CN110940463B - Water leakage detection method and water leakage detection device - Google Patents
Water leakage detection method and water leakage detection device Download PDFInfo
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- CN110940463B CN110940463B CN201811116237.0A CN201811116237A CN110940463B CN 110940463 B CN110940463 B CN 110940463B CN 201811116237 A CN201811116237 A CN 201811116237A CN 110940463 B CN110940463 B CN 110940463B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
Abstract
The invention relates to a water leakage detection method, which comprises the steps of obtaining an electrode characteristic reference value A of water in a water channel, and obtaining an electrode characteristic detection value B of water leakage at a water leakage detection point; calculating a difference value C of B relative to A, wherein C is B-A; and C is compared with a water leakage alarm threshold value, whether C falls into the range of the water leakage alarm threshold value is judged, and if C falls into the range of the water leakage alarm threshold value, water leakage alarm is carried out. The invention also relates to a water leakage alarm device applying the water leakage detection method, which comprises a reference electrode with two electrode probes, a detection electrode with two electrode probes, and a control circuit board electrically connected with the reference electrode and the detection electrode respectively. The reference electrode is arranged in the water path, and the detection electrode is arranged at the water leakage detection position. The water leakage detection method and the water leakage detection device can effectively distinguish condensate water from water leakage, avoid false water leakage alarm, enable water leakage alarm to be more accurate, reduce maintenance work and enable use to be more humanized.
Description
Technical Field
The invention relates to a water leakage detection method and a water leakage detection device applying the water leakage detection method.
Background
At present, a water leakage detection device is usually arranged in an article provided with a water passing pipeline so as to be used for detecting the water leakage condition inside the article and further facilitate timely treatment. All be provided with the detection device that leaks in electrical apparatus such as current radiator, water heater, air conditioner, washing machine, water purifier, and then convenience of customers in time acquires the condition of leaking of articles for use, and then takes effective measure, avoids causing the loss. For example, the disclosed water leakage detection module can be installed in various products having water pipes, such as the chinese utility model patent with the publication number CN204422154U (application number 201520048744.0). The water leakage detection module comprises a detection electrode and a detection circuit, wherein the detection electrode comprises a first detection electrode and a second detection electrode, and when the water leakage detection module is used, the first detection electrode and the second detection electrode can be conducted in water under the condition of water leakage, so that the water leakage condition can be detected. Chinese utility model patent "a water purifier" of grant publication number CN206613254U (application number CN201720150264.4), wherein the water purifier of disclosing include the casing with set up in the detection component that leaks of casing bottom, the detection component that leaks include the pick-up plate and the interval set up in first electrode and second electrode on the pick-up plate, all be provided with the electrode bar on first electrode and the second electrode. When water leaks outwards from different positions of the bottom plate of the shell, the electrode rods 23 uniformly distributed on the first electrode 21 and the second electrode 22 can detect the water leakage, and then the water leakage alarm is carried out.
The water leakage detection devices detect water leakage through the conduction of the two electrodes, but in the use process of some articles, condensate water also occurs, and the occurrence of the condensate water is not the problem of the failure of the articles, and generally does not require water leakage alarm work. If the water leakage detection device is adopted, the water leakage alarm can be carried out under the condition that condensed water appears, and the false alarm condition of the condensed water can often appear.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a water leakage detection method capable of accurately performing a water leakage alarm in view of the above prior art.
The second technical problem to be solved by the present invention is to provide a water leakage detection device capable of effectively distinguishing between condensate and water leakage, thereby avoiding false alarm of condensate.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a water leakage detection method is characterized in that: comprises the following steps
A water leakage detection method is characterized in that: comprises the following steps
S1, acquiring an electrode characteristic reference value A of water in the water channel and acquiring an electrode characteristic detection value B of water leakage at a water leakage detection point;
s2, calculating a difference value C of B relative to A, wherein C is B-A;
and S3, comparing the C with a water leakage alarm threshold value, judging whether the C falls into the range of the water leakage alarm threshold value, and if so, performing water leakage alarm.
In order to perform effective early warning in case of slight water leakage, in S3, if C does not fall within the threshold range of water leakage warning, S4 is performed;
s4, calculating a change Δ C of the current difference value C with respect to the difference value C0 obtained in the previous calculation, where Δ C is | C-C0 |;
and judging the change trend of the delta C, and if the delta C is in a decreasing trend, carrying out water leakage early warning prompt.
In order to reduce the calculated amount of control, in S4, the current Δ C is compared with Δ C0 calculated last time, if Δ C < Δ C0, the accumulation count is performed, if otherwise, the accumulation count is cleared and returned to S1;
and when the accumulated count reaches a set effective early warning time threshold, judging that the delta C is in a decreasing trend, and further performing early warning prompt of water leakage.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a water leakage detection device is characterized in that: comprises that
The reference electrode comprises two electrode probes and is arranged in the water path;
the detection electrode comprises two electrode probes and is arranged at the water leakage detection position;
the control circuit board is electrically connected with the reference electrode and the detection electrode respectively and is used for comparing detection signals of the reference electrode and the detection electrode and outputting a water leakage detection signal;
one electrode probe of the reference electrode is electrically connected with one input end of the control circuit board, and the other electrode probe of the reference electrode is grounded;
one electrode probe of the detection electrode is electrically connected with the other input end of the control circuit board, and the other electrode probe of the detection electrode is grounded.
The control circuit board comprises a first detection circuit, a second detection circuit and a controller, wherein the input end of the first detection circuit is electrically connected with the electrode probe of the reference electrode, the input end of the second detection circuit is electrically connected with the electrode probe of the detection electrode, and the output ends of the first detection circuit and the second detection circuit are respectively electrically connected with the controller.
In order to facilitate water leakage prompt, the control circuit board further comprises a display lamp and/or a buzzer which are electrically connected with the controller.
Preferably, the first detection circuit comprises a first resistor and a second resistor, a first end of the first resistor is connected with the power supply, a second end of the first resistor is electrically connected with the electrode probe of the reference electrode, a first end of the second resistor is electrically connected with a second end of the first resistor, and a second end of the second resistor is electrically connected with one signal input end of the controller;
the second detection loop comprises a third resistor and a fourth resistor, the resistance of the third resistor is larger than or equal to that of the first resistor, the resistance of the fourth resistor is equal to that of the second resistor, the first end of the third resistor is connected with the power supply, the second end of the third resistor is electrically connected with the electrode probe of the reference electrode, the first end of the fourth resistor is electrically connected with the second end of the third resistor, and the second end of the fourth resistor is electrically connected with the other signal input end of the controller.
Preferably, the number of the detection electrodes is at least two, and each detection electrode is electrically connected with the control circuit board respectively.
Conveniently, still be provided with the setting key of being connected with control circuit board electricity on the casing.
Compared with the prior art, the invention has the advantages that: in the water leakage detection method, the electrode characteristic reference value of water in the normal water path is compared with the electrode characteristic detection value of water leakage at the water leakage detection point, and then whether water leakage occurs is judged, namely, under the condition that condensed water occurs at the water leakage detection point, the difference between the electrode characteristic reference value of water in the normal water path and the electrode characteristic detection value of water leakage at the water leakage detection point is larger, at the moment, water leakage alarm is not needed, and only when water leakage occurs at the water leakage detection point, water leakage alarm is needed. Therefore, condensate water and real water leakage conditions can be effectively distinguished, and false alarm is avoided. This detection device leaks, place reference electrode in the water route, thereby detect the water route water and switch on the signal under this reference electrode, set up detection electrode at the position of leaking simultaneously, so under the condition that detection electrode is switched on by water, can compare detection electrode's detection signal and reference electrode's signal, the comparison result can be effectual differentiation be condensate water to the condition of the position of leaking or the condition that the device appears leaking, it is more accurate to leak water and report to the police, maintenance work has been reduced, it is more convenient to use.
Drawings
Fig. 1 is a flowchart illustrating a water leakage detection method according to an embodiment of the present invention.
Fig. 2 is a block diagram of a water leakage detection device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The water leakage detection device in the embodiment can be applied to various products which are provided with water paths and need to detect the water leakage condition, such as a water purifier.
As shown in fig. 2, the water leakage detection device in this embodiment includes a reference electrode 1, a detection electrode 2, and a control circuit board 3. The reference electrode 1 and the detection electrode 2 each include two electrode probes.
The reference electrode 1 is disposed in the water path in this embodiment. When applied in a water purifier, the reference electrode 1 may employ a TDS sensor in the water purifier. The two electrode probes of the reference electrode 1 are always kept in a communicated state under the action of water in a water channel, water between the two electrode probes forms a certain equivalent resistance, the equivalent resistance formed by the water between the two electrode probes fluctuates along with changes due to different water qualities in different regions, and in the embodiment, the equivalent resistance formed by the water between the two electrode probes is recorded as Rw。
The detection electrode 2 is arranged at a water leakage detection position, and the water leakage detection position is usually positioned at the bottom of the water purifier, namely two electrode probes of the detection electrode 2 are arranged at the water leakage detection position at the bottom of the water purifier. The number of the detection electrodes 2 is determined according to the number of the water leakage detection positions, that is, one detection electrode 2 is provided for each water leakage detection position. The detection electrode 2 may also be placed at a sensitive leak point. The water purifier can produce the comdenstion water when work, and when the comdenstion water fell in the water purifier bottom, the condition of leaking did not appear in the inside device of water purifier, need not to leak water and reports to the police under this kind of condition. Only under the condition that the device in the water purifier is not sealed tight or damaged and leak water, the water leakage alarm needs to be carried out, and then the user is reminded to maintain, and the safety problem caused by larger damage is avoided.
The control circuit board 3 is electrically connected with the reference electrode 1 and the detection electrode 2 respectively, and is used for comparing and calculating detection signals of the reference electrode 1 and the detection electrode 2, and then corresponding detection signals. The control circuit board 3 includes a first detection circuit 31, a second detection circuit 32, a controller 33 and an alarm device, wherein the controller 33 may be a single-chip microcomputer. The input terminal of the first detection circuit 31 is electrically connected to one electrode probe of the reference electrode 1, and the other electrode probe of the reference electrode 1 is grounded. The input end of the second detection circuit 32 is electrically connected to the electrode probe of the detection electrode 2, and the other electrode probe of the detection electrode 2 is grounded. The output ends of the first detection circuit 31 and the second detection circuit 32 are electrically connected to the controller 33. The alarm device can adopt a display lamp 4 and/or a buzzer 5, and is electrically connected with the output end of the controller 33. The power connection terminal of the controller 33 has one end connected to the power supply and the other end grounded.
Specifically, the first detection circuit 31 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to the power supply, a second end of the first resistor R1 is electrically connected to the electrode probe of the reference electrode 1, a first end of the second resistor R2 is electrically connected to a second end of the first resistor R1, and a second end of the second resistor R2 is electrically connected to one signal input terminal of the controller 33.
The second detection circuit 32 includes a third resistor R3 and a fourth resistor R4, the resistance of the third resistor R3 is greater than or equal to the resistance of the first resistor R1, the resistance of the fourth resistor R4 is equal to the resistance of the second resistor R2, the first end of the third resistor R3 is connected to the power supply, the second end of the third resistor R3 is electrically connected to the electrode probe of the reference electrode 1, the first end of the fourth resistor R4 is electrically connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is electrically connected to the inverting input terminal of the controller 33. In this embodiment, the resistance of the third resistor R3 is greater than the resistance of the first resistor R1. The resistance of the third resistor R3 is adjusted according to the sensitivity of the water leakage detecting device, but if the resistance of the third resistor R3 is determined, the detection sensitivity of the water leakage detecting device is determined. The smaller the resistance of the third resistor R3, the higher the sensitivity.
For the purpose of description, the voltage at the second terminal of the first resistor R1 is defined as V1, the voltage at the second terminal of the third resistor R3 is defined as V2, and the power supply voltage is VCC.
The reference electrode 1 is connected into water, so that the two electrode probes of the reference electrode 1 are connected together by tap water to form a loop, and the voltage value of V1 is the equivalent resistance R of water between the first resistance R1 and the probe of the reference electrode 1wI.e. V1-VCC Rw/(Rw+ R1), corresponding V1<VCC。
Normally, the water leakage detection position in the water purifier is water-free, that is, the two electrode probes of the detection electrode 2 are not conducted, and V2 is VCC, and V2> V1. At this time, the controller 33 converts the current data passing through the second resistor R2 and the fourth resistor R4 into water conductivity data, and then compares and calculates the water conductivity data corresponding to the detection electrode 2 with the conductivity data of the water obtained by the reference electrode, at this time, the difference calculated by the controller inevitably exceeds the preset water conductivity difference threshold corresponding to the water leakage alarm, and at this time, the controller 33 controls not to perform the alarm operation, that is, the display lamp 4 is not on, and the buzzer 5 does not sound.
When the condensed water falls to the water leakage detection position, since the condensed water is pure water or close to pure water, the equivalent resistance R of the condensed water between the two electrode probes of the detection electrode 2 is much larger than that of water between the two electrode probes of the reference electrode 1. Therefore, V2 ≈ VCC, when V2> V1. The controller 33 converts the voltage signal into water conductivity data, and compares the water conductivity data with conductivity data of water obtained by the reference electrode, at this time, the difference value calculated by the controller still does not exceed the preset water conductivity difference value threshold corresponding to the water leakage alarm, and the controller 33 controls not to perform the alarm action at this time, namely, the display lamp 4 is not lighted, and the buzzer 5 does not sound.
When water in the water path falls to the water leakage detection position, namely under the condition of real water leakage, the two electrode probes of the detection electrode 2 are immersed, and the equivalent resistance R of the water between the two electrode probes of the detection electrode 2 is approximately equal to RwHowever, since R3 > R1 and R2 ═ R4, V2<V1, the controller 33 converts the current data through the second resistor R2 and the fourth resistor R4 into water conductivity dataAnd then comparing and calculating the water conductivity data corresponding to the detection electrode 2 with the water conductivity data obtained by the reference electrode, wherein the difference calculated by the controller 33 inevitably exceeds the set water conductivity difference threshold corresponding to the water leakage alarm, and the controller 33 controls the display lamp 4 to be turned on and the buzzer 5 to sound at the moment to prompt the water leakage condition. The threshold value of the difference of the conduction rates of the water set in the controller 33 can be adjusted by setting the setting key 6, so that the water leakage sensor can be conveniently applied to different water leakage sensitivity environments.
As shown in fig. 1, the water leakage detection method of the water leakage detection apparatus in this embodiment includes the following steps:
s1, the controller obtains an electrode characteristic reference value a of water corresponding to the reference electrode 1 in the water path, where a is a current value passing through the second resistor R2 in this embodiment, the controller obtains a water leakage electrode characteristic detection value B corresponding to the detection electrode at the water leakage detection point, where B is a current value passing through the fourth resistor R4 in this embodiment; the data acquisition frequency can be set according to requirements, for example, the data can be detected and acquired once every second;
s2, the controller calculates a difference value C between B and a, where C is B-a; the water leakage detection device is applied to different regions, B is relatively different, and meanwhile, the water quality in the product also changes dynamically, so that B is a dynamic value, and when comparison is carried out, the obtained comparison result is compared according to the real-time electrode characteristics of water in the water path, and the comparison result is more accurate;
s3, the controller compares C with a water leakage alarm threshold, if the water leakage alarm threshold can be set to 0, whether C falls within the range of the water leakage alarm threshold is judged, namely when C is less than or equal to 0, the water leakage condition is considered to occur; if C is in the threshold range of water leakage alarm, the controller judges that water leakage occurs, and then water leakage alarm is carried out; if C does not fall within the threshold range of the water leakage alarm, S4 is carried out;
s4, the controller calculates a change Δ C of the current difference value C relative to the difference value C0 obtained in the previous calculation, where Δ C is | C-C0 |;
in order to judge the change trend of the delta C, the delta C data can be drawn into a delta C change curve, the controller judges the change trend of the delta C change curve, if the delta C is in a decreasing trend, namely the data B gradually approaches to the data A, the water leakage in the water channel is indicated to be gradually increased to the water leakage detection positions, and then the water leakage early warning prompt is carried out;
in order to facilitate quick determination and reduce the calculation amount of the controller, the method for determining the variation trend of Δ C in this embodiment is as follows: comparing the current delta C with the delta C0 calculated last time, if the delta C is less than the delta C0, performing accumulated counting, and if not, clearing the accumulated counting and returning to S1;
when the accumulated count reaches the set effective early warning time threshold, the Δ C is judged to be in a decreasing trend, and then water leakage early warning prompt is carried out, wherein the effective early warning time threshold can be set to be 5 times.
Through the water leakage detection method, the condensate water and the water leakage condition can be effectively distinguished, the condition of water leakage false alarm under the condensate water condition is avoided, the alarm information is more accurate, the overhaul work is reduced, and the use is more humanized. In addition, the water leakage condition can be pre-alarmed, water leakage early warning is carried out under the condition that slight water leakage occurs in the early stage, the change trend of water leakage increase is effectively prompted, a user is prompted to carry out timely treatment, and the deterioration of the later stage water leakage condition is avoided. Meanwhile, a user can select to process or not to process when the pre-alarm occurs according to different requirements of the product on the leakage condition, and the maintenance cost budget is conveniently calculated.
Claims (8)
1. A water leakage detection method is characterized in that: comprises the following steps
S1, acquiring an electrode characteristic reference value A of the water in the water channel, and acquiring an electrode characteristic detection value B of water leakage at a water leakage detection point, wherein the B is a dynamic value which dynamically changes along with the water quality of the water in the water channel;
s2, calculating a difference value C of B relative to A, wherein C = B-A;
s3, comparing C with the water leakage alarm threshold value, judging whether C falls into the water leakage alarm threshold value range, if so, performing water leakage alarm; if C does not fall within the threshold range of the water leakage alarm, S4 is carried out;
s4, calculating a change value delta C of the current difference value C relative to the difference value C0 obtained in the previous calculation, wherein delta C = | C-C0 |;
and judging the change trend of the delta C, and if the delta C is in a decreasing trend, carrying out water leakage early warning prompt.
2. The water leakage detection method according to claim 1, wherein: in S4, comparing the current Δ C with the Δ C0 calculated in the previous time, if the Δ C is less than the Δ C0, performing cumulative counting, and if not, clearing the cumulative counting and returning to S1;
and when the accumulated count reaches a set effective early warning time threshold, judging that the delta C is in a decreasing trend, and further performing early warning prompt of water leakage.
3. A water leakage alarm device to which the water leakage detection method according to claim 1 or 2 is applied, characterized in that: comprises that
A reference electrode (1) comprising two electrode probes, arranged in the water path;
the detection electrode (2) comprises two electrode probes and is arranged at the water leakage detection position;
the control circuit board (3) is electrically connected with the reference electrode (1) and the detection electrode (2) respectively and is used for comparing detection signals of the reference electrode (1) and the detection electrode (2) and outputting a water leakage detection signal;
one electrode probe of the reference electrode (1) is electrically connected with one input end of the control circuit board (3), and the other electrode probe of the reference electrode (1) is grounded;
one electrode probe of the detection electrode (2) is electrically connected with the other input end of the control circuit board (3), and the other electrode probe of the detection electrode (2) is grounded.
4. The water leak warning device according to claim 3, wherein: the control circuit board (3) comprises a first detection circuit (31), a second detection circuit (32) and a controller (33), wherein the input end of the first detection circuit (31) is electrically connected with the electrode probe of the reference electrode (1), the input end of the second detection circuit (32) is electrically connected with the electrode probe of the detection electrode (2), and the output ends of the first detection circuit (31) and the second detection circuit (32) are respectively electrically connected with the controller (33).
5. The water leak warning device according to claim 4, wherein: the control circuit board (3) further comprises a display lamp (4) and/or a buzzer (5) which are electrically connected with the controller (33).
6. The water leakage alarm device according to claim 4, wherein: the first detection circuit (31) comprises a first resistor (R1) and a second resistor (R2), wherein a first end of the first resistor (R1) is connected with a power supply, a second end of the first resistor (R1) is electrically connected with an electrode probe of the reference electrode (1), a first end of the second resistor (R2) is electrically connected with a second end of the first resistor (R1), and a second end of the second resistor (R2) is electrically connected with one signal input end of the controller (33);
the second detection circuit (32) comprises a third resistor (R3) and a fourth resistor (R4), the resistance value of the third resistor (R3) is larger than or equal to that of the first resistor (R1), the resistance value of the fourth resistor (R4) is equal to that of the second resistor (R2), the first end of the third resistor (R3) is connected with the power supply, the second end of the third resistor (R3) is electrically connected with the electrode probe of the reference electrode (1), the first end of the fourth resistor (R4) is electrically connected with the second end of the third resistor (R3), and the second end of the fourth resistor (R4) is electrically connected with the other signal input end of the controller (33).
7. The water leakage alarm device according to claim 3, wherein: the number of the detection electrodes (2) is at least two, and each detection electrode (2) is electrically connected with the control circuit board (3) respectively.
8. The water leak warning device according to claim 3, wherein: the control circuit board (3) is also electrically connected with a setting key (6).
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