CN108414164A - The water leakage monitoring system and control method judged by difference in flow - Google Patents
The water leakage monitoring system and control method judged by difference in flow Download PDFInfo
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- CN108414164A CN108414164A CN201810228498.5A CN201810228498A CN108414164A CN 108414164 A CN108414164 A CN 108414164A CN 201810228498 A CN201810228498 A CN 201810228498A CN 108414164 A CN108414164 A CN 108414164A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25033—Pc structure of the system structure, control, syncronization, data, alarm, connect I-O line to interface
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25187—Transmission of signals, medium, ultrasonic, radio
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to a kind of water leakage monitoring systems judged by difference in flow, including controller, solenoid valve, first flow monitor and second flow monitor, it is provided with flow in induction water pipe on second flow monitor and data on flows is transferred to the inductor of controller by signal or electrical connection, first flow monitor is electrically connected with the controller, and then controlling solenoid valve by controller when first flow monitor and second flow monitor are there are difference in flow and reach maximum boundary's point value closes.It carries out judging there is efficient high accuracy by difference in flow.Whether the present invention is normal with water by the many-sided judgement of difference in flow synthesis for analyzing short time and prolonged flow monitoring instrument, and its precision is improved by accumulative judgement, when there is leak, system automatic decision and can close solenoid valve or leak information is sent to owner by network connecting module, avoid losing caused by leak timely and effectively to handle.
Description
Technical field
It is the present invention relates to monitoring alarm field, more particularly to a kind of household water leakage situation to be monitored and control method.
Background technology
In real life usually water pipe aging, leakage, rupture, tap are not shut or forget close etc. due to leak
Water not only causes water resource waste, water rate to increase in this way, but also entail dangers to building leads to house destruction and property loss, especially
Its leak at house compact district, one may cause damages to many units of neighbouring and lower layer, give the daily life band of resident
It is inconvenient to come.Such situation is commonplace in actual life, therefore is monitored to household water situation, in time will be in family
The water leakage situation of appearance notifies owner, is just particularly important timely and effectively to handle.Leak include narrow sense leak and
It is improper to use water.The leak of narrow sense refers to run, drip, leak；Improper with water referred to the relatively-stationary use of prolonged flow
Water, such as tap forget failure etc. when pass, for a long time uncomfortable water stream bathing, washing machine work.
The method for having several detection leaks at present, as used the acoustic wave vibrations signal of ultrasonic wave, flow or utilizing special inspection
The methods of conducting wire is surveyed to be detected.The above method is mainly used for finding leakage point after leak occurs, to search leakage cause,
There is no the function of pre- preventing water leakage, and the defects of that there is equipment is complicated, expensive, installation is inconvenient.It is existing in the market simultaneously
Water leakage alarm system be all leak water detdction suitable for industrial circle, and the water leakage alarm system towards average family does not almost have
Have.
Invention content
For presently, there are the problem of, the present invention proposes a kind of to be monitored alarm to household water leakage situation and processing is
System and control method realize prevention and control to household water leakage phenomenon, achieve the purpose that using water wisely, safe water.
A kind of water leakage monitoring system judged by difference in flow, including controller（100）, solenoid valve（300）And string
It is associated in water pipe（500）It is upper simultaneously to detect water pipe simultaneously（500）The first flow monitor of water flow（200）With second flow monitor
（600）, first flow monitor（200）It is placed in water pipe（500）Water inlet end, second flow monitor（600）It is placed in water pipe
（500）Water outlet, second flow monitor（600）On be provided with induction water pipe（500）Interior flow simultaneously passes through data on flows
Signal or electrical connection are transferred to controller（100）Inductor（400）, first flow monitor（200）With controller（100）
Electrical connection, when first flow monitor（200）With second flow monitor（600）When there are difference in flow and reaching maximum boundary's point value
Then pass through controller（100）Control solenoid valve（300）It closes.The first flow monitor（200）On be provided with measurement water
First impeller of amount（201）, the second flow monitor（600）On be provided with measure water the second impeller（601）, institute
The controller stated（100）Including time module, residual quantity judgment module and solenoid valve（300）Control module, the time module
Including short time presetting module and long-time presetting module, the controller（100）Respectively with solenoid valve（300）, it is first-class
Measure monitor（200）With second flow monitor（600）Electrical connection, when first flow monitor（200）It is monitored with second flow
Instrument（600）The water flow data detected within the time of short time presetting module setting is there are residual quantity and reaches short time residual quantity most
When big boundary's point value, controller（100）Residual quantity judgment module be determined as leak and close solenoid valve（300）, when pre- in the short time
If residual quantity or not up to predetermined value are not present in the time of module setting, then continue accumulative next short time presetting module setting
Time；When first flow monitor（200）With second flow monitor（600）Within the long-time presetting module preset time
The water flow data of detection passes through controller there are residual quantity and when reaching long-time residual quantity maximum circle point value（100）Residual quantity sentence
Disconnected module judgement leak simultaneously closes solenoid valve（300）, when first flow monitor（200）With second flow monitor（600）
When residual quantity or not up to predetermined value is not present in the water flow data detected in the long-time presetting module preset time, then continue to tire out
It counts next in the long-time presetting module preset time.
Preferably：The controller（100）Including being used to set first flow monitor in the short time（200）With second
Flow monitoring instrument（600）Short time residual quantity maximum circle point value short time difference in flow presetting module and for setting in long-time
First flow monitor（200）With second flow monitor（600）Long-time residual quantity maximum circle point value long-time difference in flow
Presetting module, when being judged within the predetermined time of short time predetermined module, when first flow monitor（200）With second
Measure monitor（600）Residual quantity carry out closing solenoid valve when reaching short time residual quantity maximum circle point value（300）, predetermined in long-time
When being judged in the predetermined time of module, when first flow monitor（200）With second flow monitor（600）Residual quantity reach
Closing solenoid valve is carried out when to long-time residual quantity maximum circle point value（300）.
Preferably：The first flow monitor（200）With second flow monitor（600）For monolithic construction or
Split structure, the first flow monitor（200）With second flow monitor（600）It can be monitoring ultrasonic instrument.
The controller（100）Further include network connecting module and alarm monitor；First flow monitor（200）, second flow
Monitor（600）And solenoid valve（300）It is connected to water inlet pipe（500）On the road, first flow monitor（200）Pulse output end
And second flow monitor（600）Pulse output end is and controller（100）Residual quantity judgment module connection, controller（100）
Solenoid valve（300）Control module and solenoid valve（300）Connection；Controller（100）Pass through network connecting module and family wifi
Signal or mobile 4G signals connection；Alarm monitor passes through signal wire and controller（100）Connection；It is provided in alarm monitor
Alarm buzzer, water leakage alarm indicator light and releasing alarm button, the solenoid valve（300）It is placed in first flow monitor
（200）With second flow monitor（600）Between.
Meanwhile the present invention provides a kind of monitoring method of the water leakage monitoring system judged by difference in flow, feature
It is：This method device in order to control（100）It receives and analyzes from first flow monitor（200）Flow number and second flow prison
Survey instrument（600）Flow number in short time predetermined module and carried out respectively to specific discharge in the long-time predetermined module scheduled time
Value, judges first flow monitor（200）With second flow monitor（600）Between difference in flow；If in the scheduled short time
Or in long-time difference in flow be more than corresponding short time residual quantity maximum circle point value or long-time residual quantity maximum circle point value when, when hold
The continuous time reaches time of fire alarming setting value, then starts alarm monitor, and sound-light alarm reminds owner；If in the time of setting
Interior unmanned releasing alarm is then transmitted a signal to by network connecting module in the cell phone application of owner, notifies owner, and can pass through
APP remote processings；If controller within the set time（100）It is not received by owner's processing information and then starts solenoid valve
（300）, turn off water inlet pipe（500）Road；If it is poor to be less than the corresponding short time for difference in flow within the scheduled short time or long-time
When the maximum boundary's point value of amount or long-time residual quantity maximum circle point value, then it is predetermined to be accumulated to next short time predetermined module for its quantity value
Time or long-time predetermined module scheduled time.
Whether the present invention is normal with water by analyzing the judgement of water use variation rate, in combination with first flow monitor（200）
With second flow monitor（600）Between difference in flow, can judge currently to use regimen condition in time, system meeting when leak occur
Automatically leak information is sent by network connecting module to owner, timely and effectively to handle.First flow in the present invention
Monitor（200）, second flow monitor（600）, solenoid valve（300）, network connecting module etc. can buy take in the market
, it is whether normal with water by the many-sided judgement of difference in flow synthesis for analyzing short time and prolonged flow monitoring instrument, and lead to
Accumulative judgement is crossed to improve its precision, system understands automatic decision and closes solenoid valve when there is leak（300）Or by leak
Information is sent to owner by network connecting module, avoids losing caused by leak timely and effectively to handle, and has
Have the advantages that at low cost, esy to use, safe and reliable.
Description of the drawings
Fig. 1 is the structural schematic diagram of monoblock type of the present invention；
Fig. 2 is the time shaft schematic diagram of time control of the present invention.
In figure：100- controllers, 200- first flow monitors, the first impellers of 201-, 300- solenoid valves, 400- inductions
Device, 500- water pipes, 600- second flow monitors, the second impellers of 601-.
Specific implementation mode
Such as Fig. 1-Fig. 2, a kind of shown water leakage monitoring system judged by difference in flow, it is characterised in that：Including control
Device 100, solenoid valve 300 and the first flow monitor 200 for being connected on water pipe 500 and detecting simultaneously 500 water flow of water pipe processed
With second flow monitor 600, first flow monitor 200 is placed in the water inlet end of water pipe 500, and second flow monitor 600 is set
Flow and data on flows is passed through in being provided on the water outlet of water pipe 500, second flow monitor 600 in induction water pipe 500
Signal or electrical connection are transferred to the inductor 400 of controller 100, and first flow monitor 200 is electrically connected with controller 100,
Then pass through control when first flow monitor 200 and second flow monitor 600 are there are difference in flow and reach maximum boundary's point value
Device 100 controls solenoid valve 300 and closes.The controller 100 includes that time module, residual quantity judgment module and solenoid valve 300 are controlled
Molding block, the time module include short time presetting module and long-time presetting module, the controller 100 respectively with
Solenoid valve 300, first flow monitor 200 and second flow monitor 600 are electrically connected, with reference to figure 2, when first flow monitor
200 and the water flow number that is detected in 3 seconds in time, that is, Fig. 2 that short time presetting module is set of second flow monitor 600
According to there are residual quantity and when reaching short time residual quantity maximum circle point value, the residual quantity judgment module of controller 100 is determined as leak and closes
Solenoid valve 300 is closed, when residual quantity or not up to predetermined value are not present within the time that short time presetting module is set, then continues to add up
The time of next short time presetting module setting；When first flow monitor 200 and second flow monitor 600 are for a long time
The water flow data detected in 1800 seconds in presetting module preset time and Fig. 2 is there are residual quantity and reaches long-time residual quantity most
When big boundary's point value, leak is judged by the residual quantity judgment module of controller 100 and closes solenoid valve 300, when first flow monitors
There is no poor for the water flow data that instrument 200 and second flow monitor 600 detect within the long-time presetting module preset time
When amount or not up to predetermined value, then continue accumulative next in the long-time presetting module preset time.The present invention's can pass through
It can also be monitored in real time by accumulation after data judge non-leak to ensure its prison after short time and prolonged judgement
The precision of control, meanwhile, it is monitored with the two-way simultaneous of short time realize the effective monitoring of micro- leakage and quick-fried leakage respectively for a long time.
Meanwhile the controller 100 includes for setting first flow monitor 200 and second flow prison in the short time
Survey the short time difference in flow presetting module of the short time residual quantity maximum circle point value of instrument 600 and for setting first flow in long-time
The long-time difference in flow presetting module of the long-time residual quantity maximum circle point value of monitor 200 and second flow monitor 600, short
When being judged in the predetermined time of time predetermined module, when the difference of first flow monitor 200 and second flow monitor 600
Amount carries out when reaching short time residual quantity maximum circle point value closing solenoid valve 300, within the predetermined time of long-time predetermined module into
When row judges, when the residual quantity of first flow monitor 200 and second flow monitor 600 reaches long-time residual quantity maximum circle point value
Shi Jinhang closes solenoid valve 300.
The first flow monitor 200 and second flow monitor 600 are monolithic construction or split structure,
In selecting, it is selected according to the case where water pipe 500, its structural compactness of monolithic construction is strong, easy for installation；Its is split type
Its Installation Flexibility is high when structure, and monitoring range is big and monitoring precision is high.The first flow monitor 200 and second
It can be monitoring ultrasonic instrument to measure monitor 600.Its monitoring ultrasonic instrument feeds back to measure water pipe by the signal of ultrasonic wave
Flow can also carry out traffic monitoring using above-mentioned impeller.The controller 100 further includes network connecting module and alarm
Monitor；First flow monitor 200, second flow monitor 600 and solenoid valve 300 are connected to water inlet pipe 500 on the road, and first
The pulse output end and 600 pulse output end of second flow monitor of flow monitoring instrument 200 judge with the residual quantity of controller 100
Module connects, and 300 control module of solenoid valve of controller 100 is connect with solenoid valve 300；Controller 100 passes through network connection mould
Block is connect with family's wifi signals or mobile 4G signals；Alarm monitor is connect by signal wire with controller 100；Alarm monitoring
It is provided with alarm buzzer, water leakage alarm indicator light in device and releases alarm button, the solenoid valve 300 is placed in first flow
Between monitor 200 and second flow monitor 600.
Meanwhile the present invention provides a kind of monitoring method of the water leakage monitoring system judged by difference in flow, this method
Device 100 receives and analyzes the flow number of flow number and second flow monitor 600 from first flow monitor 200 in order to control
In short time predetermined module and comparison flow value is carried out in the long-time predetermined module scheduled time respectively, judges that first flow is supervised
Survey the difference in flow between instrument 200 and second flow monitor 600；If within the scheduled short time or long-time difference in flow be more than pair
When the short time residual quantity maximum circle point value or long-time residual quantity maximum circle point value answered, when the duration reach time of fire alarming setting
Value, then start alarm monitor, and sound-light alarm reminds owner；Pass through net if unmanned releasing alarm within the set time
Network link block transmits a signal in the cell phone application of owner, notifies owner, and can pass through APP remote processings；If in setting
Time internal controller 100 is not received by owner's processing information and then starts solenoid valve 300,500 tunnel of shutdown water inlet pipe；If pre- at this
Difference in flow is less than corresponding short time residual quantity maximum circle point value or long-time residual quantity maximum circle point in the fixed short time or long-time
When value, then its quantity value is accumulated to next short time predetermined module predetermined time or long-time predetermined module scheduled time.
Each component part and its major function are as follows：
1, first flow monitor 200 and second flow monitor 600：For detecting 500 water flow of water inlet pipe, to controller
100 provide the relevant information of water consumption.
2, solenoid valve 300：It is turned on and off 500 tunnel of water inlet pipe.
3, controller 100：The part is made of SCM system, receives the pulse letter from first flow monitor 200
Number, to being analyzed, being judged with regimen condition, corresponding control signal is sent out to alarm and automatic dialer, and return to owner
The signal dialled is handled.
4, network connecting module：For identification with management network signal, and for sending and receiving network signal.
5, alarm monitor：When judge there are leak, it is improper with water when, send out corresponding alarm signal, start the link,
Remind owner's processing.
Claims (9)
1. a kind of water leakage monitoring system judged by difference in flow, it is characterised in that：Including controller（100）, solenoid valve
（300）Be connected on water pipe（500）It is upper simultaneously to detect water pipe simultaneously（500）The first flow monitor of water flow（200）With second
Flow monitoring instrument（600）, first flow monitor（200）It is placed in water pipe（500）Water inlet end, second flow monitor（600）
It is placed in water pipe（500）Water outlet, second flow monitor（600）On be provided with induction water pipe（500）Interior flow is simultaneously flow
Data are transferred to controller by signal or electrical connection（100）Inductor（400）, first flow monitor（200）With control
Device processed（100）Electrical connection, when first flow monitor（200）With second flow monitor（600）There are difference in flow and ought reach
Then pass through controller when maximum boundary's point value（100）Control solenoid valve（300）It closes.
2. a kind of water leakage monitoring system judged by difference in flow according to claim 1, which is characterized in that described
Controller（100）Including time module, residual quantity judgment module and solenoid valve（300）Control module, the time module packet
Presetting module containing short time and long-time presetting module, the controller（100）Respectively with solenoid valve（300）, first flow
Monitor（200）With second flow monitor（600）Electrical connection, when first flow monitor（200）With second flow monitor
（600）The water flow data detected within the time of short time presetting module setting is there are residual quantity and reaches short time residual quantity maximum
When boundary's point value, controller（100）Residual quantity judgment module be determined as leak and close solenoid valve（300）, when default in the short time
Residual quantity or not up to predetermined value are not present in the time of module setting, then continues accumulative next short time presetting module setting
Time；When first flow monitor（200）With second flow monitor（600）It is examined within the long-time presetting module preset time
The water flow data of survey passes through controller there are residual quantity and when reaching long-time residual quantity maximum circle point value（100）Residual quantity judge
Module judges leak and closes solenoid valve（300）, when first flow monitor（200）With second flow monitor（600）In length
When residual quantity or not up to predetermined value is not present in the water flow data detected in the time presetting module preset time, then continue to add up
It is next in the long-time presetting module preset time.
3. a kind of water leakage monitoring system judged by difference in flow according to claim 2, which is characterized in that described
First flow monitor（200）On be provided with measure water the first impeller（201）, the second flow monitor
（600）On be provided with measure water the second impeller（601）.
4. a kind of water leakage monitoring system judged by difference in flow according to claim 2, which is characterized in that described
Controller（100）Including being used to set first flow monitor in the short time（200）With second flow monitor（600）It is short
The short time difference in flow presetting module of time residual quantity maximum circle point value and for setting first flow monitor in long-time（200）
With second flow monitor（600）Long-time residual quantity maximum circle point value long-time difference in flow presetting module, it is pre- in the short time
When being judged in the predetermined time of cover half block, when first flow monitor（200）With second flow monitor（600）Residual quantity
Closing solenoid valve is carried out when reaching short time residual quantity maximum circle point value（300）, within the predetermined time of long-time predetermined module into
When row judges, when first flow monitor（200）With second flow monitor（600）Residual quantity reach long-time residual quantity maximum circle
Closing solenoid valve is carried out when point value（300）.
5. a kind of water leakage monitoring system judged by difference in flow according to claim 1 or 2 or 4, feature exist
In the first flow monitor（200）With second flow monitor（600）It can be monitoring ultrasonic instrument.
6. a kind of water leakage monitoring system judged by difference in flow according to claim 1, which is characterized in that described
First flow monitor（200）With second flow monitor（600）For monolithic construction or split structure.
7. a kind of water leakage monitoring system judged by difference in flow according to claim 4, which is characterized in that described
Controller（100）Further include network connecting module and alarm monitor；First flow monitor（200）, second flow monitoring
Instrument（600）And solenoid valve（300）It is connected to water inlet pipe（500）On the road, first flow monitor（200）Pulse output end and
Two flow monitoring instruments（600）Pulse output end is and controller（100）Residual quantity judgment module connection, controller（100）Electricity
Magnet valve（300）Control module and solenoid valve（300）Connection；Controller（100）Pass through network connecting module and family's wifi signals
Or mobile 4G signals connection；Alarm monitor passes through signal wire and controller（100）Connection；Alarm is provided in alarm monitor
Buzzer, water leakage alarm indicator light and releasing alarm button.
8. a kind of water leakage monitoring system judged by difference in flow according to claim 7, which is characterized in that described
Solenoid valve（300）It is placed in first flow monitor（200）With second flow monitor（600）Between.
9. a kind of monitoring method of the water leakage monitoring system judged as claimed in claim 8 by difference in flow, feature
It is：This method device in order to control（100）It receives and analyzes from first flow monitor（200）Flow number and second flow prison
Survey instrument（600）Flow number in short time predetermined module and carried out respectively to specific discharge in the long-time predetermined module scheduled time
Value, judges first flow monitor（200）With second flow monitor（600）Between difference in flow；If in the scheduled short time
Or in long-time difference in flow be more than corresponding short time residual quantity maximum circle point value or long-time residual quantity maximum circle point value when, when hold
The continuous time reaches time of fire alarming setting value, then starts alarm monitor, and sound-light alarm reminds owner；If in the time of setting
Interior unmanned releasing alarm is then transmitted a signal to by network connecting module in the cell phone application of owner, notifies owner, and can pass through
APP remote processings；If controller within the set time（100）It is not received by owner's processing information and then starts solenoid valve
（300）, turn off water inlet pipe（500）Road；If it is poor to be less than the corresponding short time for difference in flow within the scheduled short time or long-time
When the maximum boundary's point value of amount or long-time residual quantity maximum circle point value, then it is predetermined to be accumulated to next short time predetermined module for its quantity value
Time or long-time predetermined module scheduled time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810228498.5A CN108414164A (en) | 2018-03-20 | 2018-03-20 | The water leakage monitoring system and control method judged by difference in flow |
| CN201910207945.3A CN109708829A (en) | 2018-03-20 | 2019-03-19 | The HVAC leak supervision method and monitoring system judged by difference in flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810228498.5A CN108414164A (en) | 2018-03-20 | 2018-03-20 | The water leakage monitoring system and control method judged by difference in flow |
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| CN108414164A true CN108414164A (en) | 2018-08-17 |
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| CN201810228498.5A Pending CN108414164A (en) | 2018-03-20 | 2018-03-20 | The water leakage monitoring system and control method judged by difference in flow |
| CN201910207945.3A Pending CN109708829A (en) | 2018-03-20 | 2019-03-19 | The HVAC leak supervision method and monitoring system judged by difference in flow |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910207945.3A Pending CN109708829A (en) | 2018-03-20 | 2019-03-19 | The HVAC leak supervision method and monitoring system judged by difference in flow |
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