CN1595131A - Leakage liquid detecting device - Google Patents
Leakage liquid detecting device Download PDFInfo
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- CN1595131A CN1595131A CN 03157083 CN03157083A CN1595131A CN 1595131 A CN1595131 A CN 1595131A CN 03157083 CN03157083 CN 03157083 CN 03157083 A CN03157083 A CN 03157083A CN 1595131 A CN1595131 A CN 1595131A
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Abstract
It is a leakage measurement apparatus that comprises a voltage supply circuit, a leakage measurement circuit, a filer circuit, a leakage comparative circuit, a reference voltage power and a leakage signal output circuit. It is based on the liquid resistance difference measured by the leakage sensor and makes the leakage measurement circuit operation amplifier generate different voltage output and it is to compare the output voltage with the reference voltage which is served as the basis for judging whether leakage sensor is contacted with the liquid and it provides a forward bias or minus bias of transistor and makes the grounded-emitter transistor in the leakage signal circuit conduct or not conduct and pushes the relay to generate on or off signals and makes the program logic operation control circuit to generate control signals. This invention also can judge whether the leakage sensor has broken or short circuit.
Description
Technical field
The invention relates to a kind of apparatus for testing weeping,, use DC voltage and detect mode and operational amplifier so that the device of leakage measuring ability to be provided particularly about between a kind of leakage sensor (Leakage sensor) electrode.
Background technology
The leakage of liquid has a strong impact on the production equipment of incorporated business, for example Website server of setting up of the production line of semiconductor factory, network company etc.Be inevasible the today that is created in of leak of liquid under the complex environment.The leakage situation is if can not in time be found, and company and enterprise will bear the equipment loss of great number and the scene that is difficult to clear up, even may cause unforeseen danger.Therefore,, before infringement takes place, repair at once, can avoid unnecessary loss with dangerous if the situation that detects leakage that can be in good time and sounding a warning is handled.
Therefore, a kind of apparatus for testing weeping with leak of liquid measuring ability appears on the market, as shown in Figure 1, this apparatus for testing weeping 1 is to use with a leakage sensor (Leakage Sensor) 11 collocation, this leakage sensor 11 is generally positioned at computer room with terminal box 12, machine room, base station, electric panel room or reference room etc. need prevent the important place that liquid is invaded, whether there is liquid to invade this place by these leakage sensor 11 sensings, leakage sensor 11 is made of two heart yearns (figure is mark not), one termination of two heart yearns is put terminal box 12, and the insulation material that this leakage sensor 11 is blocked two heart yearn electrical connections coats, this insulation material is provided with some isolated holes, by these holes two heart yearns that are coated in the insulation material are partly exposed, to become the electrode part of this leakage sensor 11, so, when liquid contacts with this leakage sensor 11, to make two heart yearns have electrical connection, and because each class I liquid I all has specific impedance, so, can transmit the impedance of this liquid by two heart yearns of leakage sensor 11.Because leakage sensor 11 is equipped with for the standard of existing apparatus for testing weeping 1, not therefore following will be not the structure of leakage sensor 11 not being described in further detail.
This terminal box 12 is that two heart yearns with this leakage sensor 11 are connected in series respectively to the cable 13 of a tool twisted-pair feeder (130,131), twisted-pair feeder by this cable 13, make this leakage sensor 11 be serially connected in one with apparatus for testing weeping 1, with the fluid impedance that leakage sensor 11 is touched by this twisted-pair feeder, be sent to apparatus for testing weeping 1, leakage inspector 1 is given a warning, notify the related personnel to find that early important place liquid takes place invades.
Yet, use the mode that detects that exchanges between this leakage sensor (Leakage sensor) electrode of existing apparatus for testing weeping 1, easily make this cable with two heart yearns 13 and leakage sensor 11 itself form the small electric capacity that is directly proportional with its length, so, ac circuit promptly produces a condensance.So the distance of cable 13 and leakage sensor 11 is long more, the electric capacity that two heart yearns of this cable 13 and leakage sensor 11 produce can be big more, can produce Xc between the lead, make two heart yearns of cable 13 and leakage sensor 11 no longer be open-circuit condition, just, conductor spacing is long more, and the impedance meeting is dwindled gradually by infinity.
As from the foregoing, use alternating voltage between leakage sensor (Leakage sensor) electrode and detect mode, can't increase the length of cable 13 and leakage sensor 11 during to high impedance (M Ω) sensing simultaneously, therefore, when detecting mode with interchange, if need reach detection, need are shortened the length of cable 13 and leakage sensor 11 to the liquid of high impedance.
Therefore, how providing a kind of apparatus for testing weeping, when reaching the liquid sensing to high impedance, be not subjected to the restriction of the use length of cable 13 and leakage sensor 11, promptly is to need the problem that solves at present.
Summary of the invention
For overcoming the shortcoming of above-mentioned prior art, fundamental purpose of the present invention is to provide a kind of apparatus for testing weeping, is used to provide a kind of long apparatus for testing weeping that detects distance and sensing high impedance liquid that has.
A further object of the present invention is to provide a kind of apparatus for testing weeping, is used to detect the apparatus for testing weeping whether leakage sensor breaks.
Another purpose of the present invention is to provide a kind of apparatus for testing weeping, is used to detect the apparatus for testing weeping whether leakage sensor is short-circuited.
For reaching above-mentioned purpose, the invention provides a kind of apparatus for testing weeping, itself and leakage sensor (Leakage sensor) collocation with first heart yearn and second heart yearn are used, whether be used for this leakage sensor of sensing and contact with liquid, this apparatus for testing weeping comprises: one is used to supply DC voltage and obtains the voltage supply circuit that a predetermined voltage is imported; The one sensing signal input block that is electrically connected with this voltage supply circuit, and have first electrode tip and second electrode tip, first heart yearn and second heart yearn with leakage sensor electrically connects respectively, when leakage sensor contacts with liquid, to make first heart yearn and second heart yearn produce electrical connection, and make the sensing signal input block receive the impedance of the liquid that leakage sensor touches; The one leakage detecting circuit that electrically connects with this sensing signal input block, it mainly is made up of an operational amplifier, obtains an output voltage by this operational amplifier according to the received fluid impedance of sensing signal input block; One reference voltage supplies unit; The one leakage comparator circuit that electrically connects with leakage detecting circuit and reference voltage supplies unit respectively, it mainly is made up of an operational amplifier, receive the output voltage that reference voltage that reference voltage supplies unit provided and this leakage detecting circuit are exported by this operational amplifier, and the relation between the reference voltage that provided of the output voltage exported of leakage detecting circuit and reference voltage supplies unit relatively, and export a comparative voltage; And one and the leakage signal output apparatus that electrically connects of leakage comparator circuit, it is mainly by a transistor or add that a relay is formed, the switching function that whether conducts electricity as relay by this transistor, when if the comparative voltage of this leakage comparator circuit makes transistor be conducting state, to make relay power to produce a trigger pip, and then drive alarm device operation, learn that for managerial personnel the phenomenon of leakage takes place in the place that leakage sensor is set.
Have, whether apparatus for testing weeping of the present invention also can be used for this leakage sensor of sensing and contact and the phenomenon that whether breaks with liquid again, and this apparatus for testing weeping comprises: one is used to supply DC voltage and obtains the voltage supply circuit that a predetermined voltage is imported; The one sensing signal input block that is electrically connected with this voltage supply circuit, it has first electrode tip and second electrode tip, first heart yearn and second heart yearn with leakage sensor electrically connects respectively, and the end of this first heart yearn and second heart yearn is connected in series with a terminal resistance respectively, makes first electrode tip of sensing signal input block and second electrode tip receive the terminal resistance that is connected in series with first heart yearn and second heart yearn; And when leakage sensor contacts with liquid, will make first electrode tip of sensing signal input block and second electrode tip receive the impedance of the liquid that leakage sensor touches; One leakage/broken string the detecting circuit that electrically connects with the sensing signal input block, it mainly is made up of an operational amplifier, obtains an output voltage by this operational amplifier according to this sensing signal input block received fluid impedance and terminal resistance; One is used to provide the reference voltage supplies unit of a leakage reference voltage and a broken string reference voltage; The one leakage comparator circuit that electrically connects with this leakage/broken string detecting circuit and reference voltage supplies unit respectively, it mainly is made up of an operational amplifier, leakage reference voltage that is provided by this operational amplifier reception reference voltage supplies unit and the output voltage that leakage/the broken string detecting circuit is exported, and the relation between the leakage reference voltage that provided of the output voltage that relatively leakage/the broken string detecting circuit is exported and reference voltage supplies unit, and export a leakage comparative voltage; The one broken string comparator circuit that electrically connects with leakage/broken string detecting circuit and reference voltage supplies unit respectively, it mainly is made up of an operational amplifier, receive broken string reference voltage that reference voltage supplies unit provided and the output voltage that leakage/the broken string detecting circuit is exported by this operational amplifier, and the relation between the broken string reference voltage that provided of the output voltage that relatively leakage/broken string detecting circuit is exported and reference voltage supplies unit, and export the comparative voltage that breaks; The one leakage signal output apparatus that electrically connects with this leakage comparator circuit, it is mainly by a transistor or add that a relay forms, the switching function that whether conducts electricity as relay by this transistor, when if the leakage comparative voltage of this leakage comparator circuit makes transistor be conducting state, to make relay power to produce a trigger pip, and then drive a FPGA (Field Programmable Gate Array) arithmetic and control unit (Programmable Logic Controller, PLC) circuit operation learns that for managerial personnel the phenomenon of leakage takes place in the place that leakage sensor is set; And one and the disconnection signal output circuit that electrically connects of this broken string comparator circuit, it is mainly by a transistor or add that a relay is formed, the switching function whether this transistor conducts electricity as relay, when if the broken string comparative voltage of broken string comparator circuit makes transistor be conducting state, to make relay power to produce a trigger pip, and then order about alarm device operation, learn that for managerial personnel leakage sensor breaks.
In sum, apparatus for testing weeping of the present invention has the long characteristics that detect distance and sensing high impedance.In addition, can detect this leakage sensor by this broken string comparator circuit and broken string detecting signal self-hold circuit whether breaking phenomena takes place; Have again, also can detect this leakage sensor phenomenon that whether is short-circuited by this short-circuit signal comparator circuit.
Description of drawings
Fig. 1 is the application synoptic diagram of general apparatus for testing weeping;
Fig. 2 is the basic framework block schematic diagram of apparatus for testing weeping embodiment 1 of the present invention;
Fig. 3 is the detailed circuit diagram of Fig. 2 embodiment 1;
Fig. 4 is the basic framework block schematic diagram of the embodiment 2 of apparatus for testing weeping of the present invention;
Fig. 5 is the detailed circuit diagram of Fig. 4 embodiment 2;
Fig. 6 is the basic framework block schematic diagram of the embodiment 3 of apparatus for testing weeping of the present invention; And
Fig. 7 is the detailed circuit diagram of Fig. 6 embodiment 3.
Embodiment
Embodiment 1
Fig. 2 is the basic framework block schematic diagram of apparatus for testing weeping embodiment 1 of the present invention.As shown in the figure, the apparatus for testing weeping 2 of present embodiment 1 comprises a voltage supply circuit 20, a leakage detecting circuit 21, a filtering circuit 22, a leakage comparator circuit 23, a reference voltage source 24 and a leakage signal output apparatus 25 at least.Please be simultaneously with reference to Fig. 3, it is the detailed circuit diagram of the preferable example of Fig. 2.
This voltage supply circuit 20 is used to receive the voltage signal Vin by external world's input, and be a predetermined voltage signals VR2 with its dividing potential drop, so that obtaining power supply, this apparatus for testing weeping 2 can move, this voltage signal VR2 provides voltage Vab between 11 liang of electrode tips of leakage sensor (A, B), this voltage Vab=-(R4/R3) * VR2 by operational amplifier A mp (being an inverting amplifier); Wherein when voltage signal Vin imports, make LED 1 luminous, make managerial personnel learn that this apparatus for testing weeping 2 is in the power supply user mode.
The leakage detecting circuit 21 that is connected with this voltage supply circuit 20 is made up of two electrode tips (A, B), an adjustable resistance VR and an operational amplifier A mp1, to form a see-saw circuit.Two electrode tip (A, B) respectively with two heart yearns (110 of this leakage sensor 11,111) connect, because this leakage sensor 11 and a determinand 3 (just a certain liquid) are when contacting, this two heart yearns (110 of 11 will be made, 111) form conducting state, and this two heart yearn (110,111) utilize conducting state, the impedance (Rdet) of determinand 3 is sent to apparatus for testing weeping 2, just make these leakage detecting circuit 21 outputs one voltage Vdet, because this leakage detecting circuit 21 mainly is made up of an operational amplifier A mp1, so the output end voltage Vdet=-of this operational amplifier A mp1 (VR/ (Rdet+R5)) * Vab; In the present embodiment, this voltage Vdet is a positive voltage; When not having liquid to invade leakage sensor 11, just two heart yearns (110,111) are open-circuit condition, will make the impedance Rdet of this determinand 3 for infinitely great, so voltage Vdet is almost nil.Then, this leakage detecting circuit 21 reaches the voltage Vdet of output in the filtering circuit 22, AC noise beyond the d. c. voltage signal of these filtering circuit 22 filtering leakage detecting circuits 21 outputs is disturbed, and in the present embodiment, this filtering circuit 22 is resistance-capacitor filter.
This leakage comparator circuit 23 mainly is made up of operational amplifier A mp2, negative (-) input end of this operational amplifier A mp2, be used to receive that reference voltage source 24 provided, and through the reference voltage VR10 of dividing potential drop gained, and just (+) input end is used to receive through filtering circuit 22 ' the remove voltage VR7 of denoising gained, wherein this reference voltage VR10 remains unchanged, and this voltage VR7 is variation according to the determinand 3 impedance Rdet of leakage detecting circuit 21 different voltage swings is arranged, as voltage VR7 during greater than reference voltage VR10, the voltage Vo of the output terminal of operational amplifier A mp2 output is a positive voltage; Otherwise as this voltage VR7 during less than reference voltage VR10, the voltage Vo that the output terminal of operational amplifier A mp2 is exported is a negative voltage, then, voltage Vo is reached this leakage signal output apparatus 25.
Common emitter circuit and relay (Relay) 250 that this leakage signal output apparatus 25 mainly is made of NPN transistor T2 are formed the switching function whether this transistor T 2 conducts electricity as relay 250.If the comparative voltage Vo that operational amplifier A mp2 is exported is timing, then make this diode D1 conducting, and make LED 2 produce light source, on the other hand, this NPN transistor T2 is conducting state because of being in positive bias, makes relay 250 energisings, so produce a trigger pip, and then (phenomenon of leakage takes place in the place that managerial personnel is learnt leakage sensor 11 is set for ProgrammableLogic Controller, PLC) circuit 26 operation to drive a FPGA (Field Programmable Gate Array) arithmetic and control unit.Since electronic component and PLC circuit the electronic equipment for generally know of relay 250 for generally knowing, not therefore following will its function and inside structure not being described further.
In the present embodiment, the adjustable resistance VR of this leakage detecting circuit 21, between 0 Ω to 1M Ω, adjust according to determinand impedance Rdet for managerial personnel, so the determinand impedance Rdet that can sense is at least 60M Ω cm, and the detection distance that this apparatus for testing weeping 2 provides also can reach 1 kilometer at least.What this must illustrate be, the impedance of this adjustable resistance VR is not limited to 1M Ω, needs decide according to example, and for example, managerial personnel will survey higher determinand impedance Rdet, then can use higher adjustable resistance VR.
Embodiment 2
Fig. 4 is the basic framework block schematic diagram of apparatus for testing weeping embodiment 2 of the present invention; The apparatus for testing weeping 2 of present embodiment ' comprise an at least voltage supply circuit 20, a leakage/broken string detecting circuit 21 ', a filtering circuit 22 ', a leakage comparator circuit 23 ', a reference voltage source 24, a leakage signal output apparatus 25, a broken string comparator circuit 27, a broken string detecting signal self-hold circuit 28 and a disconnection signal output circuit 29.Please be simultaneously with reference to Fig. 5, it is the detailed circuit diagram of this embodiment 2 of Fig. 4.As shown in the figure, wherein except that leakage/broken string detecting circuit 21 ', leakage comparator circuit 23 ', the broken string comparator circuit 27, broken string detecting signal self-hold circuit 28 and disconnection signal output circuit 29, connection between other circuit and operational relation and Fig. 3 are roughly the same, so no longer explanation.
The apparatus for testing weeping 2 of present embodiment ' characteristics be, by this broken string comparator circuit 27 and broken string detecting signal self-hold circuit 28, make managerial personnel can learn whether leakage sensor 11 fracture takes place or phenomenon such as come off.
Present embodiment is to reach to make managerial personnel learn that the purpose of broken string takes place leakage sensor 11 in real time, the end of this leakage sensor 11 must connect a terminal resistance Rf (its resistance is a definite value), so, the voltage Vdet of this leakage/broken string detecting circuit 21 ' output will have the voltage output of three kinds of states of normal condition, leakage state and broken string state, wherein, normal condition does not have liquid to invade leakage sensor 11, then this voltage Vdet=-(VR/ (Rf+R5)) * Vab exactly; The leakage state is exactly that liquid is invaded leakage sensor 11, then this voltage Vdet=-(VR/ (Rf//Rdet)+R5) * Vab; The broken string state is exactly that this leakage sensor 11 is the broken string state, and then this voltage Vdet=-(VR/ (Rf+R5)) * Vab wherein, is infinitely great owing to make impedance Rf for the broken string state, so voltage Vdet is zero volt.
This leakage comparator circuit 23 ' mainly form by operational amplifier A mp2 ', negative (-) input end of this operational amplifier A mp2 ', it is that provide and through the leakage reference voltage VR10 of dividing potential drop gained to be used to receive reference voltage source 24, and just (+) input end is used to receive the voltage VR7 of gained behind filtering circuit 22 ' remove denoising, wherein this leakage reference voltage VR10 remains unchanged, and voltage VR7 has different voltage, the output of just above-mentioned three kinds of of-state voltages (Vdet) according to the variation of the determinand 3 impedance Rdet of leakage detecting circuit 21.As this voltage VR7 during greater than leakage reference voltage VR10, the voltage Vo1 that the output terminal of operational amplifier A mp2 ' is exported is a positive voltage; Otherwise as voltage VR7 during less than leakage reference voltage VR10 and greater than broken string reference voltage VR15, the voltage Vo1 that the output terminal of this operational amplifier A mp2 ' is exported is a negative voltage, and then, Vo1 reaches leakage signal output apparatus 25 with this voltage.Must explanation be because the leakage signal output apparatus 25 of present embodiment is identical with leakage signal output apparatus 25 principle of work shown in Figure 3, thus below no longer narrate.
This broken string comparator circuit 27 mainly is made up of an operational amplifier A mp3, just (+) input end of this operational amplifier A mp3, it is that provided and through the broken string reference voltage VR15 of dividing potential drop gained to be used to receive reference voltage source 24, and negative (-) input end is used to receive the voltage VR7 of gained behind filtering circuit 22 ' remove denoising, wherein, voltage VR7 is that the variation according to the determinand 3 impedance Rdet of this leakage detecting circuit 21 has different voltage, the output of just above-mentioned three kinds of of-state voltages (Vdet).As voltage VR7 during greater than broken string reference voltage VR15, the voltage Vo2 that the output terminal of operational amplifier A mp3 is exported is a negative voltage; Otherwise as voltage VR7 during less than broken string reference voltage VR15, the voltage Vo2 that the output terminal of operational amplifier A mp3 is exported is a positive voltage, then, voltage Vo2 is reached broken string detecting signal self-hold circuit 28.What must illustrate is that above-mentioned leakage reference voltage VR10 must be greater than broken string reference voltage VR15.
This broken string detecting signal self-hold circuit 28 mainly is made up of RS flip-flop 280, the input end S of this RS flip-flop is used to receive the broken string comparative voltage that this broken string comparator circuit is exported, voltage Vo2 with broken string comparator circuit 27 is exported finishes broken string detecting signal self-retaining function by this RS flip-flop 280.The fundamental purpose of this function is, when disconnection signal detects, represent that promptly leakage sensor 11 breaks, and before leakage sensor 11 is not finished in succession program, disconnection signal will keep always, make the output terminal Q of RS flip-flop continue the output disconnection signal, also can't remove disconnection signal even press the switch SW that is connected with the input end R of this RS flip-flop 280.If need to remove disconnection signal, the leakage sensor 11 that at first must will break connects to be finished, and then, presses switch SW again and can remove disconnection signal.So, can when leakage sensor 11 produces the broken string phenomenon, managerial personnel be learnt immediately, can confirm effectively also whether the broken string phenomenon of this leakage sensor 11 is got rid of.
Common emitter circuit and relay (Relay) 290 that this disconnection signal output circuit 29 mainly is made of NPN transistor T3 are formed the switching function whether this transistor T 3 conducts electricity as relay 290.When if the operational amplifier A mp3 output terminal output voltage V o2 of broken string comparator circuit 27 is positive voltage, then make diode D2 conducting, and make LED 3 produce light source, on the other hand, this NPN transistor T3 is conducting state because of being in positive bias, makes relay 290 energisings so produce a trigger pip, and then drives a late-class circuit (figure is mark not), for example the PLC circuit start so makes managerial personnel learn that the broken string phenomenon takes place this leakage sensor 11.
Embodiment 3
Fig. 6 is the basic framework block schematic diagram of apparatus for testing weeping embodiment 3 of the present invention; With reference to Fig. 7, it is that Fig. 6 implements 3 detailed circuit diagram simultaneously.As shown in the figure, wherein remove reference voltage source 30 and short-circuit signal comparator circuit 31, connection between other circuit and operational relation and Fig. 3 are roughly the same, so no longer explanation.
The apparatus for testing weeping 2 of present embodiment 3 " characteristics be; " judge that its output voltage is that leakage takes place for leakage sensor 11 short circuits or the scene that this leakage sensor 11 is installed by the operation of this reference voltage source 30, short-circuit signal comparator circuit 31 and short-circuit signal output circuit 32; make apparatus for testing weeping 2, learn the field condition of this installation leakage sensor 11 for managerial personnel, thereby make respective handling.
Need adjustable resistance VR in the present embodiment with the leakage detecting circuit 21 of Fig. 3, change fixed resistance R19 into, and the resistance value of the resistance R 5 in the resistance value of this fixed resistance R19 and the voltage supply circuit 20 is identical, so if determinand impedance Rdet is 0 o'clock (just this leakage sensor 11 is short circuit phenomenon), leakage detecting circuit 21 can obtain maximum output voltage Vdet, be Vdet=-(R19/ (R5+Rdet)) * Vab, and this maximum output voltage Vdet is similar to voltage Vab, so voltage VR7 can obtain maximum dividing potential drop.
Then, provide a reference voltage source 30 by a bleeder circuit, wherein, dividing potential drop by resistance R 16 provides short-circuit signal reference voltage VR16, and this short-circuit signal reference voltage VR16 is that the voltage VR7 that exported of the leakage detecting circuit 21 of 0 o'clock (just this leakage sensor 11 is short circuit phenomenon) is close with determinand impedance Rdet in theory.Just, determinand impedance Rdet is voltage Vdet=-(R19/ (R5+Rdet)) * Vab of 0, the determinand impedance Rdet of this moment is promptly less than the general intrinsic impedance of liquid, just, the resistance value of convergence short circuit, and when setting this short-circuit signal reference voltage VR16, Rdet is more little in the determinand impedance, the short-circuit signal that then records is accurate more, and so, this short-circuit signal reference voltage VR16 then sets as reference voltage with voltage VR7.
This short-circuit signal comparator circuit 31 mainly is made up of an operational amplifier A mp4, just (+) input end of this operational amplifier A mp4, be used to receive the voltage VR7 that removes the denoising gained through filtering circuit 22, and negative (-) input end to be used to receive reference voltage source 30 that provided and through the short-circuit signal reference voltage VR16 of dividing potential drop gained.As voltage VR7 during greater than short-circuit signal reference voltage VR16, the voltage that the output terminal of operational amplifier A mp4 is exported is positive voltage, the output voltage signal of promptly representing this leakage detecting circuit 21 is the signal that the phenomenon of leakage does not take place, and is the be short-circuited signal of phenomenon of leakage sensor 11; Otherwise as voltage VR7 during less than short-circuit signal reference voltage VR16, the voltage that the output terminal of this operational amplifier A mp4 is exported is negative voltage, and the output voltage signal of promptly representing this leakage detecting circuit 21 is for the signal of the phenomenon of leakage takes place.Then, this short-circuit signal comparator circuit 31 is sent to short-circuit signal output circuit 32 with the voltage signal that operational amplifier A mp4 is exported, what this must illustrate be, because so the leakage signal output apparatus 25 of this short-circuit signal output circuit 32 and Fig. 3 and identical with the principle of work of the disconnection signal output circuit 29 of Fig. 5 is no longer explanation.
In sum, the difference of the fluid impedance that apparatus for testing weeping of the present invention is sensed according to leakage sensor 11 (Rdet of determinand impedance just), make the operational amplifier A mp1 in the leakage detecting circuit 21 produce different voltage Vdet output, and the voltage that will export and a reference voltage source compare, with the judgment basis that whether contacts as leakage sensor 11 with liquid, and then provide a positive bias-voltage, make the common emitter circuit conducting of the transistor T 2 in the leakage signal output apparatus 25, promote the signal that relay 250 produces On or Off, produce control signal to make PLC circuit 26.Therefore, the invention provides a kind of liquid to high impedance carries out sensing and has the long apparatus for testing weeping that detects distance simultaneously; In addition, utilize this broken string comparator circuit 27 and broken string detecting signal self-hold circuit 28 that a kind of apparatus for testing weeping whether this leakage sensor 11 breaking phenomena takes place that detects can be provided; Have again, utilize this short-circuit signal comparator circuit 31 that a kind of whether be short-circuited apparatus for testing weeping of phenomenon of this leakage sensor 11 that detects also can be provided.
Claims (12)
1. apparatus for testing weeping, whether itself and a leakage sensor collocation with first heart yearn and second heart yearn are used, be used for this leakage sensor of sensing and contact with liquid, it is characterized in that this apparatus for testing weeping comprises:
One voltage supply circuit is used to supply DC voltage and obtains predetermined voltage input;
One sensing signal input block, itself and this voltage supply circuit is electrically connected, and have first electrode tip and second electrode tip, first heart yearn and second heart yearn with this leakage sensor electrically connects respectively, when leakage sensor contacts with liquid, to make first heart yearn and second heart yearn produce electrical connection, and make this sensing signal input block receive the impedance of the liquid that leakage sensor touches;
One leakage detecting circuit, itself and this sensing signal input block electrically connects, and mainly is made up of an operational amplifier, obtains an output voltage by the fluid impedance that this operational amplifier receives according to the sensing signal input block;
One reference voltage supplies unit;
One leakage comparator circuit, it electrically connects with leakage detecting circuit and reference voltage supplies unit respectively, mainly form by an operational amplifier, receive the reference voltage that reference voltage supplies unit provides and the output voltage of leakage detecting circuit output by this operational amplifier, and the relation between the reference voltage that provided of the output voltage exported of leakage detecting circuit and reference voltage supplies unit relatively, and export a comparative voltage; And
One leakage signal output apparatus, itself and leakage comparator circuit electrically connect, mainly form by an on-off element, when if the comparative voltage of leakage comparator circuit makes on-off element be conducting state, to produce a trigger pip, and then drive alarm device operation, learn that for managerial personnel the phenomenon of leakage takes place in the place that leakage sensor is set.
2. apparatus for testing weeping, whether itself and a leakage sensor collocation with first heart yearn and second heart yearn are used, be used for this leakage sensor of sensing and contact and the phenomenon that whether breaks with liquid, it is characterized in that this apparatus for testing weeping comprises:
One voltage supply circuit is used to supply DC voltage and obtains predetermined voltage input;
One sensing signal input block, itself and voltage supply circuit are electrically connected, and have first electrode tip and second electrode tip, first heart yearn and second heart yearn with this leakage sensor electrically connects respectively, and the end of this first heart yearn and second heart yearn is connected in series with a terminal resistance respectively, make first electrode tip and second electrode tip of this sensing signal input block, receive the terminal resistance that is connected in series with this first heart yearn and second heart yearn; And when this leakage sensor contacts with liquid, make first electrode tip and second electrode tip of this sensing signal input block, receive the impedance of the liquid that this leakage sensor touches;
One leakage/broken string detecting circuit, itself and sensing signal input block electrically connect, and mainly are made up of an operational amplifier, obtain an output voltage by this operational amplifier according to sensing signal input block received fluid impedance and terminal resistance;
One reference voltage supplies unit is used to provide a leakage reference voltage and a broken string reference voltage;
One leakage comparator circuit, it electrically connects with leakage/broken string detecting circuit and reference voltage supplies unit respectively, mainly form by an operational amplifier, receive the output voltage that leakage reference voltage that reference voltage supplies unit provides and leakage/broken string detecting circuit are exported by this operational amplifier, and the relation between the leakage reference voltage that provided of the output voltage that relatively this leakage/the broken string detecting circuit is exported and this reference voltage supplies unit, and export a leakage comparative voltage;
One broken string comparator circuit, it electrically connects with leakage/broken string detecting circuit and reference voltage supplies unit respectively, mainly form by an operational amplifier, receive the output voltage that broken string reference voltage that reference voltage supplies unit provides and leakage/broken string detecting circuit are exported by this operational amplifier, and the relation between the output voltage of relatively leakage/broken string detecting circuit output and broken string reference voltage that the reference voltage supplies unit provides, and export the comparative voltage that breaks;
One leakage signal output apparatus, itself and this leakage comparator circuit electrically connects, mainly form by one first on-off element, if the leakage comparative voltage of this leakage comparator circuit, when making first on-off element be conducting state, to produce a trigger pip, and then drive the operation of first alarm device, learn that for managerial personnel the phenomenon of leakage takes place in the place that leakage sensor is set; And
One disconnection signal output circuit, itself and this broken string comparator circuit electrically connects, mainly form by a second switch element, if the broken string comparative voltage of this broken string comparator circuit, when making the second switch element be conducting state, to produce a trigger pip, and then drive the operation of second alarm device, learn that for managerial personnel this leakage sensor breaks.
3. apparatus for testing weeping as claimed in claim 1 is characterized in that this apparatus for testing weeping also has a filtering circuit, and itself and this leakage detecting circuit electrically connects, and is used to remove the output voltage noise in addition that this leakage detecting circuit is exported.
4. apparatus for testing weeping as claimed in claim 2, it is characterized in that, this apparatus for testing weeping also has a filtering circuit, and itself and this leakage/broken string detecting circuit electrically connects, and is used to remove the output voltage noise in addition that this leakage/the broken string detecting circuit is exported.
5. apparatus for testing weeping as claimed in claim 2 is characterized in that, this leakage reference voltage must be greater than the broken string reference voltage.
6. apparatus for testing weeping as claimed in claim 2, it is characterized in that, this apparatus for testing weeping also has a broken string detecting signal self-hold circuit, itself and this broken string comparator circuit electrically connects, mainly form by a RS flip-flop, the input end S of this RS flip-flop is used to receive the broken string comparative voltage that this broken string comparator circuit is exported, the broken string comparative voltage of being exported when this broken string comparator circuit is a disconnection signal, and when this leakage sensor still is the broken string state, the output terminal Q that makes the RS flip-flop is continued the output disconnection signal, to reach broken string detecting signal self-retaining function by this RS flip-flop.
7. whether apparatus for testing weeping as claimed in claim 6 is characterized in that, connects an on-off element at the input end R of this RS flip-flop, be used for pushing this on-off element for managerial personnel and remove with the broken string phenomenon of learning this leakage sensor.
8. apparatus for testing weeping as claimed in claim 1 is characterized in that, this apparatus for testing weeping also comprises:
One short-circuit signal reference voltage supplies unit;
One short-circuit signal comparator circuit, it electrically connects with this leakage detecting circuit and short-circuit signal reference voltage supplies unit respectively, mainly form by an operational amplifier, the output voltage of being exported with the short-circuit signal reference voltage that receives this short-circuit signal reference voltage supplies unit and provided and this leakage detecting circuit by this operational amplifier, and the relation between the short-circuit signal reference voltage that provided of the output voltage exported of this leakage detecting circuit and this short-circuit signal reference voltage supplies unit relatively, and export a short-circuit signal comparative voltage; And
One short-circuit signal output circuit, itself and this short-circuit signal comparator circuit electrically connects, mainly form by a second switch element, when if the short-circuit signal comparative voltage of this short-circuit signal comparator circuit makes the second switch element be conducting state, to produce a trigger pip, and then drive one second alarm device operation, learn this leakage sensor phenomenon that is short-circuited for managerial personnel.
9. as claim 1,2 or 8 described apparatus for testing weeping, it is characterized in that this alarm device is meant a kind of in FPGA (Field Programmable Gate Array) arithmetic and control unit and the light emitting diode.
10. as claim 1,2 or 8 described apparatus for testing weeping, it is characterized in that the on-off element of this signal output apparatus mainly is made up of a transistor and a relay, the switching function whether this transistor conducts electricity as relay.
11., it is characterized in that the on-off element of this signal output apparatus mainly is made up of a transistor as claim 1,2 or 8 described apparatus for testing weeping.
12., it is characterized in that the on-off element of this signal output apparatus mainly is made up of a relay as claim 1,2 or 8 described apparatus for testing weeping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03157083 CN1284968C (en) | 2003-09-12 | 2003-09-12 | Leakage liquid detecting device |
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| CN 03157083 CN1284968C (en) | 2003-09-12 | 2003-09-12 | Leakage liquid detecting device |
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| CN1595131A true CN1595131A (en) | 2005-03-16 |
| CN1284968C CN1284968C (en) | 2006-11-15 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100553095C (en) * | 2006-12-21 | 2009-10-21 | 中国科学院电工研究所 | A kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection |
| CN100561159C (en) * | 2006-12-06 | 2009-11-18 | 中国科学院电工研究所 | A kind of apparatus for testing weeping of plastic fluid container |
| CN103158069A (en) * | 2011-12-12 | 2013-06-19 | 北京中电科电子装备有限公司 | Protective device and method of electric main shaft and thinning machine |
| CN103644458A (en) * | 2013-11-08 | 2014-03-19 | 上海华力微电子有限公司 | Leaked liquid detection device |
| CN103728950A (en) * | 2014-01-03 | 2014-04-16 | 合肥彩虹蓝光科技有限公司 | Online liquid leakage monitoring device |
| CN103834562A (en) * | 2014-01-07 | 2014-06-04 | 中国人民解放军第三军医大学第二附属医院 | In-vitro ocular anterior segment tissue culture device |
| CN107607593A (en) * | 2017-07-24 | 2018-01-19 | 珠海格力电器股份有限公司 | Liquid leakage detection device and method and water treatment equipment |
| CN108709090A (en) * | 2018-05-07 | 2018-10-26 | 刘国青 | Water leakage monitoring device and system |
| 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 |
| CN109730361A (en) * | 2019-01-25 | 2019-05-10 | 深圳麦克韦尔股份有限公司 | A kind of electronic atomized equipment and its leakage monitoring method |
| CN110081320A (en) * | 2019-04-11 | 2019-08-02 | 苏州浪潮智能科技有限公司 | A kind of liquid cooling system apparatus for testing weeping and detection method |
| CN112946350A (en) * | 2021-03-02 | 2021-06-11 | 台山核电合营有限公司 | Single-phase voltage stability monitoring alarm circuit and device |
| CN113495821A (en) * | 2020-04-03 | 2021-10-12 | 华为技术有限公司 | Device and method for detecting liquid leakage and cabinet system |
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2003
- 2003-09-12 CN CN 03157083 patent/CN1284968C/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561159C (en) * | 2006-12-06 | 2009-11-18 | 中国科学院电工研究所 | A kind of apparatus for testing weeping of plastic fluid container |
| CN100553095C (en) * | 2006-12-21 | 2009-10-21 | 中国科学院电工研究所 | A kind of high-frequency and high-voltage power supply that is used for the leakage of plastic liquid container detection |
| CN103158069A (en) * | 2011-12-12 | 2013-06-19 | 北京中电科电子装备有限公司 | Protective device and method of electric main shaft and thinning machine |
| CN103644458A (en) * | 2013-11-08 | 2014-03-19 | 上海华力微电子有限公司 | Leaked liquid detection device |
| CN103644458B (en) * | 2013-11-08 | 2016-01-27 | 上海华力微电子有限公司 | Liquid leakage detection device |
| CN103728950A (en) * | 2014-01-03 | 2014-04-16 | 合肥彩虹蓝光科技有限公司 | Online liquid leakage monitoring device |
| CN103834562A (en) * | 2014-01-07 | 2014-06-04 | 中国人民解放军第三军医大学第二附属医院 | In-vitro ocular anterior segment tissue culture device |
| CN103834562B (en) * | 2014-01-07 | 2016-03-23 | 中国人民解放军第三军医大学第二附属医院 | In vitro anterior ocular segment tissue culture device |
| CN107607593A (en) * | 2017-07-24 | 2018-01-19 | 珠海格力电器股份有限公司 | Liquid leakage detection device and method and water treatment equipment |
| CN108709090A (en) * | 2018-05-07 | 2018-10-26 | 刘国青 | Water leakage monitoring device and system |
| CN108709090B (en) * | 2018-05-07 | 2024-04-05 | 刘国青 | Water leakage monitoring device and system |
| 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 |
| CN109730361A (en) * | 2019-01-25 | 2019-05-10 | 深圳麦克韦尔股份有限公司 | A kind of electronic atomized equipment and its leakage monitoring method |
| CN110081320A (en) * | 2019-04-11 | 2019-08-02 | 苏州浪潮智能科技有限公司 | A kind of liquid cooling system apparatus for testing weeping and detection method |
| CN110081320B (en) * | 2019-04-11 | 2021-05-25 | 苏州浪潮智能科技有限公司 | Liquid leakage detection device and detection method for liquid cooling system |
| CN113495821A (en) * | 2020-04-03 | 2021-10-12 | 华为技术有限公司 | Device and method for detecting liquid leakage and cabinet system |
| CN112946350A (en) * | 2021-03-02 | 2021-06-11 | 台山核电合营有限公司 | Single-phase voltage stability monitoring alarm circuit and device |
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