CN102182931A

CN102182931A - Temperature differential type pipe water leakage detection method

Info

Publication number: CN102182931A
Application number: CN2010101997620A
Authority: CN
Inventors: 陈宜中; 傅雅芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-29
Filing date: 2010-05-29
Publication date: 2011-09-14

Abstract

The invention relates to a temperature differential type pipe water leakage detection method. A heating device is fixed on the exterior surface of a starting pipe section of a tested water pipe and is electrically connected with a time-base circuit, a thermometer A and a thermometer B are arranged in different positions on the exterior surface of the pipe section in certain distance away from the heating device, and the thermometer A and the thermometer B are electrically connected with a leakage reporting circuit. The temperature differential type pipe water leakage detection method is characterized in that the leakage reporting circuit acquires an electric signal whether water leakage happens or not through a temperature difference value measured by the thermometer A and the thermometer B. The detection method for water leakage at a tail end water supply pipe network with water stopping time, disclosed by the invention, is simple and feasible.

Description

The thermal type water pipe detection method of leaking

Technical field

The invention belongs to the pipeline leak detection field, a kind of specifically water supply line detecting method, especially thermal type water pipe detecting method of leaking of leaking.

Background technique

The groundwater supply pipeline through regular meeting because pipeline is aging or land subsidence causes pipeline jackknifing and leak, whether the terminal pipe network of water supply line is except having underground the leaking by the manual metering analysis at present, know the under ground piping normal following several method that adopts that leaks: 1, the water leakage alarm sensing water meter is installed, by the water flow variation generation (patent No. 200320123994.3) that judged whether to leak; 2, go into the hydrodynamic(al) device in that water pipe is built-in, reply position judge whether to leak (patent No. 00131925.6) according to the hydrodynamic(al) device; 3,, in pipe, insert electrode, the resistance variable of the earth resistance by testing electrode, the generation that judged whether to leak (patent No. 200710127672.9) for nonmetal water pipe.Have or not the generation of leaking though these methods can both effectively detect the groundwater supply pipeline, adopt these methods to detect to leak to cut off the water and unload pipe, embedded device could be implemented on pipeline or in the pipeline then, so some user do not want to take the trouble, and is reluctant installation.Terminal pipe network waters such as enterprises and institutions, residential quarter or certain building building generally have two kinds of situations at present: a kind of situation is 24 hours continuous waters of needs of user, these users are generally based on extraordinary enterprise and hospital, another kind of situation is an intermittently water of user, water idle hours was promptly arranged in 24 hours, these users are in the great majority, only, have or not the method for leaking that bigger social effect is also arranged if can invent out a kind of simple detection under ground piping at these users.

Summary of the invention

The objective of the invention is: release a kind of simple at the terminal water supply network that water idle hours the is arranged detecting method of leaking.

The object of the present invention is achieved like this: it comprises that is fixed on the apparent and electric heating equipment that joins of time base circuit by standpipe initial pipe section, thermoscope A and thermoscope B are set on the diverse location of the pipeline section appearance of leaving the heating equipment certain distance, thermoscope A and thermoscope B are electrically connected with the newspaper drain circuit, and it is characterized in that: described newspaper drain circuit obtains by thermoscope A and the measured temperature gap of thermoscope B and has or not the electric signal that leaks.

Like this, when being fixed on terminal pipe network The initial segment (as a tame enterprise, the water supply network of enterprises promptly is so-called terminal pipe network, the position promptly is terminal pipe network The initial segment near the water meter of water inlet manifold) when the interior time base circuit set time of package unit arrives (generally being set in the late into the night), heating equipment begins being heated by standpipe initial pipe section appearance, after heating a bit of time, if it is anhydrous mobile in the pipeline at this moment, it is higher to be arranged on the apparent temperature value that records from the near thermoscope A of heating equipment of pipeline section so, the temperature value measured from heating equipment thermoscope B far away is lower, the difference of these two temperature makes the newspaper drain circuit obtain not having the electric signal that leaks, the newspaper drain circuit is not reported to the police, and detects and finishes; And when heating equipment when being heated by standpipe initial pipe section appearance, if there is water to flow in the pipeline, then the water cooling that should flow heated pipeline section, when heating finishes so, the thermoscope A and the measured temperature of thermoscope B that are arranged on the pipeline section appearance diverse location do not have difference substantially, this Times drain circuit obtains and stores one that the electric signal that leaks is arranged, rest after a period of time treats pipeline section cooling, time base circuit makes heating equipment to being heated once more by standpipe initial pipe section appearance again, if thermoscope A and the measured temperature of thermoscope B still do not have difference substantially when heating finishes, this Times drain circuit is got back and stored one the electric signal that leaks, so repeat repeatedly, if each thermoscope A and the measured temperature of thermoscope B all do not have difference substantially, then to be stored when having the electric signal that leaks to reach certain numerical value, the newspaper drain circuit sends the alarm of leaking, and detects end; Repeating to heat in the testing process, as long as the temperature height that records than thermoscope B of the temperature that records of thermoscope A once, represent that then water does not flow (as long as terminal pipe network has the short time current to rest in this time period water pipe, promptly can descend pipeline not have to leak generation for certain), then report the signal that leaks that obtains before the drain circuit by zero setting, the water leakage alarm circuit is not reported to the police, and detects and finishes.

Description of drawings

Fig. 1 is that heating equipment and thermoscope are provided with schematic representation on pipeline section.

Fig. 2 is the leak circuit theory diagrams of detection method of thermal type water pipe.

Embodiment

Fig. 1 is that heating equipment and thermoscope are provided with schematic representation on pipeline section, among the figure 1 is electric box, the 2nd, circuit board, the 3rd, the heating equipment connecting line, the 4th, heating equipment, the 5th, thermoscope A connecting line, the 6th, thermoscope B connecting line, the 7th, thermoscope A, the 8th, by standpipe initial pipe section, the 9th, thermoscope B, arrow is represented water (flow) direction among the figure, and heating equipment 4 is fitted in by on the outer surface of standpipe initial pipe section 8, and heating equipment 4 joins by heating equipment connecting line 3 and circuit board 2, the current downstream position that leaves heating equipment 4 a bit of distances is provided with the thermoscope A that represents with sequence number 7, the current downstream position that leaves a bit of distance of thermoscope A is provided with the thermoscope B that represents with sequence number 9, and thermoscope A joins by thermoscope A connecting line 5 and circuit board 2, and thermoscope B joins by thermoscope B connecting line 6 and circuit board 2, circuit board 2 places electric box 1, and electric box 1 is placed on by the periphery of standpipe initial pipe section 8.

When if the water pipe caliber is very little, above-mentioned heating equipment also can be positioned over the water pipe lower external face under the thermoscope A, its principle is basic identical, for preventing that heat runs off, also can be at heating equipment and thermoscope installation position parcel thermal insulation layer, because heating is intermittent type and certain period at night regularly, so the consumption electric weight is less.

Fig. 2 is the leak circuit theory diagrams of detection method of thermal type water pipe.The temperature detecting resistance of thermoscope A in the RA presentation graphs 1 among the figure, the temperature detecting resistance of thermoscope B in the RB presentation graphs 1, R1, R2, R3, R4 is a fixed resistance, and R1 is identical with the R2 resistance, and E is a bridge power supply, Fd is an amplifier, F represents reverser, and Y represents and door that S is a time base circuit, P is the relay that is subjected to time base circuit S control, heating equipment in the JL presentation graphs 1, K are the contacts of relay P, and EJ is the heating equipment power supply, C1, C2 is an electric capacity, D1, D2 is a diode, the 4017th, and the ring counter integrated package, the yo in 4017 represents the zero setting pin, yc represents to trigger pin, and ys represents the output pin of reporting to the police.RA among the figure, RB, R1, R2 forms an electric bridge, the time that basic at that time circuit S sets is when arriving, relay P work, relay contact K becomes conducting by often opening, heating equipment JL gets, be that heating equipment 4 among Fig. 1 begins being heated by the appearance of standpipe initial pipe section 8, behind the heating certain hour, time base circuit S makes relay P disconnect, this heats end, if this moment, thermoscope A and two temperature recording of thermoscope B among Fig. 1 did not have difference (having water to flow in the pipeline section) substantially, their temperature detecting resistance RA then, the value of RB is also basic identical, electric bridge is in state of equilibrium, electric bridge does not have signal and exports to amplifier Fd, Fd goes out pin for negative, that is the pin that advances of reverser F is negative, so reverser F goes out pin for just, an input pin with door Y is in positive status like this, simultaneously time base circuit S gives another input pin with door Y by positive signal of capacitor C 1 output when heating finishes, this moment, the output pin with door Y just was, this positive signal triggers ring counter 4017 by capacitor C 2, makes 4017 accumulations, one number, and a heating sense cycle finishes; The certain hour that rests (is generally about ten minutes and heats once.) after, time base circuit makes the 4 pairs of appearances by standpipe initial pipe section 8 of heating equipment among Fig. 1 carry out the heating second time again, when heating end for the second time, if two temperature that thermoscope A among Fig. 1 and thermoscope B record still do not have difference (still having water to flow in the pipeline section) substantially, with aforementioned identical, 4017 accumulate a number again, so repeating heating detects repeatedly, if there is water to flow in the pipeline section always, treat that 4017 are accumulated to when setting number, ys output water leakage alarm signal; In whole heating testing process, as long as once two temperature gaps that thermoscope A among Fig. 1 and thermoscope B record when heating finishes are big (anhydrous flowing in the pipeline section), at this moment RA, RB have difference, the electric bridge disequilibrium, electric bridge is promptly exported to amplifier Fd, signal passes through the zero setting pin of diode D1 input 4017 after Fd amplifies, make 4017 zero setting, ys promptly can not export the water leakage alarm signal, the signal of Fd output simultaneously inputs to time base circuit S by diode D2, time base circuit cuts out, finish entire work process.R3, R4 are the very big discharge resistances of resistance.

Components and parts among the present principles figure (except heating equipment and power supply) all are installed on the circuit board 2 among Fig. 1, the required power supply of heating equipment and circuit can use charging battery jar, also can the applied solar energy battery, power supply can be placed in the electric box among Fig. 1, also may be placed on outside the electric box, (hypothesis is placed in the electric box among Fig. 1, because of being covered by box, so do not represent.) alarm signal can use beacon, sounder or emission radio alarming signal mode, these all can be placed in the electric box.

Claims

1. the thermal type water pipe detection method of leaking, it comprises that is fixed on the apparent and electric heating equipment that joins of time base circuit by standpipe initial pipe section, thermoscope A and thermoscope B are set on the diverse location of the pipeline section appearance of leaving the heating equipment certain distance, thermoscope A and thermoscope B are electrically connected with the newspaper drain circuit, and it is characterized in that: described newspaper drain circuit obtains by thermoscope A and the measured temperature approach of thermoscope B and has or not the electric signal that leaks.