrode produce can be arranged such that by the first coil and the second coil electricity time is that the electromotive force direction between first direction and the first electrode and the second electrode is the second direction vertical with first direction; And the magnetic direction that the tertiary coil in second channel and the 4th coil and third electrode and the 4th electrode produce can be arranged such that by tertiary coil and the 4th coil electricity time is that the electromotive force direction between second direction and third electrode and the 4th electrode is first direction.
According to another embodiment, this electromagnetic flowmeter can also comprise comparator circuit, when when this comparator circuit can be measured according to electromagnetic flowmeter on selected first passage, the measured value of gained and electromagnetic flowmeter are measured on selected second channel the measured value of gained between difference, thereby compare and judge that to have the precision of passage of less meter constant variable quantity higher by the meter constant variable quantity of the meter constant variable quantity to first passage and second channel, and make switch select circuit to be chosen on the passage that precision is higher to work.
According to another embodiment, this electromagnetic flowmeter can also comprise abnormal detection circuit, this abnormal detection circuit can be by detecting respectively resistance and the electromotive force between two electrodes in resistance and electromotive force and the selected second channel between two electrodes in selected first passage, judge abnormal in first passage and second channel, and make switch select circuit to be chosen on the passage of the no exceptions in first passage and second channel to work.
According to another embodiment, the first coil, the second coil, tertiary coil and the 4th coil can be saddle coil.
According to another embodiment, the first coil, the second coil, tertiary coil and the 4th coil can be toroid winding.
Application the utility model, owing to there being two passages of first passage and second channel in electromagnetic flowmeter, therefore can work by being relatively chosen on the passage with degree of precision of first passage and second channel; In the case of judge in first passage and second channel one occur abnormal, be chosen on the passage of another no exceptions in first passage and second channel and work, thereby improved the job stability of electromagnetic flowmeter.
By the detailed description to preferred embodiment of the present utility model below in conjunction with accompanying drawing, these and other advantage of the present utility model will be more obvious.
Brief description of the drawings
In order further to set forth above and other advantage of the present utility model and feature, below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.Described accompanying drawing comprises in this manual and forms the part of this instructions together with detailed description below.Wherein, in institute's drawings attached, used same or analogous Reference numeral to represent identical or similar parts.Should be appreciated that these accompanying drawings only describe typical case of the present utility model, and should not regard the restriction to scope of the present utility model as.In the accompanying drawings:
Fig. 1 is the block diagram illustrating according to the structure of the electromagnetic flowmeter of an embodiment of the present utility model;
Fig. 2 is the block diagram illustrating according to the structure of the electromagnetic flowmeter that comprises comparator circuit of another embodiment of the present utility model; And
Fig. 3 is the block diagram illustrating according to the structure of the electromagnetic flowmeter that comprises abnormal detection circuit of another embodiment of the present utility model.
Embodiment
Embodiment of the present utility model is described with reference to the accompanying drawings.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted with the utility model irrelevant, expression and the description of parts well known by persons skilled in the art and processing.
Fig. 1 is the block diagram illustrating according to the structure of the electromagnetic flowmeter 100 of an embodiment of the present utility model.
As shown in fig. 1, electromagnetic flowmeter 100 can comprise: first passage, second channel, switch are selected circuit 101 and process chip and other circuit 102.Below each part is elaborated.
First passage can comprise coil 1 and coil 2 and electrode c and electrode d.Second channel can comprise coil 3 and coil 4 and electrode a and electrode b.First passage and second channel are all connected to switch and select circuit 101, in Fig. 1, dot coil 1, coil 2, coil 3 and coil 4 and select the annexation of circuit 101 with switch, and represent the annexation of electrode a, electrode b, electrode c and electrode d and switch selection circuit 101 with solid line.First passage and second channel can not be worked simultaneously, and switch selects circuit 101 within certain time, can only select a passage job in first passage and second channel.First passage and second channel can select circuit 101 to be connected to process chip and other circuit 102 by switch, and first passage and second channel can select circuit 101 to share process chip and other circuit 102 by switch.
Switch selection circuit 101 can be for selecting first passage or second channel, to work on selected passage.It can be transistor switching circuit, FET switch circuit, touch switch circuit, one-key switch circuit, light-controlled switching circuit, photoswitch circuit etc. that switch is selected circuit 101.Switch select circuit 101 can be manually or the mode of program setting select first passage or second channel.
Process chip and other circuit 102 can comprise the (not shown)s such as field circuit, data processing circuit, display circuit.Field circuit can be used for to coil electricity to produce magnetic field.Data processing circuit can be used for the flow velocity signal measuring to amplify, and converts the standard electric signal output being directly proportional to flow velocity signal to.Display circuit can be used for above-said current signal to show.
According to an embodiment, as shown in Figure 1, the magnetic direction producing when the coil 1 in first passage and coil 2 and electrode c and electrode d can be arranged such that to be switched on by coil 1 and coil 2 be electromotive force direction between vertical direction and electrode c and the electrode d in figure be with figure in horizontal direction.In addition, as shown in Figure 1, the magnetic direction producing when the coil 3 in second channel and coil 4 and electrode a and electrode b can be arranged such that to be switched on by coil 3 and coil 4 is that the electromotive force direction between horizontal direction and electrode a and electrode b is vertical direction.
Fig. 2 is the block diagram illustrating according to the structure of the electromagnetic flowmeter that comprises comparator circuit 203 200 of another embodiment of the present utility model.Fig. 2 and Fig. 1 difference are only comparator circuit 203, omit the description to its repeating part here.
In real work, before using electromagnetic flowmeter survey flow velocity, need first to determine the meter constant k of electromagnetic flowmeter, this meter constant k be in the process of constant flow rate that makes fluid, determine or can according to below the coefficient that calculates of formula (1):
k＝E/(B*L*V) (1)
Wherein, k is meter constant;
E is the induction electromotive force of electrode;
B is magnetic induction intensity;
L is the internal diameter of measuring tube; And
V is the flow velocity of fluid.
From formula (1), meter constant k is relevant with electromagnetic flowmeter self structure (comprising the position such as coil, electrode and shape).
After electromagnetic flowmeter work a period of time, because coil, electrode etc. are aging or damage, meter constant k can change, if now continue to calculate flow velocity by initial meter constant k 0, measuring-signal is inaccurate.
In order to measure more accurately flow velocity, in the electromagnetic flowmeter 200 of the present embodiment, can after work a period of time, select the passage in first passage and second channel with less meter constant variable quantity to carry out work by testing process.
As shown in Figure 2, electromagnetic flowmeter 200 can comprise comparator circuit 203, when when this comparator circuit 203 can be used for measuring on selected first passage according to electromagnetic flowmeter, the measured value of gained and electromagnetic flowmeter are measured on selected second channel the measured value of gained between difference, meter constant variable quantity by the meter constant variable quantity to first passage and second channel compares, thereby the precision of judging the passage with less meter constant variable quantity is higher, and make switch select circuit 101 to be chosen on the passage that precision is higher and to work.
Particularly, when first comparator circuit 203 is for example measured electromagnetic flowmeter and measured on first passage, the measured value of gained (for example, flow), then when measuring electromagnetic flowmeter and measuring on second channel, the measured value of gained (for example, flow), if the difference when measured value of gained and electromagnetic flowmeter are measured on second channel while measurement between the measured value of gained is greater than predetermined threshold, judge that one of first passage and second channel have occurred extremely on first passage.
Afterwards, comparator circuit 203 compares to judge that by the meter constant variable quantity of the meter constant variable quantity to first passage and second channel the precision of the passage with less meter constant variable quantity is higher, works thereby make switch select circuit 101 to be chosen on the passage that precision is higher.
The meter constant variable quantity of first passage is as shown in formula (2):
△k1＝(k1’-k1)/k1 (2)
Wherein, k1 is initial meter constant initial, first passage;
K1 ' is work meter constant after work a period of time, first passage;
In addition, k1 and k1 ' are in the time only having first passage work, determine in said process, according to formula (1).
The meter constant variable quantity of second channel is as shown in formula (3):
△k2＝(k2’-k2)/k2 (3)
Wherein, k2 is initial meter constant initial, second channel;
K2 ' is work meter constant after work a period of time, second channel;
In addition, k2 and k2 ' are in the time only having second channel work, determine in said process, according to formula (1).
The work meter constant variable quantity of passage is less, and the performance when meaning the performance of this passage and initially using is more approaching, and the flow velocity that also uses this channel measurement to obtain is more accurate.
Therefore,, in electromagnetic flowmeter 200, if comparator circuit 203 is less by relatively determining the meter constant variable quantity △ k1 of first passage, make switch select circuit 101 to select first passage to carry out work; If comparator circuit 203 is less by relatively determining the meter constant variable quantity △ k2 of second channel, make switch select circuit 101 to select second channel to carry out work; The accuracy of measurement of electromagnetic flowmeter can be provided so greatly.
Fig. 3 is the block diagram illustrating according to the structure of the electromagnetic flowmeter that comprises abnormal detection circuit 304 300 of another embodiment of the present utility model.Fig. 3 and Fig. 1 difference are only abnormal detection circuit 304, omit the description to its repeating part here.
In existing single channel electromagnetic flowmeter, if having in electromagnetic flowmeter that non-full pipe is abnormal, local interference, electrode incrustation etc. are abnormal, the flow velocity signal that electromagnetic flowmeter can output distortion.In addition, if electromagnetic flowmeter open circuit or short circuit, electromagnetic flowmeter cisco unity malfunction.
And in the electromagnetic flowmeter 300 of the present embodiment, can be by detecting respectively the abnormal of first passage and second channel, be chosen on the passage of no exceptions and work, this can improve the functional reliability of electromagnetic flowmeter greatly.
As shown in Figure 3, electromagnetic flowmeter 300 can comprise abnormal detection circuit 304, this abnormal detection circuit 304 can be by detecting respectively resistance and the electromotive force between two electrodes in resistance and electromotive force and the selected second channel between two electrodes in selected first passage, judge abnormal in first passage and second channel, and make switch select circuit 101 to be chosen on the passage of the no exceptions in first passage and second channel to work.
Particularly, when in the time only having first passage work, abnormal detection circuit 304 checks that resistance between two electrodes in first passage and electromotive force judge the abnormal of first passage at set intervals, if detect that first passage is abnormal, make switch select circuit 101 to be chosen on second channel and work; In addition, when in the time only having second channel work, abnormal detection circuit 304 checks that resistance between two electrodes in second channel and electromotive force judge the abnormal of second channel at set intervals, if detect that second channel is abnormal, make switch select circuit 101 to be chosen on first passage and work; Can ensure like this in first passage and second channel one occur abnormal, on another passage of the no exceptions that electromagnetic flowmeter can be in first passage and second channel, work, can greatly improve the reliability of electromagnetic flowmeter.
In addition, it should be noted that, although illustrated in Fig. 2 and Fig. 3 and added respectively above-mentioned comparator circuit 203 and abnormal detection circuit 304 in electromagnetic flowmeter 100, but it will be understood by those skilled in the art that electromagnetic flowmeter 100 can comprise the combination in any of above-mentioned comparator circuit 203 and abnormal detection circuit 304.
In addition, according to an embodiment, coil 1, coil 2, coil 3 and coil 4 can be saddle coil, by switching on to coil 1 and coil 2, set up one perpendicular to body and perpendicular to the magnetic field of the electromotive force direction between electrode c and electrode d; In addition, by switching on to coil 3 and coil 4, set up one perpendicular to body and perpendicular to the magnetic field of the electromotive force direction between electrode a and electrode b.
In addition, according to another embodiment, coil 1, coil 2, coil 3 and coil 4 can be toroid winding, by switching on to coil 1 and coil 2, set up one perpendicular to body and perpendicular to the magnetic field of the electromotive force direction between electrode c and electrode d; In addition, by switching on to coil 3 and coil 4, set up one perpendicular to body and perpendicular to the magnetic field of the electromotive force direction between electrode a and electrode b.
Finally, also it should be noted that, unless context is clearly pointed out as other situation, otherwise in whole instructionss and claim, should, with the meaning of containing property, that is to say, with " including, but not limited to " meaning, explain that word " comprises ", " comprising " etc.
In instructions above, with reference to specific embodiment, the utility model is described.But those of ordinary skill in the art's understanding can be carried out various amendments and change under the prerequisite that does not depart from the scope of the present utility model limiting as claims.
Claims (6)
1. an electromagnetic flowmeter (100,200,300), is characterized in that comprising:
First passage, comprises the first coil (1) and the second coil (2) and the first electrode (c) and the second electrode (d);
Second channel, comprises tertiary coil (3) and the 4th coil (4) and third electrode (a) and the 4th electrode (b); And
Switch is selected circuit (101), for selecting described first passage or described second channel, to work on selected passage.
2. electromagnetic flowmeter according to claim 1 (100,200,300), is characterized in that,
The magnetic direction that described the first coil (1) in described first passage and described the second coil (2) and described the first electrode (c) and described the second electrode (d) produce while being arranged such that by described the first coil (1) and described the second coil (2) energising is that the electromotive force direction between first direction and described the first electrode (c) and described the second electrode (d) is the second direction vertical with first direction; And
The magnetic direction that described tertiary coil (3) in described second channel and described the 4th coil (4) and described third electrode (a) and described the 4th electrode (b) produce while being arranged such that by described tertiary coil (3) and described the 4th coil (4) energising is that the electromotive force direction between described second direction and described third electrode (a) and described the 4th electrode (b) is described first direction.
3. electromagnetic flowmeter (100 according to claim 1 and 2, 200, 300), it is characterized in that described electromagnetic flowmeter (100, 200, 300) also comprise comparator circuit (203), when when described comparator circuit (203) is measured on selected first passage according to described electromagnetic flowmeter, the measured value of gained and described electromagnetic flowmeter are measured on selected second channel the measured value of gained between difference, meter constant variable quantity by the meter constant variable quantity to described first passage and described second channel compares, thereby the precision of judging the passage with less meter constant variable quantity is higher, and make described switch select circuit (101) to be chosen on the passage that described precision is higher to work.
4. electromagnetic flowmeter (100 according to claim 1 and 2, 200, 300), it is characterized in that described electromagnetic flowmeter (100, 200, 300) also comprise abnormal detection circuit (304), described abnormal detection circuit (304) is by detecting respectively resistance and the electromotive force between two electrodes in selected first passage, and resistance and electromotive force between two electrodes in selected second channel, judge abnormal in described first passage and described second channel, and make described switch select circuit (101) to be chosen on the passage of the no exceptions in described first passage and described second channel to work.
5. electromagnetic flowmeter according to claim 1 and 2 (100,200,300), is characterized in that described the first coil (1), described the second coil (2), described tertiary coil (3) and described the 4th coil (4) are saddle coil.
6. electromagnetic flowmeter according to claim 1 and 2 (100,200,300), is characterized in that described the first coil (1), described the second coil (2), described tertiary coil (3) and described the 4th coil (4) are toroid winding.
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| CN201420365693.XU CN204007736U (en) | 2014-07-02 | 2014-07-02 | A kind of electromagnetic flowmeter |
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| CN201420365693.XU CN204007736U (en) | 2014-07-02 | 2014-07-02 | A kind of electromagnetic flowmeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109115286A (en) * | 2018-08-03 | 2019-01-01 | 燕山大学 | Double groups of magnet exciting coil multi-electrode flowmeter sensor based on electromagnetic correlation method |
| CN110945324A (en) * | 2017-05-11 | 2020-03-31 | Abb瑞士股份有限公司 | Method and system for configuring an electromagnetic flowmeter |
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2014
- 2014-07-02 CN CN201420365693.XU patent/CN204007736U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110945324A (en) * | 2017-05-11 | 2020-03-31 | Abb瑞士股份有限公司 | Method and system for configuring an electromagnetic flowmeter |
| CN110945324B (en) * | 2017-05-11 | 2021-07-02 | Abb瑞士股份有限公司 | Method and system for configuring an electromagnetic flowmeter |
| CN109115286A (en) * | 2018-08-03 | 2019-01-01 | 燕山大学 | Double groups of magnet exciting coil multi-electrode flowmeter sensor based on electromagnetic correlation method |
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