CN102436012A - Device and method for detecting liquid in pipeline - Google Patents
Device and method for detecting liquid in pipeline Download PDFInfo
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- CN102436012A CN102436012A CN2011102626232A CN201110262623A CN102436012A CN 102436012 A CN102436012 A CN 102436012A CN 2011102626232 A CN2011102626232 A CN 2011102626232A CN 201110262623 A CN201110262623 A CN 201110262623A CN 102436012 A CN102436012 A CN 102436012A
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- 239000007788 liquid Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 46
- 239000002184 metal Substances 0.000 claims abstract description 46
- 230000010355 oscillation Effects 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 10
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 abstract 1
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229940058401 polytetrafluoroethylene Drugs 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
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Abstract
The invention relates to a device and a method for detecting liquid in a pipeline. The method comprises the following steps of: providing a liquid pipe for circulating liquid; providing a metal pipe for outputting self capacitance, and covering the metal pipe on the liquid pipe; providing a screen shell for screening noise which generates interference; receiving a capacitance value output by the metal pipe, and converting the capacitance value into a corresponding oscillation signal; presetting a reference frequency; and detecting the frequency of the oscillation signal, comparing the frequency of the detected oscillation signal with the preset reference frequency, outputting a signal which shows that the liquid exists in the liquid pipe if the detected frequency is less than the reference frequency, and outputting a signal which shows that the liquid does not exist in the liquid pipe if the detected frequency is more than or equal to the reference frequency. When being used for detection, the device and the method for detecting the liquid in the pipeline are not limited by the conditions such as the transparency of the liquid pipe, the transparency of the liquid, the conductivity of the liquid and the like, so that the application range is expanded.
Description
[technical field]
The present invention relates to detection range, particularly pipeline liquid-detecting and detection method.
[background technology]
In the online water quality monitor, the test of a heavy metal elements needs some kinds of reagent.Whether unusual for preventing test, needing to detect a plurality of reagent bottles all has liquid.In the process of application of sample, through signal piping whether the flow of liquid mistake is arranged, confirm whether to have in the reagent bottle liquid to exist.
The detection method of traditional pipeline liquid mainly contains two kinds, and a kind of is impedance method, the size of the resistance between two electrodes in the liquid is tested having judged whether that liquid passes through, and this method can not be tested nonconducting object, like pure water, alcohol etc.; A kind of is the transmitted light electrical method, through a power valve, shine transparent pipeline after; Shine again on the receiving tube; As transparency liquid with when not having transparency liquid to pass through, receive the light intensity that receives on the pipeline and change, this method need guarantee that pipeline is transparent and liquid is also transparent.
In sum, the existence of the detection method of traditional pipeline liquid receives many conditionalities, detects inconvenient.
[summary of the invention]
Based on this, be necessary to provide a kind of pipeline liquid-detecting of ability expanding application scope.
A kind of pipeline liquid-detecting comprises:
Liquid line is used for circulating liquid;
Be placed in the metal tube on the said liquid line, be used to export selfcapacity;
With the oscillation module that said metal tube is electrically connected, be used to receive the capacitance of said metal tube output, and said capacitance is converted into corresponding oscillator signal;
The signal processing module that is electrically connected with said oscillation module; Be used for the preset reference frequency, detect the frequency of said oscillator signal, and the frequency of the oscillator signal that detects is compared with preset reference frequency; When the frequency that detects less than reference frequency; Then export the signal that has liquid in the said liquid line, when the frequency that detects more than or equal to reference frequency, then export the signal that does not have liquid in the said liquid line;
Shielding case is used to cover said liquid line, metal tube and oscillation module, and shielding produces the noise that disturbs.
Preferably; When said liquid line is initialized empty pipe condition; The oscillator signal that said oscillation module also is used for the capacitance that detects said metal tube output is changed is as initial oscillator signal, and said signal processing module also is used for the preset difference value frequency, detects the frequency and the record of said initial oscillator signal; The frequency of said initial oscillator signal as reference frequency, and is deducted preset difference frequency with said reference frequency and obtains reference frequency.
Preferably; When not having the signal of liquid in the said liquid line of output; Said signal processing module also is used for the reference frequency zero clearing that resets; And write down the frequency of the oscillator signal of this time detection, it as new reference frequency, and is deducted the preset difference value frequency with said reference frequency and obtain new reference frequency.
Preferably, said liquid line is silicone tube, PTFE tube or FPA pipe.
In addition, also be necessary to provide a kind of pipeline liquid detecting method of ability expanding application scope.
A kind of pipeline liquid detecting method may further comprise the steps:
Be provided for the liquid line of circulating liquid;
Be provided for exporting the metal tube of selfcapacity, and said metal tube is placed on the said liquid line;
Be provided for shielding the shielding case that produces the noise that disturbs;
Receive the capacitance of said metal tube output, and said capacitance is converted into corresponding oscillator signal;
The preset reference frequency;
Detect the frequency of said oscillator signal; The frequency of the oscillator signal that detects is compared with preset reference frequency; If the frequency that detects is less than reference frequency; Then export the signal that has liquid in the said liquid line, when the frequency that detects more than or equal to reference frequency, then export the signal that does not have liquid in the said liquid line.
Preferably, when said liquid line is initialized empty pipe condition, also comprise step:
The preset difference value frequency;
The oscillator signal of the capacitance conversion that detects said metal tube output as initial oscillator signal, is detected the frequency and the record of said initial oscillator signal;
With the frequency of said initial oscillator signal as reference frequency;
Said reference frequency is deducted the preset difference value frequency obtain reference frequency.
Preferably; When the non-existent signal of output pipe liquid, also comprise step:, and write down the frequency of the oscillator signal of this time detection to the reference frequency zero clearing that resets; It as new reference frequency, and is deducted the preset difference value frequency with said reference frequency and obtain new reference frequency.
Preferably, said liquid line is silicone tube, PTFE tube or FPA pipe.
Above-mentioned pipeline liquid-detecting and method; Be placed in the electric capacity of the metal tube on the liquid line through detection, and be converted into oscillator signal, again the frequency of detection oscillator signal; The frequency and the reference frequency of oscillator signal are compared; Draw whether there is liquid in the liquid line, detect the restriction that need not receive conditions such as whether liquid line is transparent, whether liquid is transparent, whether liquid conducts electricity, enlarged range of application.
[description of drawings]
Fig. 1 is the structural representation of pipeline liquid-detecting among the embodiment;
Fig. 2 is the process flow diagram of pipeline liquid detecting method among the embodiment;
Fig. 3 is the particular flow sheet that reference frequency is set among Fig. 2.
[embodiment]
Below in conjunction with concrete embodiment and accompanying drawing pipeline liquid-detecting and detection method are carried out detailed description.
Like Fig. 1, in one embodiment, a kind of pipeline liquid-detecting comprises liquid line 10, metal tube 20, oscillation module 30, signal processing module 40 and shielding case 50.Wherein, metal tube 20 is placed on the liquid line 10, and oscillation module 30 is electrically connected with metal tube 20, and signal processing module 40 is electrically connected with oscillation module 10, and shielding case 50 covers liquid line 10, metal tube 20 and oscillation module 30.
In a preferred embodiment; When liquid line 10 is initialized empty pipe condition; The oscillator signal that oscillation module 30 also is used for the capacitance that detects metal tube 20 outputs is changed is as initial oscillator signal, and signal processing module 40 also is used for the preset difference value frequency, detects the frequency and the record of this initial oscillator signal; The frequency of this initial oscillator signal as reference frequency, and is deducted preset difference frequency with reference frequency and obtains reference frequency.When liquid line 10 is empty pipe condition; The frequency of the oscillator signal that detects can be used as reference frequency, and when this reference frequency of frequency ratio of the oscillator signal that detects once more reduced certain value, then judging had flow of liquid through liquid line 10; Wherein, this certain value is difference frequency.The value that reference frequency is deducted difference frequency is frequency as a reference, can reduce erroneous judgement.
When not having the signal of liquid in the output liquid pipe 10; Signal processing module 40 also is used for the reference frequency zero clearing that resets; And write down the frequency of the oscillator signal of this time detection, it as new reference frequency, and is deducted the preset difference value frequency with this reference frequency and obtain new reference frequency.In actual detected, when detecting blank pipe, reset at any time, can reduce the influence that circuit drift causes.Simultaneously, upgraded reference frequency, can reduce and to remain in the error that causes in the liquid line because of material in the liquid.
The principle of work of above-mentioned pipeline liquid-detecting is: utilize the difference of the specific inductive capacity of air and liquid medium, the decentralized capacitance that causes metal tube 20 to produce is different, comes whether to exist in the tracer liquid pipe 10 liquid.The variation of metal tube 20 output capacitances causes the frequency of the oscillator signal that oscillation module 30 transforms to change, and when liquid line 10 in during circulating liquid, the electric capacity of metal tube 20 outputs strengthens, and causes the frequencies go lower of the oscillator signal of oscillation module 30 generations; When liquid line 10 was empty pipe condition, the electric capacity of metal tube 20 outputs diminished, and caused the frequency gets higher of the oscillator signal of oscillation module 30 generations.The difference of frequency when signal processing module 40 detects blank pipe and full packages state can judge whether there is liquid in the liquid line 10.
As shown in Figure 2, in one embodiment, a kind of pipeline liquid detecting method may further comprise the steps:
Step S210 is provided for the liquid line of circulating liquid.
A liquid line of circulation for liquid is provided.This liquid line is silicone tube, PTFE tube or FPA pipe.Adopt silicone tube, PTFE tube or the FPA pipe of corrosion resistivity, negotiable corrosive liquids.
Step S220 is provided for exporting the metal tube of selfcapacity, and metal tube is placed on the liquid line.
Step S230 is provided for shielding the shielding case that produces the noise that disturbs.
The selfcapacity of aforesaid metal tube is the decentralized capacitance with respect to the stratum of PCB and shielding case formation.
This shielding case has covered liquid line and metal tube, is used to shield oscillator signal is produced the noise that disturbs, and reduces outer bound pair metal tube output capacitance and exerts an influence, and improves the accuracy that detects.
Step S240 receives the capacitance that metal tube is exported, and this capacitance is converted into corresponding oscillator signal.
Step S250, the preset reference frequency.
At liquid line is initialized empty pipe condition, the state during circulating liquid not after promptly installing, and as shown in Figure 3, the concrete steps of preset reference frequency can be:
Step S251, the preset difference value frequency.
This difference frequency can be preestablished by the user.
Step S252 as initial oscillator signal, detects the frequency and the record of this initial oscillator signal with the oscillator signal of the capacitance conversion that detects metal tube output.
The metal tube output capacitance converts this capacitance into oscillator signal, and this oscillator signal is as initial oscillator signal.
Step S253, with the frequency of initial oscillator signal as reference frequency.
Step S254 deducts preset difference frequency with reference frequency and obtains reference frequency.
The frequency ratio reference frequency of the oscillator signal that detects reduces certain value, judges then to have liquid in the liquid line that this certain value is difference frequency.The value that reference frequency is deducted difference frequency is frequency as a reference, can reduce erroneous judgement.
Step S260, the frequency of detection oscillator signal compares the frequency of the oscillator signal that detects and preset reference frequency.
Step S270, whether the frequency that judge to detect less than reference frequency, if, execution in step S280 then, if not, execution in step S290 then.
There is the signal of liquid in step S280 in the output liquid pipe.
There is not the signal of liquid in step S290 in the output liquid pipe.
In a preferred embodiment; When the non-existent signal of output pipe liquid; Above-mentioned pipeline liquid detecting method also comprises step: to the reference frequency zero clearing that resets; And write down the frequency of the oscillator signal of this time detection, it as new reference frequency, and is deducted the preset difference value frequency with new reference frequency and obtain new reference frequency.Upgraded reference frequency, can reduce and to remain in the error that causes in the liquid line because of material in the liquid.
Above-mentioned pipeline liquid-detecting and method; Be placed in the electric capacity of the metal tube on the liquid line through detection, and be converted into oscillator signal, again the frequency of detection oscillator signal; The frequency and the reference frequency of oscillator signal are compared; Draw whether there is liquid in the liquid line, detect the restriction that need not receive conditions such as whether liquid line is transparent, whether liquid is transparent, whether liquid conducts electricity, enlarged range of application.
In addition, whether transparent etc. because of not considering liquid line, the liquid line material is easy to obtain; When liquid line adopted silica gel, PTFE or FPA, negotiable corrosive liquids had further enlarged range of application; Because of the principle that detects is based on the difference of the specific inductive capacity of medium, metal tube does not need to contact with liquid to be detected; The variation of the oscillation signal frequency that the detection capacitance variations causes, it is highly sensitive.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.
Claims (8)
1. a pipeline liquid-detecting is characterized in that, comprising:
Liquid line is used for circulating liquid;
Be placed in the metal tube on the said liquid line, be used to export selfcapacity;
With the oscillation module that said metal tube is electrically connected, be used to receive the capacitance of said metal tube output, and said capacitance is converted into corresponding oscillator signal;
The signal processing module that is electrically connected with said oscillation module; Be used for the preset reference frequency, detect the frequency of said oscillator signal, and the frequency of the oscillator signal that detects is compared with preset reference frequency; When the frequency that detects less than reference frequency; Then export the signal that has liquid in the said liquid line, when the frequency that detects more than or equal to reference frequency, then export the signal that does not have liquid in the said liquid line;
Shielding case is used to cover said liquid line, metal tube and oscillation module, and shielding produces the noise that disturbs.
2. pipeline liquid-detecting according to claim 1; It is characterized in that; When said liquid line is initialized empty pipe condition; The oscillator signal that said oscillation module also is used for the capacitance that detects said metal tube output is changed is as initial oscillator signal, and said signal processing module also is used for the preset difference value frequency, detects the frequency and the record of said initial oscillator signal; The frequency of said initial oscillator signal as reference frequency, and is deducted preset difference frequency with said reference frequency and obtains reference frequency.
3. pipeline liquid-detecting according to claim 2; It is characterized in that; When there was not the signal of liquid in output in the said liquid line, said signal processing module also was used for the reference frequency zero clearing that resets, and write down the frequency of the oscillator signal of this time detection; It as new reference frequency, and is deducted the preset difference value frequency with said reference frequency and obtain new reference frequency.
4. pipeline liquid-detecting according to claim 1 is characterized in that, said liquid line is silicone tube, PTFE tube or FPA pipe.
5. pipeline liquid detecting method may further comprise the steps:
Be provided for the liquid line of circulating liquid;
Be provided for exporting the metal tube of selfcapacity, and said metal tube is placed on the said liquid line;
Be provided for shielding the shielding case that produces the noise that disturbs;
Receive the capacitance of said metal tube output, and said capacitance is converted into corresponding oscillator signal;
The preset reference frequency;
Detect the frequency of said oscillator signal; The frequency of the oscillator signal that detects is compared with preset reference frequency; If the frequency that detects is less than reference frequency; Then export the signal that has liquid in the said liquid line, when the frequency that detects more than or equal to reference frequency, then export the signal that does not have liquid in the said liquid line.
6. pipeline liquid detecting method according to claim 5 is characterized in that, when said liquid line is initialized empty pipe condition, also comprises step:
The preset difference value frequency;
The oscillator signal of the capacitance conversion that detects said metal tube output as initial oscillator signal, is detected the frequency and the record of said initial oscillator signal;
With the frequency of said initial oscillator signal as reference frequency;
Said reference frequency is deducted the preset difference value frequency obtain reference frequency.
7. pipeline liquid detecting method according to claim 6; It is characterized in that; When the non-existent signal of output pipe liquid, also comprise step:, and write down the frequency of the oscillator signal of this time detection to the reference frequency zero clearing that resets; It as new reference frequency, and is deducted the preset difference value frequency with said reference frequency and obtain new reference frequency.
8. pipeline liquid detecting method according to claim 5 is characterized in that, said liquid line is silicone tube, PTFE tube or FPA pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110262623.2A CN102436012B (en) | 2011-09-06 | 2011-09-06 | Device and method for detecting liquid in pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110262623.2A CN102436012B (en) | 2011-09-06 | 2011-09-06 | Device and method for detecting liquid in pipeline |
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| CN102436012A true CN102436012A (en) | 2012-05-02 |
| CN102436012B CN102436012B (en) | 2014-05-07 |
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| CN201110262623.2A Active CN102436012B (en) | 2011-09-06 | 2011-09-06 | Device and method for detecting liquid in pipeline |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529485A (en) * | 2013-10-30 | 2014-01-22 | 安徽英特电子有限公司 | Liquid-deficient monitor for transparent pipeline |
| CN110530644A (en) * | 2019-09-28 | 2019-12-03 | 潍柴西港新能源动力有限公司 | The system and method for bench test engine coolant automatic liquid supply and recycling |
| WO2022105516A1 (en) * | 2020-11-18 | 2022-05-27 | 追觅创新科技(苏州)有限公司 | Medium detection device and method, storage medium, and cleaning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2089618U (en) * | 1991-03-06 | 1991-11-27 | 南京电脑计量设备公司 | Material flow measuring device in gas or solid phase flow |
| CN200986461Y (en) * | 2006-07-28 | 2007-12-05 | 华南农业大学 | Intelligent capacitance type liquid level measuring apparatus |
| CN101358868A (en) * | 2008-09-10 | 2009-02-04 | 南京林业大学 | Capacitance liquid level sensor and liquid level detector using the sensor |
-
2011
- 2011-09-06 CN CN201110262623.2A patent/CN102436012B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2089618U (en) * | 1991-03-06 | 1991-11-27 | 南京电脑计量设备公司 | Material flow measuring device in gas or solid phase flow |
| CN200986461Y (en) * | 2006-07-28 | 2007-12-05 | 华南农业大学 | Intelligent capacitance type liquid level measuring apparatus |
| CN101358868A (en) * | 2008-09-10 | 2009-02-04 | 南京林业大学 | Capacitance liquid level sensor and liquid level detector using the sensor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529485A (en) * | 2013-10-30 | 2014-01-22 | 安徽英特电子有限公司 | Liquid-deficient monitor for transparent pipeline |
| CN103529485B (en) * | 2013-10-30 | 2017-01-04 | 安徽英特电子有限公司 | Liquid-deficient monitor for transparent pipeline |
| CN110530644A (en) * | 2019-09-28 | 2019-12-03 | 潍柴西港新能源动力有限公司 | The system and method for bench test engine coolant automatic liquid supply and recycling |
| WO2022105516A1 (en) * | 2020-11-18 | 2022-05-27 | 追觅创新科技(苏州)有限公司 | Medium detection device and method, storage medium, and cleaning device |
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| CN102436012B (en) | 2014-05-07 |
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