CN205879847U - Novel high temperature resistant water leakage sensor - Google Patents
Novel high temperature resistant water leakage sensor Download PDFInfo
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- CN205879847U CN205879847U CN201620823575.8U CN201620823575U CN205879847U CN 205879847 U CN205879847 U CN 205879847U CN 201620823575 U CN201620823575 U CN 201620823575U CN 205879847 U CN205879847 U CN 205879847U
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Abstract
The utility creatively provides a novel high temperature resistant water leakage sensor, include: wave filter digital signal control circuit, sensor signal is received to the signal input part mouth of wave filter digital signal control circuit, the signal output part mouth electricity of wave filter digital signal control circuit is connected with two second order active filter's signal input part mouth, two second order active filter's signal output part mouth electricity is connected with electric capacity frequency converting circuit's signal input part mouth, a controller, the controller includes frequency calculation module and singlechip, frequency calculation module is connected with the monolithic is electromechanical, frequency calculation module is connected with electric capacity frequency converting circuit's signal output part mouth electricity. The utility model discloses create water leakage sensor, can effectively reduce the influence of waiting to detect the weeping temperature and detecting the sensitivity when higher to the weeping, reduced the probability of failing to report, reporting by mistake.
Description
Technical field
The invention belongs to electronic technology field, especially relates to a kind of novel fire resistant leakage sensor.
Background technology
Leakage sensor is contact Water immersion detector and non-contact type water soaked detector, contact Water immersion detector, profit
Detecting by liquid conduction principle, time normal, pop one's head in by air insulation in the two poles of the earth, and probe conducting under Riddled Condition, by spy
The detection of head two end electrodes electric conductivity (capacitance), it is judged that whether probe is by submergence of leaking, and then judges whether feelings of leaking occur
Condition.
Leakage sensor actually used during, leakage may have high-temperature relatively, as community heat exchange station leak
In liquid detection reality application, pipe network water leakage temperature is up to 79 degrees Celsius.Temperature such as leakage to be detected is higher, or leakage may
The temperature difference existed relatively big (0 °-90 ° degrees Celsius) will produce considerable influence to the precision of leak water detdction, it is possible to create fails to report, by mistake
The situations such as report, and the similar product of existing market is in view of limiting factors such as costs, is not optimized this problem.
Summary of the invention
In view of this, the invention is directed to a kind of novel fire resistant leakage sensor, it is possible to effectively reduce to be checked
Impact on leakage detection sensitivity when the liquid temp that leaks hunting is higher, reduces the probability failed to report, report by mistake.
For reaching above-mentioned purpose, the technical scheme of the invention is achieved in that
A kind of novel fire resistant leakage sensor, including:
Wave filter Digital Signals circuit, the signal input port of described wave filter Digital Signals circuit receives and passes
Sense signal, the signal output port of described wave filter Digital Signals circuit is electrically connected with the signal of double Second-Order Active Filters
Input port, the signal output port of described pair of Second-Order Active Filters is electrically connected with the signal input of capacitive frequency change-over circuit
Port；
Controller, described controller includes frequency computing module and single-chip microcomputer, and described frequency computing module is dynamo-electric with monolithic
Connecting, described frequency computing module electrically connects with the signal output port of capacitive frequency change-over circuit；
First power module, described first power module respectively with controller, capacitive frequency change-over circuit, double second order active
Wave filter and wave filter Digital Signals circuit electrical connection, and the first power module be controller, capacitive frequency change-over circuit,
Double Second-Order Active Filters and wave filter Digital Signals circuit provide power supply.
Further, described controller also includes that alarm control module, described alarm control module are electrically connected with buzzer.
Further, described controller also includes UART module, and described UART module connects MAX232 chip.
Further, described capacitive frequency change-over circuit is electrically connected with plane capacitance.
Further, described wave filter Digital Signals circuit include amplifier, adder, first integrator, second
Integrator, resistance R1-R4 and switch S1-S3, described amplifier, adder and first, second integrator are sequentially connected in series；
Described amplifier forms close loop negative feedback circuit with resistance R1 and resistance R2, and resistance R1 one end is anti-phase with amplifier
Input connects, and the other end of resistance R1 connects signal input port, the inverting input of described amplifier and first integrator
Outfan connected by resistance R3, on the circuit that the inverting input of described amplifier is connected with the outfan of second integral device
Being sequentially connected in series resistance R4 and switch S3, the outfan of described first integrator connects signal output port；
Described adder is connected with the end of incoming cables switching S1 and S2 the most respectively, and switch S1 and S2 is two-way choice switch, opens
The leading-out terminal closing S1 is connected with signal input port, and another leading-out terminal of switch S1 connects ground wire, of switch S2
Leading-out terminal is connected with the outfan of second integral device, and another leading-out terminal of switch S2 connects ground wire.
Further, described pair of Second-Order Active Filters is MAX260 chip, the CLKA of described pair of Second-Order Active Filters
With connection has crystal oscillator between OSC pin, short circuit between itself CLKOUT and CLKB pin, short circuit between BPA and INB pin, INA is
Signal input part, BPB is signal output part.
Relative to prior art, a kind of novel fire resistant leakage sensor described in the invention has the advantage that
Leakage sensor of the present invention is measured through reality, by introducing double Second-Order Active Filters, coordinates simultaneously
The Digital Signals circuit of gate buffering input filter, to compensate or to eliminate temperature contrast to detection electrode two ends electricity
The impact that capacitance is measured, and in a program capacitance change is done normalization statistics so that this sensor is at room temperature, high temperature, low
The judgement capacitance change that leaks under the different application scenes such as temperature is consistent, can effectively reduce high-temperature in the dead of night accurate to sensor alarm
The really impact of rate, improves precision and the accuracy of water leakage alarm, additionally, the plane capacitance that capacitive frequency change-over circuit connects also rises
Arrive filter action.
Accompanying drawing explanation
The accompanying drawing of the part constituting the invention is used for providing being further appreciated by the invention, and the present invention creates
The schematic description and description made, for explaining the invention, is not intended that the improper restriction to the invention.?
In accompanying drawing:
Fig. 1 is the leakage sensor electronic schematic diagram described in the invention embodiment；
Fig. 2 is the wave filter Digital Signals circuit theory diagrams described in the invention embodiment；
Fig. 3 is the double Second-Order Active Filters circuit theory diagrams described in the invention embodiment；
Fig. 4 is the capacitance-frequency translation circuit schematic diagram described in the invention embodiment；
Fig. 5 is that the controller in house software described in the invention embodiment performs flow chart.
Description of reference numerals:
1-controller；101-alarm control module；102-frequency computing module；103-second source module；104-UART
Module；105-single-chip microcomputer；2-buzzer；3-MAX232 chip；4-the first power module；The double Second-Order Active Filters of 5-；6-filters
Ripple device Digital Signals circuit；7-capacitive frequency change-over circuit；8-plane capacitance.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the invention and the feature in embodiment can
To be mutually combined.
In the description of the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " on ", D score,
Orientation or the position relationship of the instruction such as "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of description the invention and simplifies description rather than instruction
Hint indication device or element must have specific orientation, with specific azimuth configuration and operation, be not understood that
For the restriction to the invention.Additionally, term " first ", " second " etc. are only used for describing purpose, and it is not intended that indicate
Or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, " first ", " second " etc. are defined
Feature can express or implicitly include one or more this feature.In the description of the invention, unless separately
Being described, " multiple " are meant that two or more.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", should be interpreted broadly " being connected ", " connection ", for example, it may be fix connection, it is also possible to be to removably connect, or integratedly
Connect；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, on can being understood by concrete condition
State term concrete meaning in the invention.
Describe the invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
As it is shown in figure 1, a kind of novel fire resistant leakage sensor, including:
Wave filter Digital Signals circuit 6, the signal input port of described wave filter Digital Signals circuit 6 receives
Transducing signal, the signal output port of described wave filter Digital Signals circuit 6 is electrically connected with double Second-Order Active Filters 5
Signal input port, the signal output port of described pair of Second-Order Active Filters 5 is electrically connected with the letter of capacitive frequency change-over circuit 7
Number input port；
Controller 1, described controller 1 includes frequency computing module 102 and single-chip microcomputer 105, described frequency computing module 102
Electrically connecting with single-chip microcomputer 105, described frequency computing module 102 electrically connects with the signal output port of capacitive frequency change-over circuit 7；
First power module 4, described first power module 4 respectively with controller 1, capacitive frequency change-over circuit 7, double second order
Active filter 5 and wave filter Digital Signals circuit 6 electrically connect, and the first power module 4 is controller 1, capacitance x frequency
Change-over circuit 7, double Second-Order Active Filters 5 and wave filter Digital Signals circuit 6 provide power supply.
Described controller 1 also includes that alarm control module 101, described alarm control module 101 are electrically connected with buzzer 2.
Described controller 1 also includes UART module 104, and described UART module 104 connects MAX232 chip 3.
Described capacitive frequency change-over circuit 7 is electrically connected with plane capacitance 8.
As in figure 2 it is shown, described wave filter Digital Signals circuit 6 include amplifier, adder, first integrator,
Two integrators, resistance R1-R4 and switch S1-S3, described amplifier, adder and first, second integrator are sequentially connected in series；
Described amplifier forms close loop negative feedback circuit with resistance R1 and resistance R2, and resistance R1 one end is anti-phase with amplifier
Input connects, and the other end of resistance R1 connects signal input port, the inverting input of described amplifier and first integrator
Outfan connected by resistance R3, on the circuit that the inverting input of described amplifier is connected with the outfan of second integral device
Being sequentially connected in series resistance R4 and switch S3, the outfan of described first integrator connects signal output port；
Described adder is connected with the end of incoming cables switching S1 and S2 the most respectively, and switch S1 and S2 is two-way choice switch, opens
The leading-out terminal closing S1 is connected with signal input port, and another leading-out terminal of switch S1 connects ground wire, of switch S2
Leading-out terminal is connected with the outfan of second integral device, and another leading-out terminal of switch S2 connects ground wire.
As it is shown on figure 3, described pair of Second-Order Active Filters 5 is MAX260 chip, described pair of Second-Order Active Filters
Connect between CLKA and OSC pin and have crystal oscillator, short circuit between itself CLKOUT and CLKB pin, short circuit between BPA and INB pin,
INA is signal input part, and BPB is signal output part.
The work process of the present embodiment: if the signal of sensor probe collection is directly entered wave filter, its signal logic
Input transition can produce some noises at the outfan of wave filter, and if these noises can not be effectively eliminated, then may be used
Can be amplified by the amplifying circuit of rear end, in turn result in wrong report of leaking, therefore signal first passes through wave filter number before entering wave filter
Word signal control circuit 6, falls to enter in double Second-Order Active Filters 5, double second order active that this circuit uses by noise filtering
Wave filter 5 is MAX260 chip.
Two set wave filter in MAX260 sheet can tune, respectively to realize the filter polynomial of various complexity, this filtering
Circuit utilizes two second-order filter devices to be cascaded into fourth-order band-pass wave filter, and two devices can share a clock, by four
Rank band filter, can effectively filter the signal noise caused because of applied environment difference, coordinates amplifying circuit then may be used
To realize the effective compensation to different capacitance-frequency curves, after signal device after filtering, enter into capacitive frequency change-over circuit, electricity
Holding freq converting circuit as shown in Figure 4, export to P89C51 single-chip microcomputer after capacitance is converted into frequency values, single-chip microcomputer 105 leads to
Cross internal enumerator T1 and carry out the frequency counting to input, by obtaining capacitance after frequency-electric capacity Inversion Calculation, use sensing
Capacitance when device detection faces is dried is as initial capacitance Cx0, after leaking in the detection faces of sensor, causes the electricity that it exports
Appearance is changed to Cx, capacitance change Δ Cx and is:
Δ Cx=Cx-Cx0
A threshold frequency Δ Cref is set, as Δ Cx > Δ Cref, it is believed that foot detected in detection faces by test
Enough water yields, then Single-chip Controlling warning circuit realizes reporting to the police, otherwise it is assumed that be not detected by the water yield on pole plate.
This sensor step of leaking of detection judges step as it is shown in figure 5, update Single Chip Microcomputer (SCM) program water-leaking property:
(1) single-chip microcomputer hardware initialization, mainly T1 intervalometer, the initialization of UART, INT0；
(2) to frequency counting by the way of T1 enumerator utilizes outer pulse-triggered (INT0) within a certain period of time；
(3) according to present frequency count value, it is finally inversed by current capacitance, and and initial capacitance by linear fit coefficient
The difference of value calculates capacitance change between two-plate；
(4) being compared by capacitance change and threshold value capacitance, software provides judgement of whether leaking, if it is determined that calculate
Go out to leak, drive buzzer warning；
(5) capacitance and leak water detdction result are sent to computer by RS232 interface by single-chip microcomputer.
The foregoing is only the preferred embodiment of the invention, not in order to limit the invention, all at this
Within the spirit of innovation and creation and principle, any modification, equivalent substitution and improvement etc. made, should be included in the invention
Protection domain within.
Claims (6)
1. a novel fire resistant leakage sensor, it is characterised in that including:
Wave filter Digital Signals circuit (6), the signal input port of described wave filter Digital Signals circuit (6) receives
Transducing signal, the signal output port of described wave filter Digital Signals circuit (6) is electrically connected with double Second-Order Active Filters
(5) signal input port, the signal output port of described pair of Second-Order Active Filters (5) is electrically connected with Capacitance frequency conversion electricity
The signal input port on road (7)；
Controller (1), described controller (1) includes frequency computing module (102) and single-chip microcomputer (105), and described frequency calculates mould
Block (102) electrically connects with single-chip microcomputer (105), and described frequency computing module (102) is defeated with the signal of capacitive frequency change-over circuit (7)
Go out port electrical connection；
First power module (4), described first power module (4) respectively with controller (1), capacitive frequency change-over circuit (7), double
Second-Order Active Filters (5) and wave filter Digital Signals circuit (6) electrically connect, and the first power module (4) is controller
(1), capacitive frequency change-over circuit (7), double Second-Order Active Filters (5) and wave filter Digital Signals circuit (6) provide electricity
Source.
A kind of novel fire resistant leakage sensor the most according to claim 1, it is characterised in that: described controller (1) is also
Including alarm control module (101), described alarm control module (101) is electrically connected with buzzer (2).
A kind of novel fire resistant leakage sensor the most according to claim 1, it is characterised in that: described controller (1) is also
Including UART module (104), described UART module (104) connects MAX232 chip (3).
A kind of novel fire resistant leakage sensor the most according to claim 1, it is characterised in that: described Capacitance frequency conversion
Circuit (7) is electrically connected with plane capacitance (8).
A kind of novel fire resistant leakage sensor the most according to claim 1, it is characterised in that: described wave filter numeral is believed
Number control circuit (6) includes amplifier, adder, first integrator, second integral device, resistance R1-R4 and switch S1-S3, institute
State amplifier, adder and first, second integrator to be sequentially connected in series；
Described amplifier forms the anti-phase input of close loop negative feedback circuit, resistance R1 one end and amplifier with resistance R1 and resistance R2
End connects, and the other end of resistance R1 connects signal input port, and the inverting input of described amplifier is defeated with first integrator
Go out end to be connected by resistance R3, on the circuit that the inverting input of described amplifier is connected with the outfan of second integral device successively
Series resistor R4 and switch S3, the outfan of described first integrator connects signal output port；
Described adder is connected with the end of incoming cables switching S1 and S2 the most respectively, and switch S1 and S2 is two-way choice switch, switchs S1
A leading-out terminal be connected with signal input port, switch S1 another leading-out terminal connect ground wire, switch S2 an outlet
End is connected with the outfan of second integral device, and another leading-out terminal of switch S2 connects ground wire.
A kind of novel fire resistant leakage sensor the most according to claim 1, it is characterised in that: described pair of second order active filter
Ripple device (5) is MAX260 chip, and connecting between CLKA and the OSC pin of described pair of Second-Order Active Filters has crystal oscillator, its
Short circuit between CLKOUT and CLKB pin, short circuit between BPA and INB pin, INA is signal input part, and BPB is signal output
End.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620823575.8U CN205879847U (en) | 2016-07-27 | 2016-07-27 | Novel high temperature resistant water leakage sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620823575.8U CN205879847U (en) | 2016-07-27 | 2016-07-27 | Novel high temperature resistant water leakage sensor |
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| CN205879847U true CN205879847U (en) | 2017-01-11 |
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| CN201620823575.8U Active CN205879847U (en) | 2016-07-27 | 2016-07-27 | Novel high temperature resistant water leakage sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060896A (en) * | 2018-08-02 | 2018-12-21 | 盛世瑶兰（深圳）科技有限公司 | By relative dielectric constant detection for electric power box water inlet monitoring and protecting device |
| CN109187650A (en) * | 2018-10-10 | 2019-01-11 | 北京荣信慧科科技有限公司 | A kind of high reliability water-leakage detecting system |
-
2016
- 2016-07-27 CN CN201620823575.8U patent/CN205879847U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060896A (en) * | 2018-08-02 | 2018-12-21 | 盛世瑶兰（深圳）科技有限公司 | By relative dielectric constant detection for electric power box water inlet monitoring and protecting device |
| CN109187650A (en) * | 2018-10-10 | 2019-01-11 | 北京荣信慧科科技有限公司 | A kind of high reliability water-leakage detecting system |
| CN109187650B (en) * | 2018-10-10 | 2023-12-26 | 北京荣信慧科科技有限公司 | High-reliability water leakage detection system |
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