CN103699107A - Building water overflow automatic alarm control system - Google Patents
Building water overflow automatic alarm control system Download PDFInfo
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- CN103699107A CN103699107A CN201410003479.4A CN201410003479A CN103699107A CN 103699107 A CN103699107 A CN 103699107A CN 201410003479 A CN201410003479 A CN 201410003479A CN 103699107 A CN103699107 A CN 103699107A
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Abstract
The invention relates to a control system, in particular to a building water overflow automatic alarm control system, which aims to solve the problem that a scattered control manner adopted for preventing water overflow of buildings is not suitable for the existing buildings, and centralized control is needed. When tap water or water in a heater accidentally overflows, and overflow sensors are submerged, detection signals are provided for a building water overflow automatic alarm controller by the overflow sensors, the building water overflow automatic alarm controller carries out detection judgment on the signals of the overflow sensors, when the signals meet the action condition of the building overflow automatic alarm controller, a relay control circuit is controlled to act, an alarm circuit is enabled to send out an alarm signal, and an electromagnet valve or an electrically operated valve is driven to act to close an overflow water source. The building water overflow automatic alarm controller comprises one or more hysteresis voltage comparison circuits, and the hysteresis voltage comparison circuits take LM339 voltage comparator integrated circuits as core elements for forming comparison circuits with a hysteresis starting function and a hysteresis closing function. The building water overflow automatic alarm control system is used for monitoring water overflow in the buildings.
Description
Technical field
The present invention relates to a kind of building spilling water automatic alarm control system.
Background technology
Along with China's economy and scientific and technical development and progress, novel intelligent building are rised sheer from level ground as emerged rapidly in large numbersBamboo shoots after a spring rain, and people's office and living environment are greatly improved, and house fitting-up and office facility are also day by day superior.Owing to still lacking building spilling water automatic alarm control system feasibility embodiment in existing building electrical technology, the building tap water being caused by a variety of causes and heating spilling water floods Frequent Accidents are huge to the property loss that people work and life brings.And existing anti-building spilling water technology is generally scattered control mode, its technology is not suitable for the design and construction of building standardized project and installs.
Summary of the invention
The object of the invention is to adopt scattered control mode to be not suitable for needing centralized control problem in existing building in order to solve current anti-building spilling water, the invention provides a kind of building spilling water automatic alarm control system.
Building spilling water automatic alarm control system of the present invention, it comprises building spilling water automatic alarm controller, one or more spilling water sensor, control relay circuit, warning circuit and power circuit;
Described building spilling water automatic alarm controller comprises one or more hysteresis voltage comparator circuits,
The detection signal output terminal of each spilling water sensor is connected with the detection signal input end of a hysteresis voltage comparator circuit, the detection signal output terminal of hysteresis voltage comparator circuit is connected with the detection signal input end of control relay circuit, control relay circuit opens or closes by the solenoid valve in watering pipeline in Control building, and the control signal output terminal of control relay circuit is connected with the control signal input end of warning circuit;
Power circuit is simultaneously for building spilling water automatic alarm controller, spilling water sensor, control relay circuit and warning circuit provide working power;
Described hysteresis voltage comparator circuit comprises polar capacitor C1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, the first variable resistor VR1, the second adjustable resistance VR2, comparer IC and diode D4;
Power supply positive pole and one end of resistance R 3 and one end of resistance R 1 of spilling water sensor connects the positive pole of power circuit simultaneously,
The other end of resistance R 3 is connected with one end of the first variable resistor VR1,
The detection signal output terminal of the other end of the first variable resistor VR1 and spilling water sensor, the positive pole of polar capacitor C1, the adjustable end of the first variable resistor VR1, the reverse signal input end of one end of resistance R 4, comparer IC are connected simultaneously,
The other end of resistance R 4 is connected with one end of the second adjustable resistance VR2,
The other end of resistance R 1 is connected with one end of resistance R 2 with the forward signal input end of comparer IC;
The power supply ground end of spilling water sensor and the negative pole of polar capacitor C1, the adjustable end of the other end of the second adjustable resistance VR2, the second adjustable resistance VR2 are, the power supply negative terminal utmost point of the other end of resistance R 2 and comparer IC connects the power supply ground of power circuit simultaneously;
The anodic bonding of the signal output part of comparer IC and diode D4,
The negative electrode of diode D4 is connected with one end of resistance R 7.
Beneficial effect of the present invention is, when tap water or the unexpected spilling water of heating installation, and spilling water sensor is not had by water logging, spilling water sensor resistance numerical value is below infinity becomes hundreds of kilo-ohm, detection signal is provided to building spilling water automatic alarm controller, building spilling water automatic alarm controller detects judgement to spilling water sensor signal, when meeting building spilling water automatic alarm controller operation condition, the action of pilot relay control circuit, and make warning circuit send alerting signal, drive solenoid valve or motorized valve action to close spilling water water source simultaneously.Result of the present invention is simple, economical and practical.The huge property loss that the present invention can effectively reduce or avoid building spilling water to cause to people.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the building spilling water automatic alarm control system described in embodiment one.
Fig. 2 is the circuit connection diagram of the building spilling water automatic alarm control system described in embodiment one.
Fig. 3 is the principle schematic of the building spilling water automatic alarm control system described in embodiment four.
Fig. 4 is the principle schematic of the self-lock switch described in concrete mode five.
Fig. 5 is structural representation of the present invention.
Fig. 6 is the vertical view of Fig. 5.
Fig. 7 is the sectional view of bolt type water sensor of the present invention.Wherein, 11 is that sensor positive electrode contacts end face with water, and 17 is triple cable lead-in wire, and described triple cable extension line comprises the lead-in wire of sensor negative electrode 15, the lead-in wire of sensor positive electrode 13 and pilot lamp lead-in wire.
Fig. 8 is electrical principle schematic diagram of the present invention.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1 and Fig. 2, building spilling water automatic alarm control system described in present embodiment, it comprises building spilling water automatic alarm controller 1, one or more spilling water sensor 2, control relay circuit 3, warning circuit 4 and power circuit 5;
Described building spilling water automatic alarm controller 1 comprises one or more hysteresis voltage comparator circuits,
The detection signal output terminal of each spilling water sensor 2 is connected with the detection signal input end of a hysteresis voltage comparator circuit, the detection signal output terminal of hysteresis voltage comparator circuit is connected with the detection signal input end of control relay circuit 3, control relay circuit 3 opens or closes by the solenoid valve in watering pipeline in Control building, and the control signal output terminal of control relay circuit 3 is connected with the control signal input end of warning circuit 4;
Described hysteresis voltage comparator circuit comprises polar capacitor C1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, the first variable resistor VR1, the second adjustable resistance VR2, comparer IC and diode D4;
Power supply positive pole and one end of resistance R 3 and one end of resistance R 1 of spilling water sensor 2 connects the positive pole of power circuit 5 simultaneously,
The other end of resistance R 3 is connected with one end of the first variable resistor VR1,
The detection signal output terminal of the other end of the first variable resistor VR1 and spilling water sensor 2, the positive pole of polar capacitor C1, the adjustable end of the first variable resistor VR1, the reverse signal input end of one end of resistance R 4, comparer IC are connected simultaneously,
The other end of resistance R 4 is connected with one end of the second adjustable resistance VR2,
The other end of resistance R 1 is connected with one end of resistance R 2 with the forward signal input end of comparer IC;
The power supply ground end of spilling water sensor 2 and the negative pole of polar capacitor C1, the adjustable end of the other end of the second adjustable resistance VR2, the second adjustable resistance VR2 are, the power supply negative terminal utmost point of the other end of resistance R 2 and comparer IC connects the power supply ground of power circuit 5 simultaneously;
The anodic bonding of the signal output part of comparer IC and diode D4,
The negative electrode of diode D4 is connected with one end of resistance R 7.
Building spilling water automatic alarm controller 1 is arranged on tap water meter closer locations metope and controls single household, also can be arranged on corridor, corridor metope and control many families, adopts cartridge type to install during construction.Spilling water sensor 2 is arranged on kitchen and toilet, ground, toilet floor tile.During monitoring heating spilling water, spilling water sensor 2 is arranged on ground, every group of radiator below.Geothermal heating system spilling water sensor is arranged on underground heat ground with geothermal tube.
Solenoid valve or motorized valve are arranged on the pipeline after tap water meter.During prevention heating installation spilling water, solenoid valve or motorized valve are arranged on heating water water inlet tube pipe and return pipe.Opening or closing by control relay circuit 3 of solenoid valve or motorized valve controlled.
Present embodiment is independent minute family control system simultaneously, Ji Yihuwei unit's self-organizing system, and the benefit of present embodiment is:
(1) compare with selection centralized system scheme, this scheme is without personal management.
(2) compare with centralized control, independent minute family control system, construction cost is low, and controlling unit is few, and reliability is high.
(3) without the dispute of spilling water management responsibility.
(4) this invention system controller is cheap, is particularly suitable for minute He Duo family, family and controls use.
Embodiment two: present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment one, and described control relay circuit 3 comprises resistance R 7, diode D9, NPN type triode Q1 and relay;
One end of a switch of one end of the negative electrode of diode D9, the coil of relay and relay connects the positive pole of power circuit 5 simultaneously;
The negative electrode of diode D4 is connected with one end of resistance R 7, and the other end of resistance R 7 is connected with the base stage of NPN type triode Q1, and the collector of NPN type triode Q1 is connected with the other end of the anode of diode D9 and the coil of relay simultaneously.
The other end of a switch of relay connects needs opening or closing of the solenoid valve of control in building.
Embodiment three: present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment two, and described warning circuit 4 comprises diode D3, hummer K, resistance R 6 and light emitting diode D2;
One end of one end of resistance R 6 and hummer K connects the positive pole of power circuit 5 simultaneously,
The anodic bonding of the other end of resistance R 6 and light emitting diode D2, the other end of the negative electrode of light emitting diode D2 and hummer K and the anodic bonding of diode D3, the negative electrode of diode D3 is connected with the other end of the coil of relay.
Embodiment four: present embodiment is described in conjunction with Fig. 3, present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment one or two, it also comprises a plurality of control relay circuits 3, the detection signal output terminal of the hysteresis voltage comparator circuit of building spilling water automatic alarm controller 1 is connected with the detection signal input end of each control relay circuit 3 simultaneously, each control relay circuit 3 opens or closes by corresponding solenoid valve in watering pipeline in Control building, the control signal output terminal of each control relay circuit 3 is connected with the control signal input end of warning circuit 4 simultaneously.
Building spilling water automatic alarm control system when present embodiment is applicable to there is a plurality of water solenoid valve in a family, when indoor any spilling water sensor 2 detects spilling water signal, building spilling water automatic alarm controller 1 sends detection signal to each control relay circuit 3, and each control relay circuit 3 can be controlled corresponding closed electromagnetic valve.
For example indoor have tap water solenoid valve and the solenoid valve that heats, and when any spilling water sensor 2 detects spilling water signal, building spilling water automatic alarm controller 1 can be controlled tap water solenoid valves by corresponding control relay circuit 3 and close with heating solenoid valve simultaneously.
Embodiment five: present embodiment is described in conjunction with Fig. 4, present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment one, it also comprises self-lock switch 6, described self-lock switch 6 is connected between the detection signal output terminal and building spilling water automatic alarm controller 1 of spilling water sensor 2, and described self-lock switch 6 is the self-lock switch of metal tape lamp.
The self-lock switch of metal tape lamp is for there being the toilet design of shower.It is arranged on this toilet metope.Its effect is first self-lock switch to be pressed when needs shower, removes the duty of spilling water sensor, and there is water on ground when avoiding shower, and water source is closed in the misoperation of building spilling water automatic alarm controller.
Embodiment six: present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment one, the comparer IC of described hysteresis voltage comparator circuit adopts LM339 voltage comparator integrated circuit to realize.
Building spilling water automatic alarm control system described in present embodiment, for improving the reliability of automatic alarm controller, hysteresis voltage comparator circuit is only core parts with 1 LM339 voltage comparator integrated circuit, with the first variable resistor VR1, variable VR2, capacitor C 1 and the various kinds of sensors with resistive switch feature, formed a kind of sluggish unlatching and sluggish closing function that have, hysteresis voltage comparator circuit, in circuit, the second adjustable resistance VR2 is used for the sluggish opening time window of regulating circuit, in circuit, the first variable resistor VR1 is used for the sluggish shut-in time window of regulating circuit, the selection of capacitor C 1 amount of capacity can decision-making circuit lag time window width.This circuit has the anti-function of trembling, and it can prevent circuit erroneous action effectively, and its control action time can be adjusted within the specific limits.This circuit can be widely used in the control circuit of various resistive switch feature sensors, is a kind of broad-spectrum novel hysteresis control circuit that voltage comparator is core of take.
Embodiment seven: present embodiment is described in conjunction with Fig. 5, Fig. 6 and Fig. 7, present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment one, described spilling water sensor 2 comprises sensor positive electrode 13, sensor negative electrode 15, the first metallic conductor 7 and the second metallic conductor 10
The profile of described the first metallic conductor 7 is that bolt, center are with the housing of cavity, described the second metallic conductor 10 is arranged in the cavity of the first metallic conductor 7, the upper surface of the upper surface of this second metallic conductor 10 and the first metallic conductor 7 is positioned at same plane, between the first metallic conductor 7 and the second metallic conductor 10, be filled with Electronic Packaging glue 12 and realize insulation isolation
Described sensor negative electrode 15 with in the first metallic conductor 7 electrical connections, described sensor positive electrode 13 and the second metallic conductor 10 electrical connections, the lead-in wire of the lead-in wire of sensor negative electrode 15 and sensor positive electrode 13 is all drawn by the bottom of the first metallic conductor 7.
The first metallic conductor 7 in present embodiment adopts the structure of bolt types, makes that present embodiment is more convenient to be fixed on ground, and present embodiment is simple in structure, easy to use.
The negative electrode 15 of sensor and the lead-in wire of positive electrode 13 are for being connected the detection signal input end of the hysteresis voltage comparator circuit of building spilling water automatic alarm controller 1.
The bolt type water sensor that present embodiment proposes can conveniently be fixedly mounted on building kitchen, toilet or toilet floor ceramic tile by bolt arrangement.And the present invention adopts materials such as having corrosion-resistant, high strength to make.The upper surface of the first metallic conductor 7 of the present invention is surface of contact of sensor negative electrode and water, in shell body, stud with T shape stainless steel right cylinder (sensor positive electrode), the top end face of the second metallic conductor 10 is surface of contact of sensor positive pole and water, when the unexpected spilling water in building ground, sensor positive and negative electrode end face is not had by water logging, sensor resistance is below infinity becomes rapidly hundreds of kilo-ohm, and for building ground, whether spilling water provides detection identification signal.
Embodiment eight: present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment seven,
Described nut 8 is socketed in the outside surface of the first metallic conductor 7, realizes and being threaded with the screw thread of the first metallic conductor 7 sidewalls.
Embodiment nine: present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment seven or eight, and described Electronic Packaging glue 12 is transparent epoxy resin Electronic Packaging glue.
Embodiment ten: in conjunction with Fig. 8, present embodiment is described, present embodiment is the further restriction to the building spilling water automatic alarm control system described in embodiment nine, and described spilling water sensor 2 also comprises indicator light circuit,
Described indicator light circuit comprises pilot lamp 14 and current-limiting resistance 16;
The negative pole of described pilot lamp is connected with the negative electrode of sensor, and the positive pole of described pilot lamp is connected with one end of current-limiting resistance 16, and the other end of described current-limiting resistance 16 is gone between and drawn by the bottom of the first metallic conductor 7 by pilot lamp;
Described pilot lamp 14 and current-limiting resistance 16 are all positioned at the first metallic conductor 7, and are positioned at the below of the second metallic conductor 10.
The indicator light circuit of present embodiment is the relay indicating light of bolt type water sensor.
Fill with by high-strength transparence epoxy resin Electronic Packaging rubber seal the inside of present embodiment, and good seal performance, physical strength are high, easy for installation.And adopt described transparent epoxy resin electronic seal to contribute to the light of built-in pilot lamp to transmit, water sensor of the present invention is not afraid of personnel and is trampled with common mechanical and collide with, and is applicable to very much the environment such as public place and residential building and uses.
Claims (10)
1. building spilling water automatic alarm control system, is characterized in that, it comprises building spilling water automatic alarm controller (1), one or more spilling water sensor (2), control relay circuit (3), warning circuit (4) and power circuit (5);
Described building spilling water automatic alarm controller (1) comprises one or more hysteresis voltage comparator circuits,
The detection signal output terminal of each spilling water sensor (2) is connected with the detection signal input end of a hysteresis voltage comparator circuit, the detection signal output terminal of hysteresis voltage comparator circuit is connected with the detection signal input end of control relay circuit (3), control relay circuit (3) opens or closes by the solenoid valve in watering pipeline in Control building, and the control signal output terminal of control relay circuit (3) is connected with the control signal input end of warning circuit (4);
Power circuit (5) is simultaneously for building spilling water automatic alarm controller (1), spilling water sensor (2), control relay circuit (3) and warning circuit (4) provide working power;
Described hysteresis voltage comparator circuit comprises polar capacitor C1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, the first variable resistor (VR1), the second adjustable resistance (VR2), comparer (IC) and diode D4;
Power supply positive pole and one end of resistance R 3 and one end of resistance R 1 of spilling water sensor (2) connects the positive pole of power circuit (5) simultaneously,
The other end of resistance R 3 is connected with the one end of the first variable resistor (VR1),
The other end of the first variable resistor (VR1) with the detection signal output terminal of spilling water sensor (2), the reverse signal input end of the positive pole of polar capacitor C1, the adjustable end of the first variable resistor (VR1), one end of resistance R 4, comparer (IC) be connected simultaneously
The other end of resistance R 4 is connected with the one end of the second adjustable resistance (VR2),
The other end of resistance R 1 is connected with one end of resistance R 2 with the forward signal input end of comparer (IC);
Power supply ground end and the negative pole of polar capacitor C1, the power supply negative terminal utmost point of the other end of the second adjustable resistance (VR2), the adjustable end of the second adjustable resistance (VR2), the other end of resistance R 2 and comparer (IC) of spilling water sensor (2) connects the power supply ground of power circuit (5) simultaneously;
The signal output part of comparer (IC) and the anodic bonding of diode D4,
The negative electrode of diode D4 is connected with one end of resistance R 7.
2. building spilling water automatic alarm control system according to claim 1, is characterized in that,
Described control relay circuit (3) comprises resistance R 7, diode D9, NPN type triode (Q1) and relay;
One end of a switch of one end of the negative electrode of diode D9, the coil of relay and relay connects the positive pole of power circuit (5) simultaneously;
The negative electrode of diode D4 is connected with one end of resistance R 7, and the other end of resistance R 7 is connected with the base stage of NPN type triode (Q1), and the collector of NPN type triode (Q1) is connected with the other end of the anode of diode D9 and the coil of relay simultaneously.
3. building spilling water automatic alarm control system according to claim 2, is characterized in that,
Described warning circuit (4) comprises diode D3, hummer (K), resistance R 6 and light emitting diode D2;
One end of one end of resistance R 6 and hummer (K) connects the positive pole of power circuit (5) simultaneously,
The anodic bonding of the other end of resistance R 6 and light emitting diode D2, the other end of the negative electrode of light emitting diode D2 and hummer (K) and the anodic bonding of diode D3, the negative electrode of diode D3 is connected with the other end of the coil of relay.
4. building spilling water automatic alarm control system according to claim 1 and 2, it is characterized in that, it also comprises a plurality of control relay circuits (3), the detection signal output terminal of the hysteresis voltage comparator circuit of building spilling water automatic alarm controller (1) is connected with the detection signal input end of each control relay circuit (3) simultaneously, each control relay circuit (3) opens or closes by corresponding solenoid valve in watering pipeline in Control building, the control signal output terminal of each control relay circuit (3) is connected with the control signal input end of warning circuit (4) simultaneously.
5. building spilling water automatic alarm control system according to claim 1, it is characterized in that, it also comprises self-lock switch (6), described self-lock switch (6) is connected between the detection signal output terminal and building spilling water automatic alarm controller (1) of spilling water sensor (2), and described self-lock switch (6) is the self-lock switch of metal tape lamp.
6. building spilling water automatic alarm control system according to claim 1, is characterized in that, the comparer of described hysteresis voltage comparator circuit (IC) adopts LM339 voltage comparator integrated circuit to realize.
7. building spilling water automatic alarm control system according to claim 1, is characterized in that, described spilling water sensor (2) comprises sensor positive electrode (13), sensor negative electrode (15), the first metallic conductor (7) and the second metallic conductor (10),
The profile of described the first metallic conductor (7) is that bolt, center are with the housing of cavity, described the second metallic conductor (10) is arranged in the cavity of the first metallic conductor (7), the upper surface of the upper surface of this second metallic conductor (10) and the first metallic conductor (7) is positioned at same plane, between the first metallic conductor (7) and the second metallic conductor (10), be filled with Electronic Packaging glue (12) and realize insulation isolation
Described sensor negative electrode (15) with at the first metallic conductor (7), be electrically connected, described sensor positive electrode (13) and the second metallic conductor (10) electrical connection, the lead-in wire of the lead-in wire of sensor negative electrode (15) and sensor positive electrode (13) is all drawn by the bottom of the first metallic conductor (7).
8. building spilling water automatic alarm control system according to claim 7, it is characterized in that, it also comprises nut (8), and described nut (8) is socketed in the outside surface of the first metallic conductor (7), realizes and being threaded with the screw thread of the first metallic conductor (7) sidewall.
9. according to the building spilling water automatic alarm control system described in claim 7 or 8, it is characterized in that, described Electronic Packaging glue (12) is transparent epoxy resin Electronic Packaging glue.
10. building spilling water automatic alarm control system according to claim 9, is characterized in that, described spilling water sensor (2) also comprises indicator light circuit,
Described indicator light circuit comprises pilot lamp (14) and current-limiting resistance (16);
The negative pole of described pilot lamp is connected with the negative electrode of sensor, and the positive pole of described pilot lamp is connected with the one end of current-limiting resistance (16), and the other end of described current-limiting resistance (16) is gone between and drawn by the bottom of the first metallic conductor (7) by pilot lamp;
Described pilot lamp (14) and current-limiting resistance (16) are all positioned at the first metallic conductor (7), and are positioned at the below of the second metallic conductor (10).
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| CN201410003479.4A CN103699107B (en) | 2014-01-03 | 2014-01-03 | Building water overflow automatic alarm control system |
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| CN201410003479.4A CN103699107B (en) | 2014-01-03 | 2014-01-03 | Building water overflow automatic alarm control system |
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| CN105241591A (en) * | 2015-10-30 | 2016-01-13 | 湖北航天技术研究院总体设计所 | Adjustable retardation pressure alarm device |
| CN107038838A (en) * | 2017-04-15 | 2017-08-11 | 剑河县革东中学 | A kind of house waterproof automatic control alarm system |
| CN110907855A (en) * | 2019-11-08 | 2020-03-24 | 贵州电网有限责任公司 | Distribution network line fault detection method based on comprehensive distribution box and high-voltage sensor |
| CN113590412A (en) * | 2021-06-29 | 2021-11-02 | 无锡小天鹅电器有限公司 | Overflow detection method, system, device, electronic equipment and storage medium |
| CN115993162A (en) * | 2023-03-24 | 2023-04-21 | 嘉石科技股份有限公司 | Intelligent water meter capable of preventing disassembly and flooding alarm |
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| RO109388B1 (en) * | 1994-03-09 | 1995-01-30 | Constantin Bejan | Indication and alarm apparatus for the variation of the drilling fluid in the mud tanks |
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| CN110907855B (en) * | 2019-11-08 | 2021-05-04 | 贵州电网有限责任公司 | Distribution network line fault detection method based on comprehensive distribution box and high-voltage sensor |
| CN113590412A (en) * | 2021-06-29 | 2021-11-02 | 无锡小天鹅电器有限公司 | Overflow detection method, system, device, electronic equipment and storage medium |
| CN115993162A (en) * | 2023-03-24 | 2023-04-21 | 嘉石科技股份有限公司 | Intelligent water meter capable of preventing disassembly and flooding alarm |
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|---|---|
| CN103699107B (en) | 2016-02-17 |
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