CN102147271A - Differential pressure flowmeter and domestic water-leakage protection system thereof - Google Patents
Differential pressure flowmeter and domestic water-leakage protection system thereof Download PDFInfo
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- CN102147271A CN102147271A CN 201110005296 CN201110005296A CN102147271A CN 102147271 A CN102147271 A CN 102147271A CN 201110005296 CN201110005296 CN 201110005296 CN 201110005296 A CN201110005296 A CN 201110005296A CN 102147271 A CN102147271 A CN 102147271A
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- 238000005259 measurement Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 5
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Abstract
The invention discloses a differential pressure flowmeter and a domestic water-leakage protection system thereof. The differential pressure flowmeter disclosed by the invention comprises a shell, wherein the shell is provided with an inner cavity, a water inlet channel and a water outlet channel, wherein the water inlet channel and the water outlet channel are communicated with the inner cavity, and the axis of the water inlet channel and the axis of the water outlet channel are vertical to each other; and the inner cavity is further internally provided with a piston capable of reciprocating along the axis of the water inlet channel so as to change the communication section area between the water inlet channel and the water outlet channel, and one end of the piston is connected with a pressure transmitter through an elastic assembly. In the invention, the domestic water-leakage protection system constituted by the differential pressure flowmeter further comprises a microprocessor with a timer, and the system can be used for finding out a water leakage point of a pipeline in time and rapidly analyzing and cutting off the connection between the water leakage point and a supply source so as to reduce losses to a maximal extent. The differential pressure flowmeter and the system thereof, disclosed by the invention, have the advantages of simple structure, accuracy in measurement, stable and reliable performance, strong practicability and the like.
Description
Technical field
The present invention relates to a kind of flow measurement device, especially relate to a kind of differential flowmeter and family expenses thereof the guard system that leaks.
Background technology
In people's daily life, owing to easy breakage of long water pipeline or user carelessness service time not fully reason such as the off switch phenomenon that causes leaking happen occasionally.Leaking makes that furniture, equipment, equipment in the buildings are soaked, especially very big to the infringement of woodworks such as furniture, floor, has a strong impact on its serviceable life, and pipe leakage very easily causes electrical leakage simultaneously, and people's life security is threatened.Along with people to household safely, problem such as economize on resources is more and more paid attention to, and is to reduce the loss that pipe leakage causes, and avoids potential safety hazard, need fix a point to detect to the water pipeline, so that in time find the water leakage fault point, loss is dropped to minimum.At present, the flow that is used for fluid measurement and field of detecting utilizes the pressure reduction principle to realize that flow metering also is technological means comparatively commonly used in this area in respect of a lot, and reliability is low, sensitivity is not high, locate problems such as inaccurate but ubiquity is measured.
Summary of the invention
The objective of the invention is to overcome shortcoming of the prior art with not enough, proposed a kind of simple in structure, measure differential flowmeter accurately and reliably, and a kind of family expenses that utilize differential flowmeter of the present invention guard system that leaks has been proposed.Utilize differential flowmeter of the present invention and the family expenses guard system that leaks can in time find the pipe leakage phenomenon that caused by unpredictable factor, the rapid evaluation extent of injury is separated faulty component from piping system, loss is reduced to minimum.
In one aspect of the invention, a kind of differential flowmeter comprises a housing, and this housing is provided with an inner chamber, and the intake tunnel and the exhalant canal that are communicated with inner chamber, and the axis of described intake tunnel is vertical mutually with the axis of exhalant canal; Also be provided with one in the described inner chamber and can move back and forth along the axis of intake tunnel to change the piston that is communicated with area of section between intake tunnel and the exhalant canal, an end of this piston is connected with a pressure unit by an elastic parts.
As preferably, the fixedly connected area of section of above-mentioned piston one end is greater than the seal of intake tunnel area of section, and the sealing part can closely seal intake tunnel.
Further, the area of section of above-mentioned inner chamber is greater than the intake tunnel area of section.
As preferably, above-mentioned intake tunnel equates with the area of section of exhalant canal.
Further, above-mentioned elastic parts is made up of spring base and spring, and spring mounts elastically and is connected with piston, and spring base is connected with pressure unit.
As preferably, above-mentioned spring is a compression spring.
Further, above-mentioned differential flowmeter comprises also with housing and cooperates installation end cover that described pressure unit is installed on the end cap, also is provided with O-ring seal in the installation junction of this end cap and housing, in case stopping leak leaks.
In another aspect of the present invention, utilize the family expenses of the differential flowmeter of the present invention guard system that leaks, it comprises: differential flowmeter of the present invention, the microprocessor that has timer, electromagnetic valve, alarm and conduit pipeline, described differential flowmeter and electromagnetic valve are installed in series on conduit pipeline, microprocessor receives the signal that differential flowmeter transmits, and control alarm and electromagnetic valve.
Further, said system also comprises the display that is connected with microprocessor, and described display is the water consumption display, is used for the discharge that explicit user uses.
As preferably, said system also comprises a manually-operated gate, and this manually-operated gate is installed in parallel on conduit pipeline, is used for interim water supply.
With respect to prior art, differential flowmeter of the present invention utilizes differential pressure principle and NE BY ENERGY TRANSFER principle, can in time the fluid flow of this device of flowing through be exported with electrical signal form, realizes the monitoring to user's discharge.The family expenses of the present invention guard system that leaks can in time be found the pipe leakage zone, and express-analysis is also cut off leakage region and the getting in touch of watering, and reduces loss to greatest extent.The family expenses of the present invention guard system that leaks can not only can also be measured water meter as digital and electronic as the family expenses water leakage alarm, the dynamically displaying user water consumption, thus realize the programme-controlled and unmanned management of meter reading.
In order to understand the present invention more clearly, set forth the specific embodiment of the present invention below with reference to description of drawings.
Description of drawings
Fig. 1 is the inner structure synoptic diagram of the embodiment of the invention 1 differential flowmeter.
Fig. 2 is the leak composition structural drawing of guard system of the embodiment of the invention 2 family expenses.
Fig. 3 is the leak operational flow diagram of guard system of the embodiment of the invention 2 family expenses.
Fig. 4 is the leak composition structural drawing of guard system of the embodiment of the invention 3 family expenses.
Embodiment
Embodiment 1
See also Fig. 1, differential flowmeter of the present invention comprises a cylindrical shell 1, this housing 1 has a cylindric inner chamber 2, and the cylindric intake tunnel 21 and the cylindric exhalant canal 22 that are communicated with inner chamber 2, and the axis of this intake tunnel 21 is vertical mutually with the axis of exhalant canal 22.In the present embodiment, the circular section diameter of inner chamber 2 is greater than the circular section diameter of intake tunnel 21, and intake tunnel 21 equates with the circular section area of exhalant canal 22.This differential flowmeter also comprises with housing 1 and cooperates installation end cover 11, is convenient to dismantle or install the assembly in the inner chamber 2, also is provided with O-ring seal between end cap 11 and the housing 1, is tightly connected to guarantee the two.Also being provided with one in the inner chamber 2 can move back and forth along the axis of intake tunnel 21 to change the piston that is communicated with area of section 3 between intake tunnel 21 and the exhalant canal 22, one end of this piston 3 is connected with a pressure unit 5 by an elastic parts 4, and this pressure unit 5 is installed on the end cap 11.The fixedly connected rounded seal 31 of the other end of piston 3, the circular section diameter of sealing part 31 is greater than the circular section diameter of intake tunnel 21, when making seal 31 and intake tunnel 21 close mutually, can closely seal intake tunnel 21, simultaneously, the circular section diameter of sealing part 31 is again less than the circular section diameter of inner chamber 2, make between the chamber wall of the edge of seal 31 and inner chamber 2 and leave the slit, this slit is the bigger the better, this makes seal 31 be easy to move in inner chamber 2 on the one hand, on the other hand, when seal 31 leaves and opens intake tunnel 21, current can be in time by this slit flow to exhalant canal 22.The circular section area of piston 3 is less than the circular section area of seal 31.In the present embodiment, elastic parts 4 is made up of spring base and spring, and spring mounts elastically and is connected with piston 3 and pressure unit 5 respectively, and this spring is a compression spring.When fluid was in static balancing, this piston 3 can seal intake tunnel 21 by seal 31; When piston 3 in inner chamber 2 along its axis when reciprocating, intake tunnel 21 changes with the area of section that is communicated with between the exhalant canal 22 thereupon, the discharge of this device of promptly flowing through also changes thereupon, and at this moment, the pressure that sends pressure unit 5 by spring to also can change.The output terminal of pressure unit 5 is connected to pair of positive and negative 6, and the pressure signal that is used for bearing is converted to electric signal and exports follow-up equipment to.
Differential flowmeter of the present invention is installed in series to the domestic water pipeline, and its duty is described as follows:
When anhydrous when mobile in the pipeline, in the pipeline everywhere pressure equate to be in equipoise, the seal 31 of this differential flowmeter closely seals intake tunnel 21, intake tunnel 21 is not communicated with exhalant canal 22, no fluid flows through this device.
When there are flowing out in the pipeline, (comprise normal use and pipe leakage), owing to there is pressure differential, piston 3 is subjected to displacement under pressure, make elastic parts 4 compression and elastic potential energy is passed to pressure unit 5, pressure unit 5 converts its pressure that bears to voltage signal output linearly, and output voltage can calculate according to formula (1):
U＝K
1·F
1＝K
1·K
2·ΔL (1)
Wherein, K
1Be the pressure inverting coefficient, by the material decision of this pressure unit, K
2Be the elasticity coefficient of spring, Δ L is the variable quantity of telescopic spring.Spring is to the elastic acting force F of pressure unit
1With the pressure F of current to piston 3
2Equal and opposite in direction, direction is identical, and water flow pressure can be calculated according to formula (2):
F
1＝F
2＝mv/t＝q·t·v/t＝q·v (2)
Wherein, m is the total water current amount that acts on the piston 3, and q is the discharge that flows through intake vent 21 in the unit interval, and v is a water velocity, and t is action time.
The motion of piston 3 makes seal 31 open intake tunnel 21 immediately, and fluid flows into this differential flowmeter by intake vent 21, and by the slit between seal 31 edges and the inner chamber 2 chamber walls, flows to exhalant canal 22.At this moment, discharge q satisfies formula (3):
q＝2πr·ΔL·v (3)
R is the xsect radius of intake tunnel 21.
According to above-mentioned formula (1)～(3), can derive the output voltage U of pressure unit 5 and the relation between the discharge q in the unit interval:
Wherein, after the differential flowmeter product approval, K
1, K
2, r value by the decision of material and technology, so COEFFICIENT K is constant, promptly the output voltage U of pressure unit 5 is proportional with the flow q that flows through this differential flowmeter.
Along with the increase of pressure, the displacement of piston 3 increases gradually, and flow q is also along with increase, and the output voltage U of pressure unit 5 also increases thereupon.
When the complete decompression in downstream or when producing negative pressure, under the acting in conjunction of the pressure of elastic parts 4 and upstream pressure, promote piston 3 and produce displacements, block fluid return path, make fluid can't pass through this device, play by the backflow effect.Therefore, when emergency occurring, need only the nearest watering in timely disengagement failure point downstream, can realize immediately the trouble spot being separated from system, to reduce the possibility that accident enlarges.
Be example with the household water leakage guard system below, specify the application of apparatus of the present invention and system thereof.
See also Fig. 2, the family expenses of the present invention guard system that leaks comprises: conduit pipeline 100, differential flowmeter 101, microprocessor 102, alarm 103, electromagnetic valve 104 and manually-operated gate 105, differential flowmeter 101 and electromagnetic valve 104 all are installed in series in conduit pipeline 100.The pressure differential that differential flowmeter 101 is given birth to current movable property in the detected conduit pipeline 100 is converted into electric signal and exports microprocessor 102 to, microprocessor 102 is by its built-in timer (shown in Fig. 2) monitoring water time, thereby whether the operating position of judging conduit pipeline 100 is normal.This system also comprises the manually-operated gate 105 that is installed in parallel with conduit pipeline 100.
No matter have a shower, cook, do washing in daily life, the water time is not continuously, and most of people are about 10～30 minutes at each time of using continuously, and system of the present invention has in view of the above preestablished the reasonable time T of water
1And the duration T of alarm
2When the actual used water time T surpasses default reasonable use of water time T
1The time, system start-up alarm 103, whether prompting user whether off switch, switch closes, should note items such as using water wisely tight; When if the user does not take any action, in case the water time T continues to be added to and surpasses default reasonable use of water time T
1With default warning time T
2Sum then is judged to be pipe leakage or switch does not cut out, and the automatic opens solenoid valve door 104 of system cuts off watering, avoids causing bigger loss.When in time not repairing, system can adopt manually-operated gate 105 to supply water temporarily.The reasonable time and the alarm duration of water can be set flexibly according to the habits and customs of each family in actual use, and the wherein default reasonable use of water time was advisable with 10～30 minutes, and default time of fire alarming was with 1～3 minute the best.Alarm 103 is selection sound or light or the dual-purpose warning device of acousto-optic according to actual needs.
Fig. 3 has shown the leak process flow diagram of microprocessor control in the guard system of family expenses of the present invention, may further comprise the steps:
Step S1: whether the output voltage values of judging differential flowmeter 101 promptly judges whether intake tunnel with exhalant canal be communicated with greater than zero, if yes, shows to there are flowing out this differential flowmeter 101, enters next step S2; If, then do not jump to step S5.
Step S2: the timer in the microprocessor 102 picks up counting, and writes down disposable continuous actual used water time T; Judge that simultaneously whether this disposable continuous actual used water time T is greater than default reasonable use of water time T
1If not, then return step S1; If yes, then enter next step S3.
Step S3: start alarm 103 and send warning, timer continues timing simultaneously; Continue to judge whether the disposable continuous water time T of user surpasses default reasonable use of water time T
1With default warning time T
2Sum is if not, then return step S1; If yes, then enter next step S4.
Step S4: start electromagnetic valve 104 and cut off conduit pipeline 100 water supply, disconnect watering.
Step S5: the timer zero clearing resets, and alarm stops to give the alarm.
When unmanned in the house or unmanned water and water pipe did not have leakage, the current in the conduit pipeline 100 remained static, and differential flowmeter 101 records anhydrous flowing through, and its output voltage values is zero, and the timers in the microprocessor 102 are not worked.
When having water to flow in the conduit pipeline 100, may be that the user normally uses, also may be leaking appears in conduit pipeline 100.When output voltage values greater than zero the time, differential flowmeter 101 records flow value, showing has current to flow through, the timer in the microprocessor 102 picks up counting, and constantly with default reasonable use of water time T
1Compare.
When in default reasonable use of water time T
1Record discharge in the scope and return back to zero, promptly differential flowmeter 101 output voltage values are zero, show it is normal water, and microprocessor 102 sends instruction, stop the timer timing and are reset to zero, wait for next timing.
When current accumulation T service time that flows through differential flowmeter 101 surpasses default reasonable use of water time T
1The time, alarm 103 can be reported to the police automatically, and reminding within doors, personnel note following situation:
A) if just at water, then remind user's water time oversize, note saving; Continue water as need, temporarily moment off switch, the output voltage values that makes differential flowmeter is zero, forces timer and resets, and pick up counting again, continues use then.
B) if forget and close opened switch, then remind the user to close.
C) if incomplete off switch still has water to flow, then remind the user to fasten.
When above work a), b), c) at default time of fire alarming T
2Finish with interior, do not leak if system has, then flow through the discharge vanishing at once of differential flowmeter, promptly output voltage values is zero, and timer stops timing and resets at this moment; Alarm stops to report to the police.
When at default time of fire alarming T
2In when not taking any measure, may be unmanned within doors or system drainage is arranged, system will start the watering that electromagnetic valve 104 cuts off conduit pipelines 100 automatically, stop to supply water, thereby anti-sealing excess flow lose, avoid producing further harm.
When system does not in time repair, can adopt manually-operated gate 105 to supply water temporarily, make the usefulness of emergency water supply.
See also Fig. 4, according to formula (4) as can be known, the pressure unit output voltage U is directly proportional with the flow q that flows through this differential flowmeter, and therefore, microprocessor 102 is according to output voltage values U
tCan calculate flow q
t, be that flow value in the Δ t adds up with Measuring Time, can calculate the total water consumption Q of user according to following formula (5):
And on water consumption display 106, show, thereby realize the electronic water meter function.
Further, user's water value Q that can this is above-mentioned is stored in the storer of microprocessor 102, or regularly is sent to backstage control center, can realize unmanned meter reading or remote meter reading.
If need carry out trunk line when monitoring, according to flowing out and flow into equal principle, in the different test points of the water supply line of monitoring a plurality of embodiment 3 described family expenses guard system that leaks is installed, and will be preset the reasonable use of water time T
1With default warning time T
2Transfer to infinity, at this moment, only need user's water value that certain fixed point is shown constantly and all the other each fixed points compare, can judge and whether have drainage in this section water supply line, also can find simultaneously the order of severity of the situation of leaking intuitively, and the prompting user takes corresponding measure to safeguard.
With respect to prior art, differential flowmeter of the present invention is simple in structure, utilize differential pressure principle and NE BY ENERGY TRANSFER principle, promoting spring by the mobile pressure that produces of fluid shrinks, and the elastic potential energy of corresponding generation further is passed to pressure unit, be converted to electric signal through pressure unit and export the subsequent control unit to, thereby realization is to the monitoring of the fluid flow of this differential flowmeter of flowing through.
With respect to prior art, the family expenses of the present invention guard system that leaks utilizes this differential flowmeter that pipeline is fixed a point to survey in real time, and sets up corresponding alarm mechanism, realizes that household water leakage reports to the police.These family expenses guard system that leaks can detect not only whether drainage is arranged in the pipeline, and when the user ran into major accident, this system can also find the zone that leaks rapidly, and it is separated from piping system, casualty loss was dropped to minimum.The family expenses of the present invention guard system that leaks also utilizes digital indicator that user's total water amount is shown, thereby realizes digital and electronic water meter function, and further creates conditions for the user realizes telemeasurement, promptly realizes indoor dress table, outdoor reading.
The present invention is not limited to above-mentioned embodiment, if various changes of the present invention or distortion are not broken away from the spirit and scope of the present invention, if these changes and distortion belong within claim of the present invention and the equivalent technologies scope, then the present invention also is intended to comprise these changes and distortion.
Claims (10)
1. a differential flowmeter comprises a housing, it is characterized in that, described housing is provided with an inner chamber, and the intake tunnel and the exhalant canal that are communicated with inner chamber, and the axis of described intake tunnel is vertical mutually with the axis of exhalant canal; Also be provided with one in the described inner chamber and can move back and forth along the axis of intake tunnel to change the piston that is communicated with area of section between intake tunnel and the exhalant canal, an end of this piston is connected with a pressure unit by an elastic parts.
2. differential flowmeter as claimed in claim 1 is characterized in that: the fixedly connected area of section of described piston one end is greater than the seal of intake tunnel area of section.
3. differential flowmeter as claimed in claim 1 is characterized in that: the area of section of described inner chamber is greater than the area of section of intake tunnel.
4. differential flowmeter as claimed in claim 1 is characterized in that: described intake tunnel equates with the area of section of exhalant canal.
5. differential flowmeter as claimed in claim 1 is characterized in that: described elastic parts is made up of spring base and spring, and spring mounts elastically and is connected with piston, and spring base is connected with pressure unit.
6. differential flowmeter as claimed in claim 5 is characterized in that: described spring is a compression spring.
7. differential flowmeter as claimed in claim 1 is characterized in that: also comprise with housing cooperating installation end cover, described pressure unit is installed on the end cap.
8. family expenses guard system that leaks, it is characterized in that, comprise: differential flowmeter as claimed in claim 1, the microprocessor that has timer, electromagnetic valve, alarm and conduit pipeline, described differential flowmeter and electromagnetic valve are installed in series on conduit pipeline, microprocessor receives the signal that differential flowmeter transmits, and control alarm and electromagnetic valve.
9. the family expenses as claimed in claim 8 guard system that leaks is characterized in that: also comprise the display that is connected with microprocessor.
10. the family expenses as claimed in claim 8 guard system that leaks is characterized in that: also comprise the manually-operated gate that is installed in parallel on conduit pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110005296 CN102147271A (en) | 2011-01-12 | 2011-01-12 | Differential pressure flowmeter and domestic water-leakage protection system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110005296 CN102147271A (en) | 2011-01-12 | 2011-01-12 | Differential pressure flowmeter and domestic water-leakage protection system thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310594A (en) * | 2012-03-15 | 2013-09-18 | 刘锋利 | Water leakage failure alarming device for school toilet |
| CN103792408A (en) * | 2013-12-03 | 2014-05-14 | 镇江腾龙智能科技有限公司 | Streaming potential online measuring instrument bypass drainage channel improvement |
| CN105090032A (en) * | 2014-05-15 | 2015-11-25 | 艾默生环境优化技术(苏州)有限公司 | Liquid flow sensor and machine comprising same |
| CN105675068A (en) * | 2016-01-18 | 2016-06-15 | 福建省云创集成科技服务有限公司 | Universal-type flow meter based on wing principle |
| CN106768092A (en) * | 2016-11-22 | 2017-05-31 | 大连大开污水处理有限公司 | A kind of portable spring flowmeter |
| CN108167658A (en) * | 2018-01-04 | 2018-06-15 | 浙江大学 | The detecting system and detection method of pipe leakage within doors are surveyed with travel switch |
| CN109114434A (en) * | 2018-09-03 | 2019-01-01 | 蒋晓武 | A kind of gas pipeline leak detecting and alarming device with emergency cut-off |
| CN109630906A (en) * | 2019-02-19 | 2019-04-16 | 常州大学 | A kind of detachable pipeline leakage testing device and its detection method |
| CN111879370A (en) * | 2019-05-17 | 2020-11-03 | 淄博贝林电子有限公司 | Intelligent water meter with meter reading function |
| CN112577568A (en) * | 2020-11-02 | 2021-03-30 | 青蛙泵业股份有限公司 | Water source well water level monitoring system |
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| CN2416492Y (en) * | 2000-05-12 | 2001-01-24 | 济南高新开发区超星科技开发公司 | Piston type intelligent flow meter |
| CN1385588A (en) * | 2001-05-11 | 2002-12-18 | 庄革 | Intellignet drop and leakage resistant device |
| CN2574016Y (en) * | 2002-10-22 | 2003-09-17 | 李锏锋 | Water run-out preventing monitor |
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| CN2416492Y (en) * | 2000-05-12 | 2001-01-24 | 济南高新开发区超星科技开发公司 | Piston type intelligent flow meter |
| CN1385588A (en) * | 2001-05-11 | 2002-12-18 | 庄革 | Intellignet drop and leakage resistant device |
| CN2574016Y (en) * | 2002-10-22 | 2003-09-17 | 李锏锋 | Water run-out preventing monitor |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310594A (en) * | 2012-03-15 | 2013-09-18 | 刘锋利 | Water leakage failure alarming device for school toilet |
| CN103792408A (en) * | 2013-12-03 | 2014-05-14 | 镇江腾龙智能科技有限公司 | Streaming potential online measuring instrument bypass drainage channel improvement |
| CN105090032A (en) * | 2014-05-15 | 2015-11-25 | 艾默生环境优化技术(苏州)有限公司 | Liquid flow sensor and machine comprising same |
| CN105675068A (en) * | 2016-01-18 | 2016-06-15 | 福建省云创集成科技服务有限公司 | Universal-type flow meter based on wing principle |
| CN106768092A (en) * | 2016-11-22 | 2017-05-31 | 大连大开污水处理有限公司 | A kind of portable spring flowmeter |
| CN108167658A (en) * | 2018-01-04 | 2018-06-15 | 浙江大学 | The detecting system and detection method of pipe leakage within doors are surveyed with travel switch |
| CN109114434A (en) * | 2018-09-03 | 2019-01-01 | 蒋晓武 | A kind of gas pipeline leak detecting and alarming device with emergency cut-off |
| CN109630906A (en) * | 2019-02-19 | 2019-04-16 | 常州大学 | A kind of detachable pipeline leakage testing device and its detection method |
| CN111879370A (en) * | 2019-05-17 | 2020-11-03 | 淄博贝林电子有限公司 | Intelligent water meter with meter reading function |
| CN111879371A (en) * | 2019-05-17 | 2020-11-03 | 淄博贝林电子有限公司 | Intelligent water meter based on new communication mode meter reading |
| CN111879371B (en) * | 2019-05-17 | 2022-04-15 | 淄博贝林电子有限公司 | Intelligent water meter based on new communication mode meter reading |
| CN112577568A (en) * | 2020-11-02 | 2021-03-30 | 青蛙泵业股份有限公司 | Water source well water level monitoring system |
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Application publication date: 20110810 |