CN100425953C - External drum internal target rod flow sensor - Google Patents
External drum internal target rod flow sensor Download PDFInfo
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- CN100425953C CN100425953C CNB2006101632678A CN200610163267A CN100425953C CN 100425953 C CN100425953 C CN 100425953C CN B2006101632678 A CNB2006101632678 A CN B2006101632678A CN 200610163267 A CN200610163267 A CN 200610163267A CN 100425953 C CN100425953 C CN 100425953C
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- urceolus
- pressure
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- external drum
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Abstract
This invention disclosed a water flux sensor which consists of the following parts: the flux tube and press tube were fixed to the current pipe, the foil gage was stuck to the upper side of flux tube, the bar was fixed to the upper side of flux tube, the second foil gage was stuck to the press tube, the sensor chamber was fixed to the upper side of press tube. The invention can be applied to water pipe and some other kind of liquid pipeline.
Description
Technical field
The present invention relates to a kind of sensor of Fluid Computation flow, in particular, it relates to a kind of external drum internal target rod flow sensor that is mainly used on the water pipe.
Background technology
(1) target-type flow sensor
Consult Fig. 1, in the central authorities of water pipe, the flow path direction that meets water has a circular sheet, is fixed on the interior target bar.Interior target bar is held concurrently target lever fixing apparatus clamping in flow urceolus upper end in the semi-girder mode by sealing.
Paper tinsel formula foil gauge is posted in the appropriate location on interior target bar.When flowing water impact target sheet, the stressed bending of interior target bar, the size of bending strain is directly proportional with the flowing water impulsive force, measures the flow of water in view of the above.
This is a method the simplest.But how isolated foil gauge and current a difficult problem that runs in actual applications is, people have thought many measures: for example, fill silica gel or the like in overcoat corrugated tube, external application waterproof resin layer, the overcoat flexible pipe on foil gauge.These measures or because of serviceable life too short, or because of sensitivity and linear influence are surpassed standard, or because of zero point with reasons such as pressure and temperature move, all end in failure.These give the flowmeter user, and the flowmeter producer and sensor supplier have caused very big loss, have also influenced the progressive speed of national water resources management.
(2) turbine flow transducer
Under the impact of flowing water, the turbine rotation.The flow velocity of water is high more, and it is fast more that turbine rotates.On its each blade little magnet steel is housed, when it passes through fixing Hall element, just produces an electric pulse.Umber of pulse is many more in unit interval, and flow velocity is high more.
A twice difficult problem has fettered its application.The flexible impurity of the first snarls turbine, and it two is that magnetic-particle is more lived the gap between turbine and the Hall element and made the turbine flow transducer cisco unity malfunction.
(3) ultrasonic flow meter
Ultrasonic flow meter based on the difference on the frequency method has higher precision in theory.But from use angle, must carry out the preliminary measurement and the compensation of numerous parameters, just might realize.Compensate manyly more, precision is high more, and its price is precipitous thereupon to raise up.Less important work before using is also more loaded down with trivial details.Not so, its precision is low and unstable.Energy consumption is also high.
Summary of the invention
Technical matters to be solved by this invention is to overcome the water logging foil gauge that exists in the prior art to cause failure of insulation and make sensor reliability and serviceable life reduce, install, debugging, the flow that the workload of operation and maintenance is big, produce because of the pressure and temperature of water moves, has the race word phenomenon and the high shortcoming of price of pressing when not having stream zero point, and a kind of cheap external drum internal target rod flow sensor of being convenient to maintain of better effects if is provided
Consult Fig. 2, for solving the problems of the technologies described above, the present invention adopts following technical scheme to be achieved.It comprises target bar in the power transmission, power induced current amount urceolus, the target sheet, target lever fixing apparatus in first foil gauge and sealing are held concurrently, successively be fixed on water pipe on by water (flow) direction power induced current amount urceolus and pressure urceolus, first foil gauge is attached to the upper end of power induced current amount urceolus, and the interior target bar of power transmission that is fixed with the target sheet is fixed on the upper end of power induced current amount urceolus; Second foil gauge divides on the two-layer up and down outer tube wall that is attached to the pressure urceolus along the stack shell of pressure urceolus, the transducer room that is equipped with temperature sensor is fixed on the upper end of pressure urceolus.
Power induced current amount urceolus described in the technical scheme and pressure urceolus are two and are processed into the thin cylinder of power primary element by rustproof spring steel that wall thickness is 0.3 millimeter-0.55 millimeter; The distortion of target bar is in 100 microstrains (μ ε) in the described power transmission, and diameter is between 8 millimeters to 30 millimeters; Each two upper ends that are attached to power induced current amount urceolus symmetrically about described foil gauge, four foil gauges are connected into the full-bridge form, and two foil gauges of homonymy are placed on the relative brachium pontis; Described foil gauge divides two-layer being attached on the pressure urceolus to be meant: circumferentially respectively paste the foil gauge that a slice is used as pressure survey on edge, symmetrical both sides, pressure urceolus middle part, circumferentially respectively paste the foil gauge that a slice is used as temperature compensation on edge, symmetry both sides, pressure urceolus top, four foil gauges also are connected into the full-bridge form, two foil gauges of measuring pressure are placed on the relative brachium pontis, and two foil gauges of temperature compensation are placed on another on the relative brachium pontis; Described temperature sensor is the bottom that places the transducer room inner chamber.
The invention has the beneficial effects as follows:
1. the present invention thoroughly solves the water logging foil gauge and causes sensor, and then the problem of whole flowmeter inefficacy, has eliminated the difficult point that target type meter is applied.
2. the relevant record of files on each of customers and measuring and calculating all show to have only one-year age the average life of the target-type flow sensor of corrugated tube sealing.Losing efficacy between the stage of replacement, and all bringing no small trouble for the flowmeter user and the producer, loss and burden.External drum internal target rod flow sensor does not have above-mentioned weak link fully, and will no longer be problem its serviceable life, only this, annual just can be the spending of 3000 yuan of flowmeter saving.
3. external drum internal target rod flow sensor is more convenient for maintaining and safeguarding.
4. external drum internal target rod flow sensor has kept the traditional advantage of target type meter low price when having improved precision.For this problem is described, the spy provides following " sexual valence contrast table ".
The sexual valence contrast table
Annotate: this table is represented quality with the height of score value: 10 minutes the highest, and 1 minute minimum.
Description of drawings
Fig. 1 is a water logging target-type flow sensor structural principle synoptic diagram;
Fig. 2 is an external drum internal target rod flow sensor structural principle synoptic diagram;
Among the figure: 1. water pipe, 2. target sheet, 3. in target bar, 4. foil gauge, 5. flow urceolus, 6. the double target lever fixing apparatus of sealing 7. seals hold concurrently transducer room stationary installation, 8. pressure urceolus, 9. foil gauge, 10. temperature sensor, 11. transducer rooms, target bar in 12. power transmissions, 13. power induced current amount urceolus.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
Consult Fig. 2, water pipe 1 is the pipeline of discharge to be measured, adopts the thin-walled power induced current amount urceolus 13 of rustproof spring steel and thin-wall pressure urceolus 8 to be fixed by bolts to water pipe 1 (plug-in type commonly used or the formula that clamps are installed in flow sensor on the pipeline of discharge to be measured) material that processes.Power induced current amount urceolus 13 and pressure urceolus 8 are power primary elements, wall thickness is 0.3 millimeter-0.55 millimeter, by it the pressure signal of water, the linear strain signal of barrel are passed to foil gauge 9 and foil gauge 4, the function of power induced current amount urceolus 13 is tangible different with flow urceolus of the prior art 5, and flow urceolus 5 does not play the power primary element.Four foil gauges 4 are posted on top at power induced current amount urceolus 13 symmetrically, about each two.Two tensions in the left side, two pressurizeds in the right.Four foil gauges are connected into the full-bridge form, and the foil gauge 4 of homonymy is placed on the relative brachium pontis, thereby form full stack output, the sensitivity that has increased sensor.Because pressure flow water is blocked on power induced current amount urceolus 13 inboards fully, thereby has thoroughly got rid of the possibility of water logging foil gauge.Be fixed with target sheet 2 in the lower end with the power transmission that sealing gasket is housed in the upper end in the sealing of target bar 12 usefulness hold concurrently target lever fixing apparatus 6 with the form clamping that is threaded upper end at power induced current amount urceolus 13.Though target bar 12 and interior target bar 3 shapes of the prior art are similar in the power transmission, are essentially different from structure and function, target bar 3 has certain rigidity in requiring in the prior art, produce certain deformation, wishes to produce 800 microstrains; Target bar 12 does not produce distortion in the power transmission and the present invention requires, to be delivered to the acting force of water on the power induced current amount urceolus 13 by target bar 12 in the power transmission completely target sheet 2, rigidity requirement height to target bar 12 in the power transmission, wish that distortion is in 100 microstrains, diameter is between 8 millimeters to 30 millimeters, therefore, in the design power transmission during target bar 12 no matter in physical dimension still in selection, all with consider in target bar 3 different.
, use along circumferentially respectively pasting a slice foil gauge 9 in symmetry both sides, pressure urceolus 8 middle parts as pressure survey; , use along circumferentially respectively pasting a slice foil gauge 9 in its symmetry both sides, top as temperature compensation.Four foil gauges 9 also are connected into the full-bridge form, and two of measuring pressure are placed on the relative brachium pontis, and two that use as temperature compensation are placed on another on the relative brachium pontis.In the bottom of transducer room 11, install a temperature sensor 10 additional, be used to measure the temperature of current.Transducer room 11 usefulness temperature sensor 10 and that sealing gasket is housed on ring flange sealing is housed holds concurrently transducer room stationary installation 7 with the form clamping that is threaded upper end at pressure urceolus 8.
Embodiment: one is the target type meter of core with the external drum internal target rod flow sensor, is installed on the water pipe 1 of discharge to be measured of test base.Caliber is 150 millimeters (referring to internal diameter), and target sheet 2 diameters are 41 millimeters, and target bar 12 length are 350 millimeters in the power transmission.Power induced current amount urceolus 13 and pressure urceolus 8 external diameters all are 25 millimeters, and wall thickness all is 0.4 millimeter.120 millimeters of power induced current amount urceolus 13 length, 80 millimeters of pressure urceolus 8 length.The bitubular is all made with rustproof spring steel, through thermal treatment, guarantees that it has better elastic.The paper tinsel formula foil gauge of selecting for use Hanzhong to produce, 1000 ohm of its nominal resistances, normal sensibility 1.8.Temperature sensor is AD590.
The calibration result relevant with pressure and temperature is as follows:
| The flow urceolus | The pressure urceolus | Annotate | |
| Sensitivity (MV/V) | 0.0021 | 0.0892 | Rated load 1Mpa |
| Matched curve | Straight line | Straight line | The pressure and temp compensation |
| Leading zero's (MV) | 0.0011 | 0.0014 | Do not have to press and do not have stream |
The calibration result relevant with flow is as follows:
| The flow urceolus | The pressure urceolus | Annotate | |
| Sensitivity (MV/V) | 1.453 | 0.0000 | Rated flow |
| Matched curve | Straight line | Straight line | |
| Leading zero's (MV) | 0.0011 | 0.0014 | Do not have to press and do not have stream |
A/D is the own AIN1 of F060 single-chip microcomputer, 16, and reference voltage 2.44V.The specified output number of design is 32768, thereby has guaranteed 100% overload capacity.Used AD620 before the A/D, its enlargement factor selects 168 for use.
This flowmeter is surveyed beginning till now from examination, 16 months.Both do not had the immersion sign, do not run word yet.Cut off the water and check twice, all are normal.
Examination survey front platform test accuracy of detection is installed is better than 0.6%.Three same ultrasonic flow meter comparisons of usefulness in examination is surveyed, indicating value differs average out to 4.1%.
External drum internal target rod flow sensor is demarcated and using method:
In the external drum internal target rod flow sensor use, owing to make the material homogeneity of external drum internal target rod flow sensor main parts size, paster technique and processing and manufacturing etc. have defective, no matter flow has or not, in water pressure and differing under the effect of demarcation condition temperature, the electric bridge of power induced current amount urceolus 13 all has output, and this output and flow output are superimposed.Produce following two problems thus.Output is arranged during first zero flow, and this output also the height with the size of pressure and temperature is relevant.Under the situation that does not have force value and temperature value reference, can't from total output, deduct with good groundsly, exist thereby demonstrated a certain flow value, this is the so-called race word phenomenon of pressing nothing stream that has.It two is when flow is arranged, and is superimposed with the composition that pressure and temperature causes in the flow indicating value, thereby has reduced the precision of sensor.Utilize pressure urceolus 8 can measure the numerical value of pressure exactly, utilize temperature sensor 10 can measure the numerical value of temperature exactly.
Two urceolus (power induced current amount urceolus 13 and pressure urceolus 8) are demarcated
For accurately deduction must be to the bitubular demarcation of being correlated with because the flow composition of pressure and temperature influence from the flow indicating value.Here assert that function is linear, be suitable for superposition principle.Usually, the pressure limit in the water pipe 1 is 0.0--2.0Mpa; The temperature range of current is 0--50 degree centigrade.In this interval, set 3 calibration points, simultaneously the bitubular is demarcated, set up the fitting function that interrelates.
Variable is provided with as follows:
The X1--temperature;
X2--pressure, Mpa;
X3--water is to the impulse force of target sheet 2, N;
The sampled value of the temperature of Y1--A/D, 0--65535;
The sampled value of the pressure of Y2--A/D, 0--65535;
The sampled value that the target sheet 2 of Y3--A/D is stressed, 0--65535.
The branch sampled value that only generates among the Y21--Y2 by temperature factor;
The branch sampled value that only generates among the Y22--Y2 by pressure factor;
The branch sampled value that only generates among the Y31--Y3 by temperature factor;
The branch sampled value that only generates among the Y32--Y3 by pressure factor;
The branch sampled value that only generates among the Y33--Y3 by the flow factor;
Constant is provided with as follows:
The ratio of Aij--linearity is determined in the calibration process;
The intercept of Bij--linearity is determined in the calibration process;
Comprehensive constant after C--calculates.
Calibration equation has three groups six, and they are:
Y1＝A11×X1+B11
Y2＝Y21+Y22＝(A21×X1+B21)+(A22×X2+B22)
Y3=Y31+Y32+Y33=(A31 * X1+B31)+(A32 * X2+B32)+(A33 * X3+B33) last can obtain following simple fitting function relation:
X3＝(Y3-C)/A33
In the formula: C=A31 * (Y1-B11)/A11+A32 * (Y2-A21 * (Y1-B11)/A11-B21-B22)+B31+B32+B33
Flow correction
When using external drum internal target rod flow sensor, what power induced current amount urceolus 13 was measured is integrated flow rate, comprising the composition because the flow of pressure factor and temperature factor influence superposes.Pressure urceolus 8 is measured pressure, and temperature sensor 10 is measured temperature, the fitting function that utilizes calibration process to provide, the concrete numerical value that converses so superpose.At last, from integrated flow rate, cut this numerical value, just obtained real flow.Certainly, this process all is to be carried out automatically by the target type meter that is core with the external drum internal target rod flow sensor.
External drum internal target rod flow sensor of the present invention is not only applicable to water pipe, is suitable for other fluid line, particularly free from corrosion fluid line yet.Therefore, the present invention is applied to other fluid line, on the particularly free from corrosion fluid line, the detection of carrying out fluid flow is all within protection scope of the present invention.
Claims (6)
1. external drum internal target rod flow sensor, comprise target bar (12) in the power transmission, power induced current amount urceolus (13), target sheet (2), target lever fixing apparatus (6) in first foil gauge (4) and sealing are held concurrently is characterized in that power induced current amount urceolus (13) is fixed on the water pipe (1) by water (flow) direction successively with pressure urceolus (8), first foil gauge (4) is attached to the upper end of power induced current amount urceolus (13), and the interior target bar (12) of power transmission that is fixed with target sheet (2) is fixed on the upper end of power induced current amount urceolus (13); Second foil gauge (9) divides on the two-layer up and down outer tube wall that is attached to pressure urceolus (8) along the stack shell of pressure urceolus (8), and the transducer room (11) that will be equipped with temperature sensor (10) is fixed on the upper end of pressure urceolus (8).
2. according to the described external drum internal target rod flow sensor of claim 1, it is characterized in that, described power induced current amount urceolus (13) and pressure urceolus (8) are two and are processed into the thin cylinder of power primary element by rustproof spring steel that wall thickness is 0.3 millimeter-0.55 millimeter.
3. according to the described external drum internal target rod flow sensor of claim 1, it is characterized in that target bar (12) distortion is in 100 microstrains in the described power transmission, diameter is between 8 millimeters to 30 millimeters.
4. according to the described external drum internal target rod flow sensor of claim 1, it is characterized in that, each two upper ends that are attached to power induced current amount urceolus (13) symmetrically about described first foil gauge (4), four first foil gauges (4) are connected into the full-bridge form, and two first foil gauges (4) of homonymy are placed on the relative brachium pontis.
5. according to the described external drum internal target rod flow sensor of claim 1, it is characterized in that, described second foil gauge (9) divides on the two-layer up and down outer tube wall that is attached to pressure urceolus (8) along the stack shell of pressure urceolus (8) and is meant: in symmetrical both sides, pressure urceolus (8) middle part along circumferentially respectively pasting second foil gauge (9) that a slice is used as pressure survey, circumferentially respectively paste second foil gauge (9) that a slice is used as temperature compensation on edge, symmetry both sides, pressure urceolus (8) top, four second foil gauges (9) also are connected into the full-bridge form, two second foil gauges (9) of measuring pressure are placed on the relative brachium pontis, and two second foil gauges (9) of temperature compensation are placed on another on the relative brachium pontis.
6. according to the described external drum internal target rod flow sensor of claim 1, it is characterized in that described temperature sensor (10) is the bottom that places transducer room (11) inner chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101632678A CN100425953C (en) | 2006-12-15 | 2006-12-15 | External drum internal target rod flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101632678A CN100425953C (en) | 2006-12-15 | 2006-12-15 | External drum internal target rod flow sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1975346A CN1975346A (en) | 2007-06-06 |
| CN100425953C true CN100425953C (en) | 2008-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101632678A Expired - Fee Related CN100425953C (en) | 2006-12-15 | 2006-12-15 | External drum internal target rod flow sensor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750116B (en) * | 2010-02-22 | 2011-10-12 | 泉州日新流量仪器仪表有限公司 | Force-summing element used for flowmeter |
| CN105424098A (en) * | 2015-11-13 | 2016-03-23 | 李文艺 | Volumetric flowmeter |
| CN107036666B (en) * | 2017-06-03 | 2023-10-27 | 华北水利水电大学 | Target type large-caliber pipeline water measuring device and water measuring method thereof |
| CN108225469B (en) * | 2018-03-02 | 2019-12-24 | 哈尔滨工业大学 | Parallel flow sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3638487A (en) * | 1969-11-14 | 1972-02-01 | Sands Measurement Corp | Fluid characteristic sensing device |
| CN2343576Y (en) * | 1998-10-27 | 1999-10-13 | 泉州日新流量仪器仪表有限公司 | Digital display target-type flowmeter |
| CN2369216Y (en) * | 1999-01-05 | 2000-03-15 | 万国庆 | Target flow meter |
| US6253625B1 (en) * | 2000-10-13 | 2001-07-03 | Predator Systems, Inc. | Target flow meters with immersed strain gauges |
-
2006
- 2006-12-15 CN CNB2006101632678A patent/CN100425953C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3638487A (en) * | 1969-11-14 | 1972-02-01 | Sands Measurement Corp | Fluid characteristic sensing device |
| CN2343576Y (en) * | 1998-10-27 | 1999-10-13 | 泉州日新流量仪器仪表有限公司 | Digital display target-type flowmeter |
| CN2369216Y (en) * | 1999-01-05 | 2000-03-15 | 万国庆 | Target flow meter |
| US6253625B1 (en) * | 2000-10-13 | 2001-07-03 | Predator Systems, Inc. | Target flow meters with immersed strain gauges |
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| CN1975346A (en) | 2007-06-06 |
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