CN1936414A - Non-conductive material water-supply pipeline leak-detection method - Google Patents

Abstract

This invention relates to a method for testing leakage of supplying pipelines of non-conduction materials, which sets many connected electrodes in walls of pipelines of different regions of non-conducting materials buried away from ordinary metal pipelines as one pole of conduction and sets many electrodes to be connected one by one outside of the pipeline walls of different regions as the other pole, thus, ordinarily, leakage does not happen and the resistance between electrodes inside and outside of the pipe is large, the device does not alarm at the time, when leakage happens, water infiltrates into the earth and resistance of the electrodes buried in the earth reduces greatly and the device alarms because of small resistance.

Description

Non-conductive material water-supply pipeline leak-detection method

Technical field

A kind of water-supply pipeline leak-detection method, especially non-conductive material water-supply pipeline leak-detection method.

Background technique

Leak hunting method for non-conductive material water-supply pipeline, the method that solves is the same with the common metal pipeline at present, normally adopt the leakage method of listening, when night, the people was quiet, adopt and listen the leakage device, probe is close on the nearest ground of pipeline, the faint sound wave that leaks is amplified, pass to then in the receiver, the message that makes the people obtain leaking.But this way is known often that having had leaks and is just taked, and generally can often not carry out at ordinary times, does not also have very big assurance even listen to leak, especially the pipeline distance of coming out from water factory is very long, bury very deeply, ground condition complexity is only with listening the leakage method still can not solve seepy question.

Summary of the invention

The objective of the invention is: propose a kind of method that non-conductive material water-supply pipeline leaks that is used for detecting.

The object of the present invention is achieved like this: it is with to detect the resistance that the comparison back produces one by one poor because of the low resistance of two interpolars that leak between high value of resistance and inside and outside two electrodes when leaking between two electrodes inside and outside when water-tight in the variant zone, newspaper as the current measuring instrument device leaks the signal source, it is characterized in that: being embedded in the variant regional tube wall in the underground non-conductive material water-supply pipeline after leaving common metallic conduit one segment distance is provided with many continuous electrodes, utmost point as conduction, outside the tube wall in the variant zone of non-conductive material water-supply pipeline, the many electrodes that can connect one by one are set, as another utmost point of conduction.

Like this, although the common metal pipeline is a ground connection, the insulation resistance on water in its pipe and ground is also less, but it is to connect by pipeline and electrode that long one section insulating material is made for the water in the metallic conduit, therefore the ducted water made of insulating material be by long segment distance water resistance just and the earth communicate, do not leak at ordinary times, the resistance between the pipe internal and external electrode is just bigger, if instrument is not reported to the police when input resistance is big, otherwise reports to the police; And when take place leaking, owing to leak and penetrate in the earth, the tube wall external electrode that is inserted in the earth and the electrode in the tube wall have been shortened because of the interior electrode of the pipe that leaks and manage path between the external electrode, thereby resistance descends greatly, then this moment, instrument was reported to the police because of resistance is little, thereby reached goal of the invention.

Description of drawings

Fig. 1 is a structure principle chart.

Fig. 2 adopts the circuit theory diagrams of tour formula electronic leak detector as the current measuring instrument device.

Embodiment

Among Fig. 11 is the output line joint, promptly is of tube wall external electrode, the 2nd, and the receiver output line; the 3rd, feed back line, the 4th, power line, the 5th, impulse line; the 6th, make an inspection tour pulse receiver; the 7th, receiver outer protective cover, the 8th, output line guard bar, the 8th, non-conducting material water pipe; the 10th, nut; the 11st, insulation lighting outlet, the 12nd, bolt, the 13rd, outer wall isolation valve; the 14th, the current measuring instrument device; the 15th, advance the water iron pipe, the 16th, iron pipe and non-conducting material pipe connecting bolt, the 17th, do not establish the non-conducting material water pipe of electrode inside and outside the pipe; the 18th, valve pit; the 19th, circle is filled out in the insulation that lead is put in inside, and the 20th, a chain of, the 21st, earth.Among the figure 1 is as the output line joint that is in the outer detecting head of conduction one utmost point of non-conductive material water-supply pipeline, all be furnished with such output line joint in each zone, the receiver output line 2 of ining succession on the connector lug, there is one deck output line guard bar 8 its outside, output line 2 is drawn by making an inspection tour in the pulse receiver 6, make an inspection tour pulse oscillator safety cover 7 is arranged outward, each is maked an inspection tour pulse oscillator and also and between the current measuring instrument device 14 is communicated with except the insulated conductor connection is arranged mutually, the power line that is communicated with useful 4 expressions in the line, the impulse line of 5 expressions; There is one to feed back line 3 in non-conductive material water-supply pipeline 9 inside, it promptly is another utmost point of conduction, feed back line and in tube wall, pass through grommet 19, guide into outside the pipe, it is surrounded by the insulated conductor 11 of isolation layer and is communicated with current measuring instrument device 14 outside becoming outside pipe, nut 10 and bolt 12 are with connecting ring 20 and 13 tensions of outer wall insulation valve, and grommet 19 is clamped in wherein, because grommet is soft sealing material, so it also plays the seal action to water, insulation valve 13 general employing insulating material are made or are coated isolation layer at the metal valve outer wall, its the right is the linkage structure identical with the left side, valve is connected to the non-conductive material water-supply pipeline of not placing the feedback line with 17 one section the inside representing, but the right-hand member of this pipeline is connected by the common pipe fitting 15 that firmware 16 is made it and conductive material, among the figure 18 is valve pits of placing valve, the 21st, and earth.Feedback line 3 among the figure is in pipeline as when running into valve, can in all adopting as Fig. 1, the both sides of valve inner insulation of putting lead fill out circle 19, make feedback line 3 walk around valve, can also take from the wall of isolation valve, to insert methods such as lead in addition, make the feedback line not hinder closing of valve.

Fig. 2 adopts the circuit theory diagrams of tour formula electronic leak detector as the current measuring instrument device.The inner current measuring instrument device circuit that divides in the presentation graphs 1 of dotted line among the figure, dotted line outside are divided into the tour pulse receiver 6 (hereinafter to be referred as receiver) that is connected among Fig. 1 and the output line of being drawn by it, output line detecting head, power line, impulse line and feed back line.X in the dotted line is for making an inspection tour the pulse cycle digital display instrument, F is a pulse oscillator, and K is the switching circuit that can the control impuls electric current passes through, and B is a warning circuit, Z is the warning light in the warning circuit, as the J that feeds back the signal recorder with door Y and conduct that has that feeds back the signal processing, S counts positioning work piece, and L is an error correction interception switch, q is the contrast electric bridge, P is a relay, and P1 is the contact that is subjected to relay control, and BP is half frequency device.The uppermost line in frame of broken lines right side is to enter the impulse line of respectively making an inspection tour pulse receiver by the diode D1 that passes through that pulse oscillator sends, IC1 to IC3 promptly is the count integration block of three 4017 classes, each integrated package here can both play the said receiver effect in front, therefore as the integrated package of receiver actual have many, only draw among the figure three, M pin on the integrated package is the zero setting pin, the N pin is the pulse signal input pin, 2, the 3rd, the counting output pin, and the 1st pin is the initial pin of each integrated package, when+when 5V powers to integrated package, each integrated package first pin all has voltage output, and (adopting 4017 o'clock actual the 3rd pin is initial pin, here 1,2,3 pin are only represented the sequencing exported) therefore all the other integrated packages all are in the value nought state owing to the M pin has positive electricity except that IC1, so it is inoperative to their input pin to make an inspection tour pulse, at this moment output diode D6, D10, D14 does not all have positive voltage.M pin owing to IC1 when pulse oscillator F begins to export first pulse is not in the zero setting state all the time, so pulse signal has only elder generation to trigger IC1 and makes its output pin fade to crus secunda by first pin, so all on the output diode of count integration block, have output diode D6 only and positive voltage occurs, when second pulse arrives, the 3rd output pin of IC1 is malleation, malleation makes input pin N get electric and pulse signal annihilation after inciting somebody to action through D3, when the 3rd pulse arrives, because IC2 at this moment zero setting pin M has lost positive electricity so be not in the zero setting state, so when the 3rd pulse is input to input pin N, the IC2 output pin becomes 2 pin by 1 pin, therefore at this moment whole count integration blocks have output diode D10 only malleation, when the 4th pulse arrives, make the 2nd output pin of IC2 become the 3rd output pin again, positive electricity makes its input end for just making its annihilation through D7, when the 5th pulse arrives, because IC3 at this moment zero setting pin M also loses positive electricity and is not in the zero setting state, so the 5th pulse input is also arranged on its input pin N, and make the IC3 output pin become 2 pin by 1 pin, therefore at this moment whole count integration blocks have output diode D14 only malleation, by that analogy, two pulses of every output in the controller, all just there is a unique diode that malleation output is arranged in the receiver, and feed back line by one each measurement signal of making an inspection tour pulse receiver is fed back in the indoor controller, among the figure frame of broken lines right side from top to bottom the second line promptly be to feed back line, D15 among the figure, D16, D17 is an isolating diode, H1, H2, Third Mate's electrode that output line joint 1 and feedback line 3 are formed in the H3 presentation graphs 1 through the conducting of leaking, if the electrode limit that water pipe leaks and appears at certain receiver, then certain pays electrode promptly through the water conducting, but at this moment the output diode of receiver does not take turns to malleation output, even electrode is through the water conducting, feed back and also do not have the malleation appearance on the line, when the output diode of this receiver takes turns to malleation output, feed back on the line positive voltage is promptly arranged, this positive current enters recorder J and contrast electric bridge q, this signal will be recorded in recorder, because recorder is subjected to the time main pulse signal control of sending the device frequently from half, so send a pulse to recorder when partly device is every frequently, recorder just writes down once, and all have just been buried underground when intact at water pipe, owing to do not leak, what sent by certain regional receiver is a resistance value bigger when not leaking so recorder is noted, recorder is just this resistance value record maintenance and as benchmark, when recorder is received from the pulse signal that sends in this zone in regular turn once more, recorder will send former that bigger resistance signal value of noting to the input end of contrast electric bridge q, meanwhile contrast electric bridge q by the identical instant resistance signal value of sending by this zone receiver of pulse sequence number of another input end input, contrast electric bridge q will compare two resistance value signals, if reference resistor value is much higher than instant resistance value, represent that then tested zone leaks, so among the contrast electric bridge q very big output current is arranged promptly, this electric current is during greater than alarm setting value, contrast electric bridge q promptly has signal output, on the input pin of electric signal arrival and door Y, in addition by D2 with the pulse signal electric current of pulse oscillator be input to half frequently behind the device from half frequently the device to switching circuit K output half pulse frequently, (half frequently device BP have the function that frequency is reduced half just have the output diode of a receiver to be in channel status because send two frequencies from F).Simultaneously by error correction switch L, will half pulse frequently be input to another input end with door Y.When not leaking, go out not output of pin like this with door Y, the pulse of D2 output is by switching circuit the time, to trigger tour pulse cycle digital display instrument counts, when leaking, output is arranged with door Y, this output current will make the switching circuit K of control impuls close, so make an inspection tour the pulse cycle digital display instrument count value is rested on this position, we just can find the position that leaks of pipeline according to the numerical value that stops.Simultaneously with door also to alarm B, send alarm signal, light warning light Z.S among the figure is the counting positioning work piece, it is according to the definite numeral that how much decides this number of receiver quantity, as triggering 1000 receivers altogether, then when occurring 1000 on the counter, among the positioning work piece S just to relay P output voltage, make relay P adhesive, the relay contact P1 of control power supply promptly disconnects, feed frame of broken lines from top to down the 3rd, article four, promptly be power line, all receivers just cut off the power supply like this, meanwhile make counter zero setting to making an inspection tour zero setting signal of pulse cycle digital display instrument output by S, then the automatic restoring circuit among the S makes relay P dead electricity again, circuit is connected again, and said mechanism is started working again, pulse is maked an inspection tour played the effect of going round and beginning again.D4, D5, D8, D9, D12, D13 are isolating diode among the figure, and R1, R2, R3 stablize and the earth resistance of usefulness the zero setting end.L among the figure is the error correction configuration switch, when certain detecting head is detected when being wrong signal or the leak source repaired, be on the 100th pulse position as this detecting head, then by operator 100 these numbers are input in the error correction switch, the error correction switch sends an inhibition signal to AND circuit when the 100th pulse occurs, and makes the not output with door Y, switching circuit K is in channel status, counter continues counting, can not pause, and continues down to detect.

Claims (1)

1. non-conductive material water-supply pipeline leak-detection method, it with in the variant zone when water-tight inside and outside between two electrodes high value of resistance and inside and outside two interelectrode low resistance when leaking to detect the resistance that the comparison back produces one by one poor, newspaper as the current measuring instrument device leaks the signal source, it is characterized in that: being embedded in the variant regional tube wall in the underground non-conductive material water-supply pipeline after leaving common metallic conduit one segment distance is provided with many continuous electrodes, utmost point as conduction, outside the tube wall in the variant zone of non-conductive material water-supply pipeline, the many electrodes that can connect one by one are set, as another utmost point of conduction.

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