CN104596589A - Paddle wheel type flowmeter capable of detecting flow direction and detection method thereof - Google Patents
Paddle wheel type flowmeter capable of detecting flow direction and detection method thereof Download PDFInfo
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- CN104596589A CN104596589A CN201510015766.1A CN201510015766A CN104596589A CN 104596589 A CN104596589 A CN 104596589A CN 201510015766 A CN201510015766 A CN 201510015766A CN 104596589 A CN104596589 A CN 104596589A
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Abstract
The invention discloses a paddle wheel type flowmeter capable of detecting the flow direction, comprising a body, and an arithmetic unit, a sensing unit and a rotary assembly which are arranged in the body. The rotary assembly is in correspondence to the sensing unit and is arranged in a part, extending into a pipeline,of the body; the rotary assembly comprises a spindle and a plurality of sensing blades arranged at interval; the sensing blades are respectively provided with metal pieces with different dielectric coefficients; the metal pieces are ordered according to the dielectric coefficients and are orderly arranged on the sensing blades; fluid drives the sensing blades to rotate, and induction is generated to the sensing unit to generate a sensing signal; the sensing unit transmits the sensing signal to the arithmetic unit; thereby, the flow direction of the fluid appears in a manner of gradually progressive increase or progressive decrease through the sensing signal strength and can be judged as forward flow or reversed flow.
Description
Technical field
The present invention relates to flow detection technical field, particularly relate to a kind of the web type flowmeter and the detection method thereof that detect the flow direction.
Background technology
Web type flowmeter (Paddlewheel Flowmeter) is a kind of flow sensor, and it mainly comprises the assemblies such as rotor, bearing, rotating shaft, magnet, main body, the Hall element (Hall Effect Sensor) being embedded in main body and sensing circuit plate; Wherein, rotor is built with magnet, and induced signal produces by Hall element and magnet produce excitatory.When rotor rotates by fluid driven, imbed and can and then rotate at the magnet of rotor, and pulse signal can be induced when passing through Hall element, and then try to achieve fluid flow.
But, the rotor of tradition web type flowmeter but, the rotor of tradition web type flowmeter must imbed magnetic material, can, because occupy gift temperature effect (Curie Temperature Effect), make magnetic material easily because being caused induction to produce misjudgement by demagnetization when testing liquid is high temperature.Moreover traditional web type flowmeter can only detect fluid flow merely, but cannot detect direction of flow, reduces the convenience in use.In addition, when rotor dirt deposits, also cannot detect this abnormal occurrence, time-based maintenance is done to this abnormal occurrence, therefore the error easily measured.
In view of this, be necessary to improve existing web type flowmeter.
Summary of the invention
The object of the present invention is to provide a kind of web type flowmeter detecting the flow direction, to realize judging the flow direction of fluid in pipeline.
In order to realize above object, the invention provides a kind of web type flowmeter detecting the flow direction, for measuring flow and the flow direction of a pipeline inner fluid, this web type flowmeter comprises:
Body, is arranged on the side of described pipeline and part stretches into described pipeline;
Arithmetic element, is arranged in described body;
Sensing cell, to be arranged in described body and to be electrically connected described arithmetic element; And
Rotary components, is arranged on described body and stretches in the part of described pipeline, and corresponding with described sensing cell; Described rotary components comprises rotating shaft and is disposed on described turn axial a plurality of induction blade, each induction blade is respectively equipped with metalwork, each metalwork has different dielectric coefficients, and each metalwork is sequentially arranged in each induction blade according to dielectric coefficient sequence;
Wherein, the rolling tangential direction of induction blade ora terminalis is the flow direction of fluid, when described pipeline inner fluid flows through induction blade, blade rotary can be answered by dynamic, make described sensing cell sense those metalworks with different dielectric coefficient and produce intensity progressively increasing or decreasing a plurality of sensing signal and be passed to described arithmetic element and carry out computing, judge that described fluid is forward flow or reversed flow by this.
In one embodiment of the invention, the material of described body be pottery, can any one in heat-proof macromolecule material, compound substance or metal.
In one embodiment of the invention, the relatively described rotating shaft of described a plurality of induction blade is symmetric setting.
In one embodiment of the invention, described metalwork be embedded correspondence induction blade surface and with described fluid contact.
In one embodiment of the invention, described sensing cell is an oscillatory circuit, and this sensing cell comprises Inductive component and the capacitance component in parallel with this Inductive component.
In one embodiment of the invention, this web type flowmeter comprises a signal conversion unit further, this signal conversion unit is electrically connected described sensing cell and described arithmetic element, described sensing signal is resent to described arithmetic element after being converted to periodic wave signal by described signal conversion unit, and converts flow signal to by the computing of described arithmetic element.
In one embodiment of the invention, this web type flowmeter comprises a voltage regulation unit further, this voltage regulation unit is electrically connected this arithmetic element and this signal conversion unit respectively, and this voltage regulation unit exports a galvanic current potential source and is supplied to this arithmetic element and this signal conversion unit.
In one embodiment of the invention, this web type flowmeter comprises reception external information further or supplies information to the transmission interface unit that this arithmetic element carries out computing, this transmission interface unit is electrically connected this arithmetic element, and this sensing signal is sent to outside through this transmission interface unit by this arithmetic element system.
Meanwhile, the present invention also provides a kind of detection method detecting the web type flowmeter of the flow direction, and whether the induction blade for the web type flowmeter to above-mentioned the detected flow direction induction deterioration occurs is detected, and comprises the following steps:
A) default value is determined in arithmetic element;
B) receiving intensity changes a plurality of sensing signals of progressively increasing or decreasing;
C) utilize the intensity of those sensing signals to compare, acquisition one measures most eigenwert; And
D) this arithmetic element utilizes this measurement most eigenwert and this default value to carry out the judgement of degradation.
10, the web type flowmeter of the flow direction can be detected as claimed in claim 9, it is characterized in that, step a) also comprise determine one preset gap value, this detection method comprises a step e further) and a step f), wherein, step e) for this measurement most eigenwert of comparison and this default value so that draw a measurement gap value, step f) for comparing this measurement gap value and this default gap value thus judging induction deterioration.
In one embodiment of the invention, also comprise step e '), this step e ') for obtaining multiple measurement most eigenwert and sorting, those measurement most eigenwerts and this default value are compared, when wherein those measurement most eigenwerts are equal to or less than this default value, be then judged as induction deterioration.
In one embodiment of the invention, this default value and this measurement most eigenwert have a signal waveform respectively, steps d) comprise and respectively the signal waveform of this measurement most eigenwert and this default value is calculated to integral area and draws an area discrepancy value, this area discrepancy value is equal to or greater than a standard deviation apart from value and judges that induction is deteriorated.
The present invention, owing to adopting above technical scheme, makes it compared with prior art, has following advantage and good effect:
1) due to the metalwork of web type flowmeter of the present invention and nonmagnetic substance, therefore metalwork can not be subject to high temperature and affect measurement, therefore still can keep the accuracy that measures when can be applicable to the flow measuring high temperature fluid;
2) the web type flowmeter detecting the flow direction of the present invention is the metalwork being provided with different dielectric coefficient in each induction blade, and according to dielectric coefficient sequence, each metalwork is sequentially arranged in each induction blade, due to sensing signal can corresponding different dielectric coefficient metalwork and produce different induced signal intensity levels, therefore, the flow direction of fluid just can be judged as forward flow or reversed flow through the mode of sensing signal intensity progressively increasing or decreasing presents, and increases convenience when using.
Accompanying drawing explanation
Fig. 1 is the perspective exploded view that the present invention can detect the web type flowmeter of the flow direction;
Fig. 2 is the assembled sectional view that the present invention can detect the web type flowmeter of the flow direction;
Fig. 3 is the circuit box schematic diagram that the present invention can detect the web type flowmeter of the flow direction;
Fig. 4 is the sensing signal schematic diagram that the present invention can detect the web type flowmeter of the flow direction;
Fig. 5 is another use schematic diagram that the present invention can detect the web type flowmeter of the flow direction;
Fig. 6 is another sensing signal schematic diagram that the present invention can detect the web type flowmeter of the flow direction;
Fig. 7 is the sensing signal die-away curve schematic diagram that the present invention can detect the web type flowmeter of the flow direction;
Fig. 8 is the second embodiment of induction blade of the present invention;
Fig. 9 is the 3rd embodiment of induction blade of the present invention.
Symbol description:
1-web type flowmeter
2-pipeline
3-deposits foreign object
10-body
101-first accommodation space
102-second accommodation space
20-arithmetic element
21-circuit board
22-signal conversion unit
23-voltage regulation unit
24-transmission interface unit
30-sensing cell
31-Inductive component
32-capacitance component
40-rotary components
41-rotating shaft
42,42a, 42b-induction blade
43,43a, 43b-metalwork
50,50 '-sensing signal
500-default value
500 '-measure most eigenwert
501-standard minimal value
501 '-measure minimal value
504-standard maximum value
504 '-measure maximum value
D-presets gap value
D '-measurement gap value
A '-area discrepancy value.
Embodiment
Below in conjunction with the drawings and specific embodiments, the web type flowmeter of the detected flow direction that the present invention proposes and detection method thereof are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only for object that is convenient, the aid illustration embodiment of the present invention lucidly.
Please refer to Fig. 1 to Fig. 3, it is respectively the present invention can detect the perspective exploded view of the web type flowmeter of the flow direction, assembled sectional view and circuit box schematic diagram.The invention provides a kind of web type flowmeter 1 detecting the flow direction, it is for measuring flow and the flow direction of pipeline 2 inner fluid.This web type flowmeter 1 comprises body 10, arithmetic element 20, sensing cell 30 and a rotary components 40.This body 10 is arranged on the side of this pipeline 2 and part stretches into this pipeline 2.This arithmetic element 20 and this sensing cell 30 are all arranged in this body 10.This rotary components 40 is arranged on this body 10, for contacting the fluid in this pipeline 2.
In one embodiment of this invention, this body 10 is a shell block and has one first accommodation space 101 and one second accommodation space 102 separated and arrange.Further, this body 10 can by pottery, can made by any one of heat-proof macromolecule material, compound substance or metal, but not as restriction.In the present embodiment, this second accommodation space 102 is formed in one end of this body 10, and this rotary components 40 groups is located in this second accommodation space 102.When this body 10 groups is located at this pipeline 2, this second accommodation space 102 is connected with the inside of this pipeline 2.
This arithmetic element 20 and this sensing cell 30 are arranged in this first accommodation space 101, and this sensing cell 30 is electrically connected this arithmetic element 20.In the present embodiment, this arithmetic element 20 is arranged on a circuit board 21.In addition, this sensing cell 30 is set to an oscillatory circuit, and this sensing cell 30 comprises an Inductive component 31 and a capacitance component 32 in parallel with this Inductive component 31.
The plural induction blade 42 that this rotary components 40 comprises a rotating shaft 41 and is disposed on around this rotating shaft 41.Preferably, this rotating shaft 41 relative of those induction blade 42 is symmetric setting, to provide stable and to rotate smoothly.In addition, each induction blade 42 is provided with a metalwork 43; And those metalworks 43 have different dielectric coefficients, and those metalworks 43 are sequentially arranged in those induction blade 42 according to the sequence of those dielectric coefficients.Preferably, this rotary components 40 is to should sensing cell 30 and group is located at this body 10 stretches in the part of this pipeline 2.
In the present embodiment, metalwork 43 embeds in corresponding induction blade 42 and fluid isolation, actual when implementing, this metalwork 43 also can be embedded induction blade 42 surface in correspondence and and fluid contact.
As shown in Figure 2, flow through this rotary components 40 when the fluid in this pipeline 2 and drive those induction blade 42 to rotate, and induction is produced to this sensing cell 30.This sensing cell 30 senses the metalwork 43 of each induction blade 42 and produces sensing signal 50 (please refer to Fig. 4), and this sensing signal 50 is passed to this arithmetic element 20 and carries out computing by this metalwork 43 again.Follow-up, this arithmetic element 20 can be carried out the flow direction according to those sensing signals 50 and be judged, about the judgement flowed to will be introduced in detail below.
Please refer to Fig. 3, it can detect the circuit box schematic diagram of the web type flowmeter of the flow direction for the present invention.In one embodiment of this invention, this web type flowmeter 1 comprises signal conversion unit 22, voltage regulation unit 23 and a transmission interface unit 24 further.This signal conversion unit 22 is electrically connected this arithmetic element 20 and this sensing cell 30, one oscillating impulse is converted to periodic wave signal (as square-wave signal) through this signal conversion unit 22 and is resent to this arithmetic element 20 by those sensing signals 50, and converts flow signal to through the computing of this arithmetic element 20.This voltage regulation unit 23 is electrically connected this arithmetic element 20 and this signal conversion unit 22 respectively.This voltage regulation unit 23 mainly exports a galvanic current potential source, and is supplied to this arithmetic element 20 and this signal conversion unit 22 is used as power supply.This transmission interface unit 24 is electrically connected this arithmetic element 20, this transmission interface unit 24 carries out computing from the known information of external reception (as temperature, pressure or vibrations etc.) to this arithmetic element 20, or provide known signal (as communication delivery protocol etc.).
Please continue with reference to Fig. 4, it can detect the sensing signal schematic diagram of the web type flowmeter of the flow direction for the present invention.After web type flowmeter 1 of the present invention operates, those induction blade 42 produce rotation by the drive of fluid of passing through.Because those metalworks 43 are sequentially arranged in those induction blade 42 according to dielectric coefficient sequence, the sensing signal 50 that therefore this arithmetic element 20 produces according to each metalwork 43 can present in the mode increasing (ascending order) or reduction (descending) gradually gradually.Accordingly, the mode that namely flow direction of fluid is through those sensing signals 50 progressively increasing or decreasing presents and can be judged as forward flow or reversed flow.Such as, those sensing signals 50 can be made to present progressively to increase progressively (ascending order) mode when those induction blade 42 of fluid forces counterclockwise rotate, then when those sensing signals 50 in (descending) mode of progressively successively decreasing in current, fluid system can be known by inference and promote the rotation of those induction blade 42 clockwise direction, learn the flow direction of fluid thus.
In addition, web type flowmeter 1 of the present invention, except detecting fluid flow and the flow direction, can also be used for the induction degradation judging those induction blade 42.By knowing of induction degradation, user can respond to the foundation of degradation as the induction blade 42 of this web type flowmeter 1 of maintaining by this.The explanation of this induction degradation will hereafter describe in detail.
Please refer to Fig. 5 and Fig. 6, it is respectively another use schematic diagram and sensing signal schematic diagram of web type flowmeter of the present invention.The application of web type flowmeter 1 of the present invention is wide, such as, in the industry such as pharmacy, food or tap water, web type flowmeter 1 all can be utilized to measure fluid flow in processing procedure.Due to web type flowmeter 1 after long-term use, induction blade 42 surface of this rotary components 40 may deposit foreign object 3 (as shown in Figure 5), as iron filings, hair, fiber etc.Foreign object deposition can cause decay to sensing signal, and this is so-called induction degradation in the present invention.
When induction blade 42 surface deposition foreign object 3, the sensing signal 50 ' that this web type flowmeter 1 produces can produce decay; As shown in Figure 5, it is the sensing signal 50 ' of display decay and comparing of original sensing signal 50.
The present invention also provides a kind of detection method detecting the web type flowmeter of the flow direction, this detection method comprise following steps:
Step is a): arithmetic element 20 determines a default value (Threshold Value) 500 from sensing signal 50.This default value 500 is a standard extremum, as standard minimal value 501 or a standard maximum value 504.
Step b): the plural sensing signal 50 ' receiving respectively this induction blade 42 Strength Changes progressively increasing or decreasing.
Step c): utilize those sensing signals 50 ' to compare, acquisition one measures most eigenwert 500 ', as one measures minimal value 501 ' or a measurement maximum value 504 '.
Steps d): utilize this to have judgement that this measurement most eigenwert 500 ' and this default value 500 carry out degradation of this arithmetic element 20.For example, the default value 500 of working as in a) step is set to standard maximum value 504, step c) in measurement most eigenwert 500 ' for measuring maximal value 504 '; Therefore, after comparison standard maximum value 504 with measurement maximal value 504 ', if when measurement maximal value 504 ' is less than or equal to standard maximum value 504, then be judged as induction deterioration, now must carry out cleaning upkeep operation to the induction blade 42 of this web type flowmeter 1, use and keep correct measurement.
Similarly, when step a) in default value 500 be set to standard minimal value 501 time, step c) in measurement most eigenwert 500 ' for measuring minimum value 501; Therefore, after comparison standard minimal value 501 with measurement minimum value 501 ', if when measurement minimum value 501 ' is less than or equal to this standard minimal value 501, be then judged as induction deterioration.Namely, can learn after those sensing signals 50 ' decay to certain value and must carry out cleaning upkeep operation to the induction blade 42 of this web type flowmeter 1.
In the present embodiment, minimum value in those sensing signals 50 that this web type flowmeter 1 is initial and maximal value are default value 500 (comprising standard minimal value 501 and standard maximum value 504), this web type flowmeter 1 follow-up those sensing signals 50 ' of measuring compare with initial sensing signal 50 judgement carrying out responding to degradation respectively.
Be noted that in addition, abovementioned steps a) also comprise determine one preset gap value D (not shown), described detection method comprises a step e further) and a step f), this step e) for this measurement most eigenwert 500 ' of comparison and this default value 500 and then draw a measurement gap value D ', this step f) for comparing this measurement gap value D ' and this default gap value D, thus judge whether induction deterioration; That is, when this measurement gap value D ' is equal to or greater than this default gap value D, be then judged as induction deterioration.
Another is noted that induction degradation of the present invention is except judging by the extremum of sensing signal 50,50 ', and the mode calculating integral area also can be utilized to carry out.In more detail, as standard deviation is set as area discrepancy value apart from value.Then steps d of the present invention) in, can comprise and respectively the signal waveform of this measurement most eigenwert 500 ' and this default value 500 is calculated to integral area and draws an area discrepancy value A '.Therefore, this induction degradation can pass through this area discrepancy value A ' and is equal to or greater than this standard deviation and is judged as deterioration apart from during value.
Please continue with reference to Fig. 7, it is the die-away curve of the sensing signal of web type flowmeter of the present invention.Induction degradation of the present invention also can utilize the die-away curve of sensing signal to do and judge.As shown in Figure 7, it is show sensing signal 50,50 ' (preferably, extreme maximum or minimum value) at the measuring value of different time, as can be seen from Figure, sensing signal 50,50 ' is decayed gradually in the mode of negative slope, during actual enforcement, user is judged as deterioration after induction degradation can being set as decaying to a setting value.For example, detection method of the present invention can more comprise a step e '), this step e ') for obtaining multiple measurement most eigenwert 500 ' and sorting, those are measured most eigenwert 500 ' compare with this default value 500, when wherein those measurement most eigenwerts 500 ' are equal to or less than this default value 500, be then judged as induction deterioration.
It should be noted that the induction blade of rotary components of the present invention has multiple enforcement pattern.As Fig. 8 and Fig. 9, its another two kinds of showing induction blade of the present invention implement aspect; In Fig. 8, metalwork 43a embeds in induction blade 42a and fluid isolation, and induction blade 42a is with interval and the aspect setting be separated.In addition, in Fig. 9, metalwork 43b embeds in induction blade 42b, but respectively the side periphery of this induction blade 42a is that the aspect connecting adjacent induction blade 42a is arranged.
Generally speaking, induction blade 42 of the present invention, 42a, 42b are symmetric setting, and use and provide stable and rotate smoothly, during actual enforcement, the number of blade and the shape of induction blade 42,42a, 42b neither limit.
Above-described embodiment is only illustrate for convenience of description, and the interest field that the present invention advocates should be as the criterion with described in claim, but not is only limitted to described embodiment.
Obviously, those skilled in the art can carry out various change and modification to invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (12)
1. can detect a web type flowmeter for the flow direction, it is characterized in that, for measuring flow and the flow direction of a pipeline inner fluid, this web type flowmeter comprises:
Body, is arranged on the side of described pipeline and part stretches into described pipeline;
Arithmetic element, is arranged in described body;
Sensing cell, to be arranged in described body and to be electrically connected described arithmetic element; And
Rotary components, is arranged on described body and stretches in the part of described pipeline, and corresponding with described sensing cell; Described rotary components comprises rotating shaft and is disposed on described turn axial a plurality of induction blade, each induction blade is respectively equipped with metalwork, each metalwork has different dielectric coefficients, and each metalwork is sequentially arranged in each induction blade according to dielectric coefficient sequence;
Wherein, the rolling tangential direction of induction blade ora terminalis is the flow direction of fluid, when described pipeline inner fluid flows through induction blade, blade rotary can be answered by dynamic, make described sensing cell sense those metalworks with different dielectric coefficient and produce intensity progressively increasing or decreasing a plurality of sensing signal and be passed to described arithmetic element and carry out computing, judge that described fluid is forward flow or reversed flow by this.
2. can detect the web type flowmeter of the flow direction as claimed in claim 1, it is characterized in that, the material of described body be pottery, can any one in heat-proof macromolecule material, compound substance or metal.
3. can detect the web type flowmeter of the flow direction as claimed in claim 1, it is characterized in that, the relatively described rotating shaft of described a plurality of induction blade is symmetric setting.
4. can detect the web type flowmeter of the flow direction as claimed in claim 1, it is characterized in that, described metalwork be embedded correspondence induction blade surface and with described fluid contact.
5. can detect the web type flowmeter of the flow direction as claimed in claim 1, it is characterized in that, described sensing cell is an oscillatory circuit, and this sensing cell comprises Inductive component and the capacitance component in parallel with this Inductive component.
6. can detect the web type flowmeter of the flow direction as claimed in claim 1, it is characterized in that, this web type flowmeter comprises a signal conversion unit further, this signal conversion unit is electrically connected described sensing cell and described arithmetic element, described sensing signal is resent to described arithmetic element after being converted to periodic wave signal by described signal conversion unit, and converts flow signal to by the computing of described arithmetic element.
7. can detect the web type flowmeter of the flow direction as claimed in claim 6, it is characterized in that, this web type flowmeter comprises a voltage regulation unit further, this voltage regulation unit is electrically connected this arithmetic element and this signal conversion unit respectively, and this voltage regulation unit exports a galvanic current potential source and is supplied to this arithmetic element and this signal conversion unit.
8. can detect the web type flowmeter of the flow direction as claimed in claim 1, it is characterized in that, this web type flowmeter comprises reception external information further or supplies information to the transmission interface unit that this arithmetic element carries out computing, this transmission interface unit is electrically connected this arithmetic element, and this sensing signal is sent to outside through this transmission interface unit by this arithmetic element system.
9. can detect a detection method for the web type flowmeter of the flow direction, whether the induction blade for the web type flowmeter to the detected flow direction according to any one of claim 1 to 8 induction deterioration occurs is detected, and it is characterized in that, comprises the following steps:
A) default value is determined in arithmetic element;
B) receiving intensity changes a plurality of sensing signals of progressively increasing or decreasing;
C) utilize the intensity of those sensing signals to compare, acquisition one measures most eigenwert; And
D) this arithmetic element utilizes this measurement most eigenwert and this default value to carry out the judgement of degradation.
10. can detect the web type flowmeter of the flow direction as claimed in claim 9, it is characterized in that, step a) also comprise determine one preset gap value, this detection method comprises a step e further) and a step f), wherein, step e) for this measurement most eigenwert of comparison and this default value so that draw a measurement gap value, step f) for comparing this measurement gap value and this default gap value thus judging induction deterioration.
The 11. web type flowmeter that can detect the flow direction as claimed in claim 9, it is characterized in that, also comprise step e '), this step e ') for obtaining multiple measurement most eigenwert and sorting, those measurement most eigenwerts and this default value are compared, when wherein those measurement most eigenwerts are equal to or less than this default value, be then judged as induction deterioration.
The 12. web type flowmeter that can detect the flow direction as claimed in claim 9, it is characterized in that, this default value and this measurement most eigenwert have a signal waveform respectively, steps d) comprise and respectively the signal waveform of this measurement most eigenwert and this default value is calculated to integral area and draws an area discrepancy value, this area discrepancy value is equal to or greater than a standard deviation apart from value and judges that induction is deteriorated.
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| CN201510015766.1A CN104596589B (en) | 2015-01-13 | 2015-01-13 | The web type flowmeter and its detection method of detectable flow direction |
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| CN202471138U (en) * | 2012-02-16 | 2012-10-03 | 浙江先芯科技有限公司 | High-stability nonmagnetic flowmeter |
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| CN103575340A (en) * | 2013-08-22 | 2014-02-12 | 浙江利尔达物联网技术有限公司 | Liquid flow non-magnetic detector and detection method thereof |
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| US4885943A (en) * | 1988-05-11 | 1989-12-12 | Hydro-Craft, Inc. | Electronic flowmeter system and method |
| US5450760A (en) * | 1993-10-18 | 1995-09-19 | Lew; Hyok S. | Turbine flowmeter with capacitive transducer |
| CN102809409A (en) * | 2011-05-31 | 2012-12-05 | 通用汽车环球科技运作有限责任公司 | System and method for detecting failures of mass airflow sensors in a parallel intake engine |
| CN102384770A (en) * | 2011-08-11 | 2012-03-21 | 唐山海森电子有限公司 | Flow sensor for water source well |
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