CN201876279U - Non-full-tube electromagnetic flow meter - Google Patents
Non-full-tube electromagnetic flow meter Download PDFInfo
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- CN201876279U CN201876279U CN2010206222987U CN201020622298U CN201876279U CN 201876279 U CN201876279 U CN 201876279U CN 2010206222987 U CN2010206222987 U CN 2010206222987U CN 201020622298 U CN201020622298 U CN 201020622298U CN 201876279 U CN201876279 U CN 201876279U
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- measuring channel
- described electrode
- field coil
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- electrode
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Abstract
The utility model discloses a non-full-tube electromagnetic flow meter, which comprises a measuring pipeline, an upper exciting coil and a lower exciting coil, wherein the upper exciting coil is arranged above the inner wall of the measuring pipeline; the lower exciting coil is arranged below the inner wall of the measuring pipeline; both sides of the lower exciting coil on the lower half circumference of the inner wall of the measuring pipeline are provided with 2 to 5 pairs of electrodes; and each pair of electrodes is arranged on both sides of the lower exciting coil and has the same height. The utility model the advantages that: the non-full-tube electromagnetic flow meter has a wide measuring range, can be used for measuring fluid flow of 0.05D liquid level in minimum, and has the accuracy of higher than grade I.
Description
Technical field
The utility model relates to a kind of electromagnetic flowmeter instrument, particularly discloses a kind of non-full pipe electromagnetic flowmeter.
Background technology
Electromagnetic flowmeter has been used to measure the full packages flow always since commercialization the 1950's, up to phase early 1990s, and Fei Shibote (Fischer﹠amp; Porter) company has at first developed non-full pipe electromagnetic flowmeter (EMF).This instrument is made up of two parts, and one is mounted in the sensor on the pipeline, and the 2nd, by the converter of microprocessor control, can indicate on the spot, but teletransmission shows and control again.From in appearance, what is not different with common non-full pipe electromagnetic flowmeter (EMF) for it, have advantages such as minimum, linear output of no movable member, no choked flow piece, crushing and rangeability be wide equally, solved a lot of large diameter pipeline fluids not full packages be difficult to measure the difficult problem of flow.But, in use, found its limitation equally, for example can only measuring channel in liquid level be higher than the flow of 0.1D, when liquid level is lower than this height, promptly can't detect.The non-full pipe electromagnetic flowmeter only is applicable to circular pipe present stage in addition, is not suitable for special shape pipelines such as rectangular tube.
Summary of the invention
The purpose of this utility model is to overcome the defective that exists in the prior art, provides a kind of measurement range non-full pipe electromagnetic flowmeter big, simple in structure.
The utility model is achieved in that a kind of non-full pipe electromagnetic flowmeter, comprise measuring channel, be installed in measuring channel inwall last field coil and following field coil up and down, it is characterized in that: the following field coil both sides on second circumference of described measuring channel inwall are provided with 2～5 pairs of electrodes, and every pair of electrode branch is in the both sides of descending field coil and highly identical.
Following field coil both sides on second circumference of described measuring channel inwall are provided with 4 pairs of electrodes, and described electrode is arranged downwards from measuring channel inwall center, is followed successively by E
1, E
2, E
3, E
4, described electrode E
1The centre position that is positioned at measuring channel is that 50% of measuring channel diameter is highly located described electrode E
2Be positioned at 30% ± 2% of measuring channel diameter and highly locate described electrode E
3Be positioned at 15% ± 2% of measuring channel diameter and highly locate described electrode E
4Being positioned at 5% ± 2% of measuring channel diameter highly locates.
Following field coil both sides on second circumference of described measuring channel inwall are provided with 3 pairs of electrodes, and described electrode is arranged downwards from measuring channel inwall center, is followed successively by E
1, E
2, E
3, described electrode E
2Be positioned at 25% ± 2% of measuring channel diameter and highly locate described electrode E
3Being positioned at 5% ± 2% of measuring channel diameter highly locates.
Following field coil both sides on second circumference of described measuring channel inwall are provided with 5 pairs of electrodes, and described electrode is arranged downwards from measuring channel inwall center, is followed successively by E
1, E
2, E
3, E
4, E
5, described electrode E
2Be positioned at 35% ± 2% of measuring channel diameter and highly locate described electrode E
3Be positioned at 25% ± 2% of measuring channel diameter and highly locate described electrode E
4Be positioned at 15% ± 2% of measuring channel diameter and highly locate described electrode E
5Being positioned at 5% ± 2% of measuring channel diameter highly locates.
The beneficial effects of the utility model are: measurement range is wide, the fluid flow of MDA 0.05D liquid level; The precision height is better than 1 class precision.
Description of drawings
Fig. 1 is the structural representation of the utility model when being operated in the series excitation pattern.
Fig. 2 is the structural representation of the utility model when being operated in anti-energizing mode.
Among the figure: 1, measuring channel; 2, go up field coil; 3, following field coil; 4, E
15, E
26, E
37, E
4
Embodiment
According to Fig. 1, Fig. 2, the utility model comprises measuring channel 1, is installed in measuring channel 1 inwall last field coil 2 and following field coil 3 up and down, following field coil 3 both sides on second circumference of described measuring channel 1 inwall are provided with 2～5 pairs of electrodes, number of electrodes in this embodiment be 4 pairs as Fig. 1, Fig. 2, the every pair of electrode branch is in the both sides of field coil down and highly identical.Described 4 pairs of electrodes are arranged downwards from measuring channel 1 inwall center, are followed successively by electrode E
14, E
25, E
36, E
47, described electrode E
14 centre positions that are positioned at measuring channel 1 are that 50% of measuring channel diameter is highly located described electrode E
25 are positioned at 30% of measuring channel 1 diameter highly locates described electrode E
36 are positioned at 15% of measuring channel 1 diameter highly locates described electrode E
47 are positioned at 5% of measuring channel 1 diameter highly locates.
When the utility model is operated in the series excitation pattern, as shown in Figure 1.If when establishing full-section pipe-flow, electrode E
14 can produce an electromotive force e1.When the pipeline liquid level descends, electric potential signal e1 will increase with respect to the isodose flow.When liquid level dropped to 50%, electric potential signal e1 reached maximal value.When liquid level is lower than 50%, electrode E
14 will not detect electric potential signal so ineffective.In like manner, electrode E
25, E
36 and E
4Electric potential signal on 7 is careless liquid level variation and changing also.Electrode E
47 minimum 5% liquid levels of surveying.
Therefore, during the series excitation pattern, signal that sensor provides has comprised the signal of velocity in pipes.According to formula:
e=KBDV
Can know velocity in pipes how much.
When working sensor during at anti-energizing mode, as shown in Figure 2.Because last field coil 2 and following field coil 3 are oppositely excitatory, when fluid was full of measuring channel 1, Distribution of Magnetic Field and flow distribution all were symmetrical, so electrode E
1The electric potential signal that obtains on 4 is " 0 ".When liquid level descended, because the decline of liquid level, the pipe internal upper part divided fluid that the contribution of electric potential signal is reduced, and the lower part remains unchanged, so obtain electrode E
14 electric potential signal is not 0.As low more, the measured E of the liquid level of tube fluid
14 electric potential signal is just big more.In like manner can be applicable to electrode E
25, E
36 and E
4The variation of the electric potential signal on 7.
Therefore, during anti-energizing mode, signal that sensor provides has comprised the signal of intraluminal fluid face height.According to formula: e=KBDV
1, when the intraluminal fluid face more than or equal to 50% the height, e=e
Down-e
On=B(S
Down-S
On) D
50%V, wherein e
On, e
DownThe interior top and the bottom of expression pipe fluid is to E respectively
1The contribution of 4 electric potential signal;
Wherein the bow-shaped area computing formula is:
Wherein D is the diameter of measuring channel 1, and h is the fluid level height in the measuring channel 1;
2, when the intraluminal fluid face more than or equal to 30%, less than 50% o'clock, e=e
Down=BS
DownD
35%V;
3, when the intraluminal fluid face more than or equal to 15%, less than 30% o'clock, e=e
Down=BS
DownD
20%V;
4, when the intraluminal fluid face more than or equal to 5%, less than 15% o'clock, e=e
Down=BS
DownD
10%V;
5, when the intraluminal fluid face is lower than 50%, in the formula
D is a distance between potential electrode.
The utility model is by phase phasic difference 90
0The square wave series excitation of controlling upper and lower excitation swash with anti-, thereby record flow velocity and liquid level.
Traditional non-full pipe electromagnetic flowmeter only is applicable to circular pipe, and the utility model can be applied to square and circular pipe simultaneously.Traditional non-full pipe electromagnetic flowmeter is minimum can only survey 10% liquid level, and the utility model can measure 5% liquid level.
Claims (4)
1. non-full pipe electromagnetic flowmeter, comprise measuring channel, be installed in measuring channel inwall last field coil and following field coil up and down, it is characterized in that: the following field coil both sides on second circumference of described measuring channel inwall are provided with 2～5 pairs of electrodes, and every pair of electrode branch is in the both sides of descending field coil and highly identical.
2. according to the described non-full pipe electromagnetic flowmeter of claim 1, it is characterized in that: the following field coil both sides on second circumference of described measuring channel inwall are provided with 4 pairs of electrodes, and described electrode is arranged downwards from measuring channel inwall center, is followed successively by E
1, E
2, E
3, E
4, described electrode E
2Be positioned at 30% ± 2% of measuring channel diameter and highly locate described electrode E
3Be positioned at 15% ± 2% of measuring channel diameter and highly locate described electrode E
4Being positioned at 5% ± 2% of measuring channel diameter highly locates.
3. according to the described non-full pipe electromagnetic flowmeter of claim 2, it is characterized in that: the following field coil both sides on second circumference of described measuring channel inwall are provided with 3 pairs of electrodes, and described electrode is arranged downwards from measuring channel inwall center, is followed successively by E
1, E
2, E
3, described electrode E
2Be positioned at 25% ± 2% of measuring channel diameter and highly locate described electrode E
3Being positioned at 5% ± 2% of measuring channel diameter highly locates.
4. according to the described non-full pipe electromagnetic flowmeter of claim 2, it is characterized in that: the following field coil both sides on second circumference of described measuring channel inwall are provided with 5 pairs of electrodes, and described electrode is arranged downwards from measuring channel inwall center, is followed successively by E
1, E
2, E
3, E
4, E
5, described electrode E
2Be positioned at 35% ± 2% of measuring channel diameter and highly locate described electrode E
3Be positioned at 25% ± 2% of measuring channel diameter and highly locate described electrode E
4Be positioned at 15% ± 2% of measuring channel diameter and highly locate described electrode E
5Being positioned at 5% ± 2% of measuring channel diameter highly locates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206222987U CN201876279U (en) | 2010-11-24 | 2010-11-24 | Non-full-tube electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206222987U CN201876279U (en) | 2010-11-24 | 2010-11-24 | Non-full-tube electromagnetic flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201876279U true CN201876279U (en) | 2011-06-22 |
Family
ID=44164195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206222987U Expired - Fee Related CN201876279U (en) | 2010-11-24 | 2010-11-24 | Non-full-tube electromagnetic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201876279U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575344A (en) * | 2013-10-12 | 2014-02-12 | 苏州赛斯德工程设备有限公司 | Electromagnetic flowmeter capable of accurately measuring |
-
2010
- 2010-11-24 CN CN2010206222987U patent/CN201876279U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575344A (en) * | 2013-10-12 | 2014-02-12 | 苏州赛斯德工程设备有限公司 | Electromagnetic flowmeter capable of accurately measuring |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20111124 |