CN205426286U - Electron water gauge and have its water level monitoring and early warning system - Google Patents
Electron water gauge and have its water level monitoring and early warning system Download PDFInfo
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- CN205426286U CN205426286U CN201520999844.1U CN201520999844U CN205426286U CN 205426286 U CN205426286 U CN 205426286U CN 201520999844 U CN201520999844 U CN 201520999844U CN 205426286 U CN205426286 U CN 205426286U
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Abstract
The utility model provides an electron water gauge and have its water level monitoring and early warning system, this electron water gauge include sensor module, energy collection board, treater, communication module and shell, and wherein the treater is microcontroller MCU, and sensor module, energy collection board, treater and communication module all are located the shell. This water level monitoring and early warning system include: a plurality of sub - electron water gauges, main electron water gauge, display module, server and a plurality of early warning terminal, wherein, the electron water gauge is installed respectively in the high position department of the monitoring of difference, main electron water gauge links to each other with every sub - electron water gauge, display module, server, and every early warning terminal links to each other with the server. The utility model has the characteristics of little, the low power dissipation of size.
Description
Technical field
This utility model relates to water level monitoring technical field, particularly to a kind of electric water gauge and water level monitoring and the early warning system with it.
Background technology
Existing to relate to main flow level sensor type and technological means in mountain torrents industry of a great variety, mainly can use touch sensor.Wherein, touch sensor include bubble type, pressure type, float type level meter, magnetostriction water-level gauge, etc..But the size sensor that existing water level monitoring uses is relatively big, does not meets electric water gauge national standard requirement, and silting easily occurs, causes water level monitoring precision to reduce and even cannot realize water level monitoring.Additionally, prior art lacks monitor set, collects, analyzes and report to the police in the systematization water level monitoring Macro or mass analysis equipment of one, it is impossible to realize water level monitoring early warning in time.
Utility model content
The purpose of this utility model is intended at least solve one of described technological deficiency.
To this end, the purpose of this utility model is propose a kind of electric water gauge and have its water level monitoring and early warning system, have the advantages that size is little, low in energy consumption.
To achieve these goals, this utility model embodiment on the one hand provides a kind of electric water gauge, including: for gathering the sensor assembly of current level signal, described sensor assembly includes multiple sensor unit, each described sensor unit include sensor contact and with contact fixed bit, described sensor contact is integrally formed with described contact fixed bit；For providing the energy resource collecting plate of electric energy；For according to described current level signal acquisition current level data and the processor of acquisition energy data, described processor is connected with the contact fixed bit of described sensor assembly and described energy resource collecting plate；For transmitting the communication module of described current level data, described communication module is connected with described processor；Shell, described sensor assembly, described energy resource collecting plate, described processor and described communication module are respectively positioned in described shell.
Further, described sensor assembly is touch sensor or noncontacting proximity sensor.
Further, described touch sensor is Reed pipe type sensor, float-ball type sensor or capacitance type sensor；Described noncontacting proximity sensor is laser range sensor.
Further, described energy resource collecting plate, described processor and described communication module are all integrated in described pcb board, and wherein, described sensor assembly is capacitance type sensor, and described capacitance type sensor uses the copper sheet on described pcb board or exposes contact fixed bit.
Further, described communication module uses wire communication mode and/or communication.
Further, described communication module is GPRS communication module or 433MHz communication module.
Further, described processor is microcontroller.
This utility model also proposes a kind of water level monitoring and early warning system, including: many sub-electric water gauges, the plurality of sub-electric water gauge is respectively arranged at different monitoring height and positions, and each described sub-electric water gauge is the electric water gauge described in above-described embodiment；Main electric water gauge, described main electric water gauge is connected with each described sub-electric water gauge to obtain the waterlevel data that each described sub-electric water gauge gathers, and described main electric water gauge is the electric water gauge described in above-described embodiment；For showing the display module of the waterlevel data of each sub-electric water gauge and main electric water gauge, described display module is connected with described main electric water gauge；For obtaining multiple described waterlevel data and being analyzed generating the server of early warning information, described server is connected with described main electric water gauge；Multiple Forewarning Terminals, each described Forewarning Terminal is connected to send described early warning information with described server.
Further, described display module is LED display.
Further, described Forewarning Terminal is personal computer PC or mobile terminal.
Electric water gauge according to this utility model embodiment and there is its water level monitoring and early warning system, use test using capacitance sensor water level, capacitance type sensor has preferable silting blocking effect, and the size of capacitance type sensor is less, being easy to be integrated in PCB, production cost is relatively low.Energy resource collecting plate integrated energy gathers Micro Energy Lose rwan management solution RWAN, it is provided that nA level super low-power consumption technology.This utility model can realize gathering sub-electric water gauges at different levels the gathering of water level and collect, unified transmission to main electric water gauge, main electric water gauge sending and be analyzed storage to server, carrying out alarm when there is exception to the Forewarning Terminal of user.This utility model is applicable to the level gauging (water, oil etc.) of the liquid of different medium, according to normal vibration computation of Period dielectric constant, automatically calibrates triggering factors.
Aspect and advantage that this utility model is additional will part be given in the following description, and part will become apparent from the description below, or is recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage will be apparent from easy to understand, wherein from combining the accompanying drawings below description to embodiment:
Fig. 1 is the structure chart of the electric water gauge according to this utility model embodiment；
Fig. 2 (a) to Fig. 2 (c) is the schematic diagram of touch sensor；
Fig. 3 is the schematic diagram of the noncontacting proximity sensor according to this utility model embodiment；
Fig. 4 is the circuit diagram of the energy resource collecting plate according to this utility model embodiment；
Fig. 5 is that the electric water gauge according to this utility model embodiment is prevented and treated along river levee, the scheme of installation of dam at mountain torrents；
Fig. 6 is the scheme of installation that the electric water gauge according to this utility model embodiment depends on body of wall bridge in urban waterlogging preventing and treating at the low-lying place of road；
Fig. 7 is that the structure relaxation oscillations structure of the built-in comparator of the processor according to this utility model embodiment is to realize the structure chart of touch key-press；
Fig. 8 is the processor I/O mouth capacitance type sensor mode of operation block diagram according to this utility model embodiment；
Fig. 9 is the sectional view of the electric water gauge according to this utility model embodiment；
Figure 10 is the front view of the electric water gauge according to this utility model embodiment；
Figure 11 (a) and Figure 11 (b) is left view and the right view of the electric water gauge according to this utility model embodiment；
Figure 12 is the axonometric chart of the electric water gauge according to this utility model embodiment；
Figure 13 is the schematic diagram of the copper sheet composition capacitance sensor of the PCB according to this utility model embodiment；
Figure 14 is the schematic diagram of the pcb board according to this utility model embodiment；
Figure 15 is the structure chart of the pcb board formula electric water gauge according to this utility model embodiment；
Figure 16 is the structure chart of the water level monitoring according to this utility model embodiment and early warning system；
Figure 17 is the main control flow chart of the electric water gauge according to this utility model embodiment；
Figure 18 is the data transmission flow figure according to this utility model embodiment.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, it is intended to be used for explaining this utility model, and it is not intended that to restriction of the present utility model.
As it is shown in figure 1, the electric water gauge of this utility model embodiment, including: sensor assembly 1, energy resource collecting plate 2, processor 3, communication module 4 and shell 5.
In an embodiment of the present utility model, sensor assembly 1 can be touch sensor or noncontacting proximity sensor.Wherein, touch sensor is Reed pipe type sensor, float-ball type sensor or capacitance type sensor, and noncontacting proximity sensor includes laser range sensor.
Fig. 2 (a) to Fig. 2 (c) respectively illustrates the schematic diagram of dry-reed, float-ball type and capacitance type sensor.
Reed pipe type sensor is mainly realized by dry-reed tube switch amount, uses passive mode to drive, can at utmost reduce power consumption.
Float-ball type sensor is made up of magnetic ball float, measurement conduit, signal element, electronic unit, rosette and installed part.Magnetic ball float can float on liquid level and move up and down along measuring conduit, and conduit is built with measuring cell, and tested liquid level signal can be converted into the resistance signal being proportional to liquid level change under magnetic action outside by it, and is converted into standard signal output.
Capacitance type sensor has preferable silting blocking effect, and the size of capacitance type sensor is less, it is simple to be integrated in PCB.
Fig. 3 is the schematic diagram of the noncontacting proximity sensor according to this utility model embodiment.A represents that sensor, B represent reflection drift.
Noncontacting proximity sensor is laser range sensor.Laser range sensor be generally used for measure object distance, due to liquid can produce refraction thus can not directly with measurement liquid level.Use laser range sensor to measure water level to need to increase reflection drift.Laser range sensor can be measured distance range 0.6-10m meet electric water gauge demand as RS232 or RS485 standard industry interface.
Energy resource collecting plate 2 is used for providing electric energy, uses energy acquisition power supply plan.Specifically, energy resource collecting plate 2 can be generated electricity by the vibrations in collection external environment condition, heat, luminous energy etc., it is adaptable to wireless senser is powered.
Preferably, energy resource collecting plate 2 generates electricity by gathering ambient lighting, and compared with tradition solar recharging, the program still can be charged under the low light level, dim environment, it is adaptable to haze, rainy weather or do not have the environment of direct sunlight.
Energy resource collecting plate 2 integrated energy gathers Micro Energy Lose rwan management solution RWAN, is especially suitable for the super low-power consumption application with specific demand.Specifically, the microwatt (μ W) generated in all kinds of DC source such as photovoltaic (solar energy) electromotor or thermoelectric generator etc. can be acquired to milliwatt (mW) level power and manage by this energy resource collecting plate 2, similar device takes the lead in achieve product and the efficient boost converter/charger of system (such as, wireless sensor network (WSN)) for having strict power supply and service requirement.That is, energy resource collecting plate 2 can be implemented as the DC-DC boost converter/charger only needing microwatt to start working.
Fig. 4 is the circuit diagram of the energy resource collecting plate according to this utility model embodiment.
After boost converter/charger starts, energy can be obtained from the low pressure output harvesters such as thermoelectric generator (TEG) or one piece/two pieces of solar panels efficiently.Boost converter can be started by the input voltage VIN of as little as 330mV.After startup, energy resource collecting plate 2 can rely on the input voltage VIN of as little as 80mV to continue collecting energy.
Energy resource collecting plate 2 furthermore achieved that a programmable MPPT maximum power point tracking sampling network, to optimize the transmission of the power to device.The sampling of VIN_DC open-circuit voltage is programmed by non-essential resistance, and is kept by external capacitive (CREF).
Such as, for the solaode that maximum power point is 80% open-circuit voltage, resitstance voltage divider can be set to the 80% of VIN_DC voltage, now VIN_DC can be controlled near the reference voltage of sampling by this network.In addition it is also possible to provide external reference voltages by processor, to produce an increasingly complex MPPT maximum power point tracking MPPT algorithm.
In order to help user strictly to control energy consumption budget further, when the voltage in energy-storage battery or electric capacity is down to below preset critical, energy resource collecting plate 2 can switch battery normal condition mark, and sends it to the processor 3 being attached thereto.This caution signals should trigger load current and decline, thus anti-locking system enters under-voltage condition.OV, UV and battery normality threshold are the most individually programmed.
Processor 3 is connected with contact fixed bit and the energy resource collecting plate 2 of sensor assembly 2, for receiving the current level signal of sensor assembly 1, and current level signal is converted to current level data, and receives the energy data from energy resource collecting plate 2.
In an embodiment of the present utility model, processor 3 can be microcontroller, such as model be the microcontroller of MSP430.
Processor 3 uses ferroelectric memory FRAM, and outside the advantage relevant with legacy memory technology, FRAM has system-level security advantages.Owing to eliminating electric charge pump, eliminate the crucial weakness being easily subject to physical attacks.FRAM can also resist the impact of electric field/magnetic field and radiation.Owing to FRAM state does not stores with form of electrical charges, alpha particle unlikely makes position change, and FRAM soft error rate (SER) is less than the limit that can detect that.Except this anti-external disturbance ability, the power loss that FRAM also has in anti-splitting ability, i.e. write/erase cycle does not results in corrupted data.Finally, FRAM can use encryption to protect data.The high writing speed of FRAM and high life enable developer more frequently to generate key, thus preferably protection data are transmitted.
Owing to capacitance touch scheme mostly is special IC, and relaxation oscillations touch key-press technology based on MSP430 uses the button detection technique of pure software.Can be for different application, different noise circumstances, integrated different filtering algorithm.Therefore, MPS430 touch key-press scheme has good interference free performance.
As it is shown in fig. 7, utilize the built-in comparator of processor 3 to build relaxation oscillations structure, it is achieved touch key-press.The built-in comparator of processor 3 and outside impulse electricity resistance Rc and inductance capacitance Csensor together form a relaxation oscillator structure.And inductance capacitance Csensor is exactly the element of coordinating of this agitator, any change of Csensor changes the resonant frequency of relaxation oscillator the most accordingly.The intervalometer A utilizing processor 3 built-in carrys out sample oscillations frequency, such that it is able to the change of Csensor detected.
In this utility model, processor 3 is by the change of the inductance capacitance of detection capacitance sensor, it is achieved the collection to current level signal, and current level signal is converted to current level data.
As shown in Figure 8, novel MSP430FR series monolithic I/O mouth is integrated with schmidt trigger function, directly can build relaxation oscillations structure by internal Schmidt trigger, it is not necessary to increase outside Rc.
Communication module 4 is connected with processor 3 and main electric water gauge, for transmitting current level data to main electric water gauge.
In an embodiment of the present utility model, communication module 4 uses wire communication mode and/or communication.Preferably, communication module 4 can be GPRS communication module or 433MHz communication module.
It should be noted that for multiple electric water gauges, use Sub_1GHz communication between water gauges at different levels and main scale, possess position between main scale and water gauge at different levels and know agreement.Main scale issues water level information by GPRS and GSM chain road direction public network.Fig. 5 is that the electric water gauge according to this utility model embodiment is prevented and treated along river levee, the scheme of installation of dam at mountain torrents.Fig. 6 is the scheme of installation that the electric water gauge according to this utility model embodiment depends on body of wall bridge in urban waterlogging preventing and treating at the low-lying place of road.
As it is shown in figure 9, sensor assembly 1 includes that multiple sensor unit, each sensor unit include sensor contact 11 and contact fixed bit 12.Sensor contact 11 is integrally formed with contact fixed bit 12.Sensor assembly 1 is used for gathering current level signal.
Sensor assembly 1, energy resource collecting plate 2, processor 3 and communication module 4 are respectively positioned in shell 5.Wherein, a side opening of shell 5, sensor contact is stretched out from opening part.The opposite side of shell 5 is coated with water gauge mark E.Preferably, shell 5 uses ABS plastic shell.
As shown in Figure 10, electric water gauge uses multistage erection method, single-unit water gauge a length of 500mm width 60mm thickness 20mm.The external form of sensor is 3mm screw.Electric water gauge side spraying the most alternate blue water gauge mark " E ".Figure 11 (a) and Figure 11 (b) is left view and the right view of the electric water gauge according to this utility model embodiment.Figure 12 is the axonometric chart of the electric water gauge according to this utility model embodiment.
In an embodiment of the present utility model, energy resource collecting plate 2, processor 3 and communication module 4 are all integrated in pcb board.Wherein, the size of pcb board can be 195mm × 50mm.
Now, sensor assembly 1 uses capacitance type sensor, and this capacitance type sensor can use the copper sheet on pcb board or expose contact fixed bit.Figure 13 is the schematic diagram of the copper sheet composition capacitance sensor of the PCB according to this utility model embodiment.
Use copper sheet on pcb board as electrode, due between copper sheet and the earth with air as medium, now the parasitic capacitance between copper sheet and the earth is a constant.When water level covers pcb board, and medium becomes liquid, also there is respective change in this parasitic capacitance.Judge the contact area of liquid and water gauge according to variable quantity and change size, thus judge liquid level, it is achieved the collection of height of water level.
I.e., now without using external devices, directly use the copper sheet of double-sided PCB board as capacitance sensor, gather water level signal.Figure 14 is the schematic diagram of the pcb board according to this utility model embodiment.PCB sensor specification: copper sheet size: 12mm × 15mm, sheet material: FR-4, copper is thick: 1Oz, thickness of slab: 2mm.The quantity of copper sheet can be 50.
Figure 15 is the structure chart of the pcb board formula electric water gauge according to this utility model embodiment.
Specifically, variable quantity and the change size of the parasitic capacitance between copper sheet and the liquid of pcb board are sent to processor 3 (MCU), processor 3 judges the contact area of liquid and water gauge, thus judge liquid level, it is achieved the collection of height of water level.Then, waterlevel data is sent to communication module 4 by processor 3, communication module 4 be sent out.
As shown in figure 16, this utility model embodiment also proposes a kind of water level monitoring and early warning system, including: sub-electric water gauge 10, main electric water gauge 20, display module 30, server 40 and the multiple Forewarning Terminal 50 that multiple above-described embodiments provide.
Specifically, many sub-electric water gauges 10 are respectively arranged at different monitoring height and positions, and main electric water gauge 20 is connected with each electric water gauge 10, obtain the waterlevel data that each electric water gauge 10 gathers.
In an embodiment of the present utility model, sub-electric water gauge 10 and main electric water gauge 20 can be all the electric water gauge that above-described embodiment provides.
Display module 30 is connected with main electric water gauge 20, for receiving the waterlevel data of autonomous electric water gauge 20, and displays to the user that each sub-electric water gauge 10 and the waterlevel data of main electric water gauge 20.Wherein, display module 30 can be LED display.
Server 40 is connected with main electric water gauge 20, is used for obtaining multiple waterlevel data and being analyzed, and when judging to occur abnormal, generates early warning information.
Each Forewarning Terminal 50 is connected with server 40, to send early warning information.In an embodiment of the present utility model, Forewarning Terminal 50 can be personal computer PC or mobile terminal.Wherein, personal computer PC is provided with early warning software, is installed on early warning APP on mobile terminals.User can pass through Forewarning Terminal 50 real time inspection waterlevel data and early warning information, takes preventive measures in time.
Figure 17 is the main control flow chart of the electric water gauge according to this utility model embodiment.
Step S1701, gathers sensor reference value.
Step S1702, standby.
Step S1703, it is judged that whether timing reaches 1 minute, if it is, perform step S1704, otherwise returns step S1702.
Wherein, timing can be arranged the most voluntarily by user.
Step S1704, gathers water level value.
Gathered current level signal by sensor assembly 1, and be sent to processor 3.By processor 3 according to waterlevel data corresponding to current level signal acquisition, i.e. water level value.
Step S1705, it is judged that whether the water level value of collection changes, without then returning step S1702, otherwise performs step S1706.
Processor 3 judges whether water level value changed compared with last time, and without then representing that the water level at this height and position is unchanged, if change, notice communication module 4 is sent to the water level value after change.
Step S1706, sends current level value.
Figure 18 is the data transmission flow figure according to this utility model embodiment.
Step S1801, it may be judged whether there are data to be sent, if it is perform step S1802；
Step S1802, intercepts.
Step S1803, it is judged that channel usage, if channel idle, performs step S1804.
Step S1804, sends data.
The communication module 4 of sub-electric water gauges 10 at different levels is to the communication module generation waterlevel data of main electric water gauge 20.
Electric water gauge according to this utility model embodiment and there is its water level monitoring and early warning system, use test using capacitance sensor water level, capacitance type sensor has preferable silting blocking effect, and the size of capacitance type sensor is less, being easy to be integrated in PCB, production cost is relatively low.Energy resource collecting plate integrated energy gathers Micro Energy Lose rwan management solution RWAN, it is provided that nA level super low-power consumption technology.This utility model can realize gathering sub-electric water gauges at different levels the gathering of water level and collect, unified transmission to main electric water gauge, main electric water gauge sending and be analyzed storage to server, carrying out alarm when there is exception to the Forewarning Terminal of user.This utility model is applicable to the level gauging (water, oil etc.) of the liquid of different medium, according to normal vibration computation of Period dielectric constant, automatically calibrates triggering factors.
In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means that the specific features, structure, material or the feature that combine this embodiment or example description are contained at least one embodiment of the present utility model or example.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in any one or more embodiments or example in an appropriate manner.
Although above it has been shown and described that embodiment of the present utility model, it is understandable that, above-described embodiment is exemplary, it is not intended that to restriction of the present utility model, above-described embodiment can be changed in the range of this utility model in the case of without departing from principle of the present utility model and objective, revises, replace and modification by those of ordinary skill in the art.Scope of the present utility model is extremely equal to by claims and limits.
Claims (10)
1. an electric water gauge, it is characterised in that including:
For gathering the sensor assembly of current level signal, described sensor assembly include multiple sensor unit, each described sensor unit include sensor contact and with contact fixed bit, described sensor contact is integrally formed with described contact fixed bit；
For providing the energy resource collecting plate of electric energy；
For according to described current level signal acquisition current level data and the processor of acquisition energy data, described processor is connected with the contact fixed bit of described sensor assembly and described energy resource collecting plate；
For transmitting the communication module of described current level data, described communication module is connected with described processor；
Shell, described sensor assembly, described energy resource collecting plate, described processor and described communication module are respectively positioned in described shell.
2. electric water gauge as claimed in claim 1, it is characterised in that described sensor assembly is touch sensor or noncontacting proximity sensor.
3. electric water gauge as claimed in claim 2, it is characterised in that described touch sensor is Reed pipe type sensor, float-ball type sensor or capacitance type sensor；Described noncontacting proximity sensor is laser range sensor.
4. electric water gauge as claimed in claim 1, it is characterized in that, described energy resource collecting plate, described processor and described communication module are all integrated in described pcb board, wherein, described sensor assembly is capacitance type sensor, and described capacitance type sensor uses the copper sheet on described pcb board or exposes contact fixed bit.
5. electric water gauge as claimed in claim 1, it is characterised in that described communication module uses wire communication mode and/or communication.
6. the electric water gauge as described in claim 1,4 or 5, it is characterised in that described communication module is GPRS communication module or 433MHz communication module.
7. electric water gauge as claimed in claim 1, it is characterised in that described processor is microcontroller.
8. a water level monitoring and early warning system, it is characterised in that including:
Many sub-electric water gauges, the plurality of sub-electric water gauge is respectively arranged at different monitoring height and positions, and each described sub-electric water gauge is the electric water gauge described in any one of claim 1-7；
Main electric water gauge, described main electric water gauge is connected with each described sub-electric water gauge to obtain the waterlevel data that each described sub-electric water gauge gathers, and described main electric water gauge is the electric water gauge described in any one of claim 1-7；
For showing the display module of the waterlevel data of each sub-electric water gauge and main electric water gauge, described display module is connected with described main electric water gauge；
For obtaining multiple described waterlevel data and being analyzed generating the server of early warning information, described server is connected with described main electric water gauge；
Multiple Forewarning Terminals, each described Forewarning Terminal is connected to send described early warning information with described server.
9. water level monitoring as claimed in claim 8 and early warning system, it is characterised in that described display module is LED display.
10. water level monitoring as claimed in claim 8 and early warning system, it is characterised in that described Forewarning Terminal is personal computer PC or mobile terminal.
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| CN201520999844.1U CN205426286U (en) | 2015-12-04 | 2015-12-04 | Electron water gauge and have its water level monitoring and early warning system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990957A (en) * | 2017-11-22 | 2018-05-04 | 广州奥格智能科技有限公司 | A kind of electric water gauge low-power consumption process circuit and its energy-saving detection method |
| CN111289037A (en) * | 2020-03-04 | 2020-06-16 | 南京管科智能科技有限公司 | Internet of things system based on electronic water gauge |
| WO2022252361A1 (en) * | 2021-06-04 | 2022-12-08 | 杨筑婷 | Intelligent automatic drainage device for pressure tank of air compressor |
-
2015
- 2015-12-04 CN CN201520999844.1U patent/CN205426286U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990957A (en) * | 2017-11-22 | 2018-05-04 | 广州奥格智能科技有限公司 | A kind of electric water gauge low-power consumption process circuit and its energy-saving detection method |
| CN111289037A (en) * | 2020-03-04 | 2020-06-16 | 南京管科智能科技有限公司 | Internet of things system based on electronic water gauge |
| WO2022252361A1 (en) * | 2021-06-04 | 2022-12-08 | 杨筑婷 | Intelligent automatic drainage device for pressure tank of air compressor |
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