CN101334306A - Liquid level detector and its detection method - Google Patents
Liquid level detector and its detection method Download PDFInfo
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- CN101334306A CN101334306A CNA2007101181108A CN200710118110A CN101334306A CN 101334306 A CN101334306 A CN 101334306A CN A2007101181108 A CNA2007101181108 A CN A2007101181108A CN 200710118110 A CN200710118110 A CN 200710118110A CN 101334306 A CN101334306 A CN 101334306A
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Abstract
The invention discloses a liquid level detection device which comprises a main control unit and a receiving unit, wherein, the main control unit comprises a signal generating and sending module used for sending a detection signal with preset strength to the receiving unit; a signal receiving module used for transmitting a first position signal to an external testing device after receiving the first position signal, and sending a second position signal to the external testing device when judging that the first position signal is not received in a preset timing interval; the receiving unit comprises a signal processing module used for sending the first position signal to the main control unit after receiving a detection signal with enough strength. The invention also discloses another liquid level detection device and a liquid level detection method. The invention has the advantages as follows: (1) the realization is simple and the liquid level detection is accurate and reliable; (2) the integrated design of the structure prolongs the service life of the device and reduces the maintenance cost; and (3) the invention is applicable to long distance testing and has no requirements on the tested conducting liquid medium.
Description
Technical field
The present invention relates to level detection, relate to liquid level sensor and detection method thereof especially, belong to electronic technology field.
Background technology
Liquid level gauge, level switch (also claiming the liquid level limit switch) are two kinds of level detection sensors commonly used, wherein, liquid level gauge is meant the sensor that real-time continuous detects is carried out in the variation of liquid level in the container, and level switch is meant whether the height to liquid level in the container arrives the sensor that a certain ad-hoc location (being generally the upper limit or lower limit) detects.The result that liquid level is detected that is based on above-mentioned two kinds of sensors realizes this shows different purposes, how to carry out effective level detection and has direct influence for the performance quality of the sensor.In the prior art, carry out level detection following several method arranged usually:
(1) connecting rod float-ball type liquid level checking method, realization principle in this method is: use a density less than fluid to be measured, the ball float that the center is porose, a stock passes the hole in the middle of the ball float, make the ball float can be along the bar free movement, bar is stood in the ball float of fluid to be measured, ball float floats on the liquid level, and the position of measuring ball float by principles such as Hall, magnetostriction obtains the position of liquid level; But in this method implementation procedure, because ball float is with motion of melt surface, the space is limited between hole in the middle of the ball float and the connecting rod, in fluid to be measured, contain impurity or with the passing of time the material of deposition all might block ball float, thereby can't guarantee the accuracy of measurement result;
(2) conductance type liquid level checking method, this method utilize the character of fluid to be measured conduction to measure, and when liquid level flooded detecting electrode, resistance decreasing between the electrode detected liquid level position with this.Measure conduction and nonflammable, incorrosive liquid but this method only is applicable to, and metal electrode also is subjected to corrosion oxidation easily and lost efficacy;
(3) electro-magnetic wave absorption formula liquid level checking method, this method utilize different medium that the difference of electro-magnetic wave absorption degree is carried out level detection.This pick-up unit partly is made up of transmitter and sounding rod two.To external radiation, it also is different that different medium absorbs electromagnetic ability to electromagnetic wave in sounding rod.The consumption of electromagnetic wave energy has reflected the degree of depth of liquid level after medium is determined.But this method is not suitable for wide range and detects, and detects that influenced by measured medium bigger, is not useable for measuring impure more liquid.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of liquid level sensor and method, makes level detection accurately, reliably.
In order to achieve the above object, the invention provides a kind of liquid level sensor, send primary importance signal or second place signal to external test arrangements, after described external test arrangements receives primary importance signal or second place signal, carry out corresponding predetermined action, described liquid level sensor comprises: main control unit and receiving element, carry out alternately with electromagnetic wave signal between described main control unit and receiving element, wherein:
Described main control unit further comprises:
Signal produces and sending module, is used for sending to receiving element according to predetermined policy the detection signal of predetermined strength;
Signal receiving module is used for after receiving the primary importance signal, and this primary importance signal forwarding to described external test arrangements, and is judged when not receiving the primary importance signal in the predetermined timing at interval, sends second place signal to external test arrangements;
Described receiving element comprises further:
Signal processing module after being used to receive the detection signal of sufficient intensity, sends the primary importance signal to main control unit.
Further, described detection strategy is periodically to detect strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy.
Further, described main control unit and receiving element are arranged in the closure casing according to predetermined space.
The present invention also provides a kind of liquid level sensor, send primary importance signal or second place signal to external test arrangements, after described external test arrangements receives primary importance signal or second place signal, carry out corresponding predetermined action, described liquid level sensor comprises: main control unit and receiving element, carry out alternately with electromagnetic wave signal between described main control unit and receiving element, wherein:
Described main control unit comprises further:
Signal produces and sending module, is used for sending detection signal according to predetermined policy to receiving element;
Described receiving element comprises further:
Signal processing module, after being used to receive the detection signal of sufficient intensity, send the primary importance signal to described external test arrangements, and judge when not receiving the detection signal of sufficient intensity in the predetermined timing at interval, send second place signal to external test arrangements.
Further, described detection strategy is periodically to detect strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy.
Further, described main control unit and receiving element are arranged in the closure casing according to predetermined space.
The present invention provides a kind of liquid level checking method again, comprise: the preset space length setting of being separated by is carried out mutual main control unit and receiving element with electromagnetic wave signal, when having conductive fluid medium between described main control unit and the receiving element, described receiving element can not receive the electromagnetic wave signal by the main control unit transmission of predetermined strength value; Carry out following steps then:
A. described main control unit sends the detection signal of setting intensity according to the predetermined detection strategy to receiving element;
B. after described receiving element receives the detection signal of predetermined strength value, send the primary importance signal to described outside actuating unit; When not receiving the detection signal of predetermined strength value in the predetermined timing at interval, send second place signal to described outside actuating unit;
C. after described outside actuating unit receives primary importance signal or second place signal, according to predetermined actions strategy execution corresponding actions.
Described step b comprises further:
B1. when described receiving element receives the detection signal of predetermined strength value, send the primary importance signal to described main control unit;
When b2. described main control unit receives described primary importance signal, with this primary importance signal forwarding to described outside actuating unit; In predetermined timing at interval, when described main control unit does not receive the primary importance signal, send second place signal to described outside actuating unit.
Comprise further among the described step b:
When described receiving element received the detection signal of predetermined strength value, it directly sent the primary importance signal to described outside actuating unit; When described receiving element did not receive the detection signal of predetermined strength value in predetermined timing at interval, it directly sent second place signal to described outside actuating unit.
Further, judge that the detection signal that described receiving element receives the predetermined strength value is achieved in that
Detection signal strength and the prearranged signal intensity threshold that receives compared, when detection signal strength in threshold range, judge the detection signal receive sufficient intensity; Perhaps
Described main control unit sends the coded data signal of a string length-specific with firm power to receiving element, has only data-signal to be received full-time when described receiving element, judges the detection signal that receives sufficient intensity.
Compared with prior art, the present invention has following remarkable advantage:
(1) method proposed by the invention realizes simply, and level detection accurately and reliably;
(2) device proposed by the invention can adopt structure-integrated design, does not have exposed electrode, has fundamentally stopped the etching problem of electrode, and the outside does not have moving component, and impurity blocks or the clogging sensor problem from stop at all.Be convenient under rugged surroundings, carry out level detection; And this design makes liquid level sensor prolong greatly serviceable life, has also reduced the maintenance and repair cost;
(3) it is undamped substantially that method and apparatus proposed by the invention has made full use of in the gas electromagnetic wave conduction intensity, and liquid has the principle of strong attenuation effect to electromagnetic conduction intensity, these apparatus and method are applicable to Distance Test thus, and to the test conductive fluid medium without any specific (special) requirements.
Description of drawings
Fig. 1 is the theory diagram of liquid level sensor in the embodiment of the invention;
Fig. 2 is the structural representation of the liquid level gauge of the embodiment of the invention;
Fig. 3 is the structural representation of the level switch of the embodiment of the invention;
Fig. 4 is the theory diagram of liquid level sensor in another embodiment of the present invention.
Embodiment
Design philosophy of the present invention is: utilize conducting liquid electromagnetic conduction to be had the principle of strong attenuation effect, send detection signal to receiving element with the electromagnetic wave form by the main control unit that is arranged on more than the liquid level, the detection signal that whether receives sufficient intensity according to receiving element judges whether liquid level surpasses the liquid level limiting altitude then.
Below in conjunction with the drawings and specific embodiments the present invention is done to introduce further, but not as a limitation of the invention.
With reference to shown in Figure 1, a kind of liquid level sensor, be used for sending primary importance signal or second place signal to external test arrangements, after described external test arrangements receives primary importance signal or second place signal, carry out corresponding predetermined action, described liquid level sensor comprises: main control unit and receiving element, wherein:
Described main control unit comprises further: signal generation and sending module, signal receiving module,
And signal produces and sending module, is used for sending to receiving element according to predetermined policy the detection signal of predetermined strength; This predetermined policy can be that periodicity detects strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy, perhaps other detection strategy;
Signal receiving module is used for after receiving the primary importance signal, and this primary importance signal forwarding to described external test arrangements, and is judged when not receiving the primary importance signal in the predetermined timing at interval, sends second place signal to external test arrangements;
Described receiving element comprises further: signal processing module, after being used to receive the detection signal of sufficient intensity, send the primary importance signal to main control unit, the sufficient intensity of detection signal is to determine according to distance between main control unit and the receiving element and medium in advance.
Illustrate a bit: in above mentioned liquid level sensor, the signal between main control unit and the receiving element is electromagnetic wave signal.
Accordingly, the present invention also provides a kind of liquid level checking method, the receiving element that at first will be used to detect liquid level in this method is arranged on predetermined liquid level limiting altitude, the main control unit setting that will be used to send detection signal is higher than the zone of liquid level limiting altitude, and can receive the electromagnetic wave signal that sends each other between main control unit and the receiving element in air dielectric mutually, described detection method comprises the steps:
Step 1), main control unit send the detection signal of predetermined strength to receiving element according to predetermined policy; This predetermined policy can be that periodicity detects strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy, perhaps other detection strategy;
Step 2), when receiving element is positioned at the liquid level limiting altitude when above, it will receive detection signal, and this detection signal has enough intensity, and at this moment, it sends the primary importance signal to main control unit; Otherwise receiving element will not receive the detection signal of enough intensity, not produce any respective handling thus; In this step, the sufficient intensity of detection signal is to determine according to distance between main control unit and the receiving element and medium in advance;
Step 3), when main control unit receives the primary importance signal, with this primary importance signal forwarding to external test arrangements; Judge that simultaneously the time that receives the primary importance signal with this time is in the predetermined timing at interval of starting point, whether receive the primary importance signal once more, if continue execution in step 3), otherwise, second place signal sent to external test arrangements;
Step 4) after external test arrangements receives the primary importance signal, shows that current liquid level does not reach the liquid level limiting altitude, then carry out the corresponding action that allows, after receiving second place signal, show that current liquid level surpasses the liquid level limiting altitude, then carry out the action of transfiniting accordingly.
The apparatus and method of utilizing the foregoing description to propose, can realize liquid level gauge further, its structural representation as shown in Figure 2, wherein: A is a main control unit, B is a receiving element, preferably, main control unit A and receiving element B upper and lower surface are set to the metal electro-magnetic screen layer, guarantee main control unit A thus, receiving element B can only carry out electromagnetic reception and transmission from the side, can better guarantee level detection result's accuracy, main control unit A, receiving element B can also be encapsulated in a globality, in the housing that the permission electromagnetism passes through, to realize the integraty of whole liquid level gauge.
In the embodiment of this liquid level gauge, wave is a liquid level position, as receiving element B during in " 1 " position, because spatial transmission, it can receive the detection signal of the sufficient intensity that main control unit A sends smoothly, and can send the primary importance signal to main control unit A, and as receiving element B during in " 2 " position, because liquid can not receive the detection signal of the sufficient intensity that main control unit A sends fully to the attenuation of Electromagnetic effect of transmission signals, thereby learn to be positioned under the liquid level, and then learn the position of liquid level.More preferably, can with between main control unit A and the receiving element B by can connecting with the screw mechanism that main control unit A, receiving element B all are connected, thereby adjust distance between main control unit A and the receiving element B; Can also be inboard at above-mentioned housing with the outside of main control unit A and receiving element B between the setting helicitic texture that can cooperate, with the convenient distance of adjusting between main control unit A and the receiving element B, be applicable to more that thus the liquid level limiting altitude may need the scene that changes according to actual conditions.
Figure 3 shows that the apparatus and method of utilizing the foregoing description to propose realize the structural representation of level switch further, wherein: A is a main control unit, B, C are two different receiving elements, identical with the realization principle of above-mentioned liquid level gauge, whether the A basis receives the feedback signal of receiving element B and C is judged whether liquid level arrives predetermined corresponding liquid level limiting altitude, and can realize the function of level switch thus according to judged result to the different trigger pip of outside actuating unit output.
Need to prove, in the above-mentioned embodiment that mentions, all be that main control unit A is according to whether receiving the primary importance signal that receiving element B sends in predetermined timing at interval, determine trigger pip classification to the external test arrangements transmission, in other embodiment, also can be receiving element B determines whether the trigger pip classification that sends to external test arrangements according to the detection signal that whether receives sufficient intensity in predetermined timing at interval, at this moment, described as shown in Figure 4 liquid level sensor comprises: main control unit and receiving element, wherein:
Described main control unit comprises further: signal produces and sending module, is used for sending detection signal according to predetermined policy to receiving element; This predetermined policy can be that periodicity detects strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy, perhaps other detection strategy;
Described receiving element comprises further: signal processing module, after being used to receive the detection signal of sufficient intensity, send the primary importance signal to described external test arrangements, and judge when not receiving the detection signal of sufficient intensity in the predetermined timing at interval, send second place signal to external test arrangements.
Accordingly, detection method comprises the steps:
Step 11), main control unit sends detection signal according to predetermined policy to receiving element; This predetermined policy can be that periodicity detects strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy, perhaps other detection strategy;
Step 12), when receiving element is positioned at the liquid level limiting altitude when above, it will receive detection signal, and this detection signal has enough intensity, at this moment, thus, after described receiving element receives detection signal, it sends the primary importance signal to described external test arrangements, judges that simultaneously the time that receives the primary importance signal with this time is in the predetermined timing at interval of starting point, whether receives detection signal once more, if, continue execution in step 12), otherwise, second place signal sent to external test arrangements; In this step, the sufficient intensity of detection signal is to determine according to distance between main control unit and the receiving element and medium in advance;
Step 13) after external test arrangements receives the primary importance signal, shows that current liquid level does not reach the liquid level limiting altitude, then carry out the corresponding action that allows, after receiving second place signal, show that current liquid level surpasses the liquid level limiting altitude, then carry out the action of transfiniting accordingly.
For what above-mentioned two embodiment need remark additionally a bit be: judge that the detection signal whether receiving element receives sufficient intensity can adopt following method:
(1) detection signal strength and the prearranged signal intensity threshold that receives compared, have only the described detection signal strength of working as in threshold range, just judge the detection signal that receives sufficient intensity;
(2) described main control unit sends the coded data signal of a string length-specific with firm power to receiving element, has only when described receiving element correctly receives this data-signal, judges that just it receives the detection signal of sufficient intensity.
For what the foregoing description also needed to remark additionally be: above-mentioned liquid level sensor all is that main control unit is arranged on beyond the water surface, and by receiving element on liquid level/difference that down detection signal received realizes level detection; In a further embodiment, also receiving element can be arranged on beyond the liquid level, and by main control unit on liquid level/following time, and the mutual difference of signal realizes level detection between the receiving element, this moment, implement device and method were similar to the above embodiments, did not repeat them here.In addition, to carry out corresponding actions according to predetermined strategy respectively according to different trigger pips known for those skilled in the art for mentioned external test arrangements in the foregoing description, also repeats no more at this.
Should be understood that; concerning the those of ordinary skill in field, the technology of the present invention place; can be equal to accordingly according to technical scheme of the present invention and design thereof and change or replace, and all these changes or replacement, all should belong to the protection domain of claims of the present invention.
Claims (10)
1. liquid level sensor, send primary importance signal or second place signal to external test arrangements, after described external test arrangements receives primary importance signal or second place signal, carry out corresponding predetermined action, it is characterized in that, described liquid level sensor comprises: main control unit and receiving element, carry out alternately with electromagnetic wave signal between described main control unit and receiving element, wherein:
Described main control unit further comprises:
Signal produces and sending module, is used for sending to receiving element according to predetermined policy the detection signal of predetermined strength;
Signal receiving module is used for after receiving the primary importance signal, and this primary importance signal forwarding to described external test arrangements, and is judged when not receiving the primary importance signal in the predetermined timing at interval, sends second place signal to external test arrangements;
Described receiving element comprises further:
Signal processing module after being used to receive the detection signal of sufficient intensity, sends the primary importance signal to main control unit.
2. device as claimed in claim 1 is characterized in that, described detection strategy is periodically to detect strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy.
3. device as claimed in claim 1 is characterized in that, described main control unit and receiving element are arranged in the closure casing according to predetermined space.
4. liquid level sensor, send primary importance signal or second place signal to external test arrangements, after described external test arrangements receives primary importance signal or second place signal, carry out corresponding predetermined action, it is characterized in that, described liquid level sensor comprises: main control unit and receiving element, carry out alternately with electromagnetic wave signal between described main control unit and receiving element, wherein:
Described main control unit comprises further:
Signal produces and sending module, is used for sending detection signal according to predetermined policy to receiving element;
Described receiving element comprises further:
Signal processing module, after being used to receive the detection signal of sufficient intensity, send the primary importance signal to described external test arrangements, and judge when not receiving the detection signal of sufficient intensity in the predetermined timing at interval, send second place signal to external test arrangements.
5. device as claimed in claim 4 is characterized in that, described detection strategy is periodically to detect strategy, and perhaps predetermined time interval detects strategy, perhaps external signal detection trigger strategy.
6. device as claimed in claim 5 is characterized in that, described main control unit and receiving element are arranged in the closure casing according to predetermined space.
7. liquid level checking method, it is characterized in that, comprise: the preset space length setting of being separated by is carried out mutual main control unit and receiving element with electromagnetic wave signal, when having conductive fluid medium between described main control unit and the receiving element, described receiving element can not receive the electromagnetic wave signal by the main control unit transmission of predetermined strength value; Carry out following steps then:
A. described main control unit sends the detection signal of setting intensity according to the predetermined detection strategy to receiving element;
B. after described receiving element receives the detection signal of predetermined strength value, send the primary importance signal to described outside actuating unit; When not receiving the detection signal of predetermined strength value in the predetermined timing at interval, send second place signal to described outside actuating unit;
C. after described outside actuating unit receives primary importance signal or second place signal, according to predetermined actions strategy execution corresponding actions.
8. method as claimed in claim 7 is characterized in that, described step b comprises further:
B1. when described receiving element receives the detection signal of predetermined strength value, send the primary importance signal to described main control unit;
When b2. described main control unit receives described primary importance signal, with this primary importance signal forwarding to described outside actuating unit; In predetermined timing at interval, when described main control unit does not receive the primary importance signal, send second place signal to described outside actuating unit.
9. method as claimed in claim 7 is characterized in that, comprises further among the described step b:
When described receiving element received the detection signal of predetermined strength value, it directly sent the primary importance signal to described outside actuating unit; When described receiving element did not receive the detection signal of predetermined strength value in predetermined timing at interval, it directly sent second place signal to described outside actuating unit.
10. method as claimed in claim 7 is characterized in that, judges that the detection signal that described receiving element receives the predetermined strength value is achieved in that
Detection signal strength and the prearranged signal intensity threshold that receives compared, when detection signal strength in threshold range, judge the detection signal receive sufficient intensity; Perhaps
Described main control unit sends the coded data signal of a string length-specific with firm power to receiving element, has only data-signal to be received full-time when described receiving element, judges the detection signal that receives sufficient intensity.
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| CNA2007101181108A CN101334306A (en) | 2007-06-29 | 2007-06-29 | Liquid level detector and its detection method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817331A (en) * | 2012-09-04 | 2012-12-12 | 南京赛康交通实业有限公司 | Auto-induction warning sign for ponding road segments |
| CN105675088A (en) * | 2014-11-20 | 2016-06-15 | 佛山市顺德区美的电热电器制造有限公司 | Clothes nursing machine and liquid volume detection method |
| CN107402646A (en) * | 2017-07-06 | 2017-11-28 | 深圳市华星光电技术有限公司 | Act perception device, the method and VR handles of sensed activation |
| CN107817135A (en) * | 2016-09-13 | 2018-03-20 | 中国环境科学研究院 | Rainfall runoff automatic sampling apparatus |
| CN109781212A (en) * | 2019-03-07 | 2019-05-21 | 北京锐达仪表有限公司 | A kind of electromagnetic wave level switch |
| CN109959425A (en) * | 2019-04-17 | 2019-07-02 | 北京锐达仪表有限公司 | The processing method and electromagnetic wave level switch of electromagnetic wave level switch |
| CN111380916A (en) * | 2018-12-29 | 2020-07-07 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
| CN111473837A (en) * | 2020-04-21 | 2020-07-31 | 佛山市顺德区美的饮水机制造有限公司 | Water outlet assembly, water supply equipment, liquid level detection method and readable storage medium |
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2007
- 2007-06-29 CN CNA2007101181108A patent/CN101334306A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817331A (en) * | 2012-09-04 | 2012-12-12 | 南京赛康交通实业有限公司 | Auto-induction warning sign for ponding road segments |
| CN102817331B (en) * | 2012-09-04 | 2015-03-11 | 南京赛康交通实业有限公司 | Auto-induction warning sign for ponding road segments |
| CN105675088A (en) * | 2014-11-20 | 2016-06-15 | 佛山市顺德区美的电热电器制造有限公司 | Clothes nursing machine and liquid volume detection method |
| CN105675088B (en) * | 2014-11-20 | 2019-03-22 | 佛山市顺德区美的电热电器制造有限公司 | Clothing care machine and liquid inspection method |
| CN107817135A (en) * | 2016-09-13 | 2018-03-20 | 中国环境科学研究院 | Rainfall runoff automatic sampling apparatus |
| CN107402646A (en) * | 2017-07-06 | 2017-11-28 | 深圳市华星光电技术有限公司 | Act perception device, the method and VR handles of sensed activation |
| CN111380916A (en) * | 2018-12-29 | 2020-07-07 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
| CN111380916B (en) * | 2018-12-29 | 2023-09-15 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
| CN109781212A (en) * | 2019-03-07 | 2019-05-21 | 北京锐达仪表有限公司 | A kind of electromagnetic wave level switch |
| CN109959425A (en) * | 2019-04-17 | 2019-07-02 | 北京锐达仪表有限公司 | The processing method and electromagnetic wave level switch of electromagnetic wave level switch |
| CN109959425B (en) * | 2019-04-17 | 2021-10-12 | 北京锐达仪表有限公司 | Electromagnetic wave material level switch and processing method thereof |
| CN111473837A (en) * | 2020-04-21 | 2020-07-31 | 佛山市顺德区美的饮水机制造有限公司 | Water outlet assembly, water supply equipment, liquid level detection method and readable storage medium |
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