KR20030003536A - Liquid pipe for detecting water leakage - Google Patents

Abstract

PURPOSE: A liquid pipe is provided to prevent waste of water and maintenance cost by accurately detecting water leakage caused due to the breakage of underground water supply pipe. CONSTITUTION: A liquid pipe for detecting water leakage, comprises a liquid pipe(10) having an inlet and an outlet, and which has a hollow interior for passage of fluid; one or more wires(11) arranged at the liquid pipe so as to detect water leakage between the inlet and outlet of the liquid pipe; and a connector(12) arranged at the front end of the liquid pipe, and which permits electrical connection between wires of the liquid pipe to be easily carried out. The wires are wound along the outer periphery of the liquid pipe or installed between the outer periphery and inner periphery of the liquid pipe.

Description

LIQUID PIPE FOR DETECTING WATER LEAKAGE}

The present invention relates to a liquid pipe for leak detection, and in more detail, one or more conductors are inserted or fixed to be installed, and a pulse tester sends out a pulse signal and inspects a received signal to detect leaks. The present invention relates to a liquid pipe for leak detection that can be used as a water supply pipe.

Currently, about 20% of leaked water is leaked because the old water pipe is not replaced. This not only wastes money, but also implies the possibility of water pollution from inhalation of foreign matter or bacteria from the leak location. Therefore, it is necessary to know the leak location and replace the old water pipe. However, in the case of the conventional leak detection technology, there is a difficulty in detecting a small amount of water leak, and there is a problem that the leak position cannot be accurately identified.

Referring to the conventional leak detection method is as follows.

First, there is a way to detect green food from the ground. In this case, use tools such as listening sticks or the hearing of a trained professional. In addition, when sound generated by a leak is transmitted to the surface, the sound may be detected and amplified on the surface, and then listened to the receiver or analyzed by a meter to detect the leak.

However, since it depends on the hearing rod or the hearing of a person, it can be detected only when a certain amount of leakage occurs. In addition, the water supply line is to be buried at a depth of 1.2 meters or less above the ground, so it is difficult to detect leaks in small amounts and it is difficult to accurately detect the leak point. In addition, in the case of a water supply pipe installed under a traffic road that is not a dedicated site, it is almost impossible to detect the traffic noise due to traffic.

Second, there is a method of installing a moisture detection sensor on the outside of the pipe to detect water leaked to the outside when the leak occurs.

The method of using sound waves or using a moisture sensor is a pipe-attached method, and when a leak occurs, it can be immediately known through an alarm signal, which can be used as a concept such as online monitoring.

However, since the soil itself contains moisture, it is not easy to install a moisture sensor outside the pipe.

Third, there is an isolated method that uses a bypass line to isolate the pipeline from the network and then perform the inspection.

This method isolates the line and closes one end of the pipe line and pushes the sphere slightly larger in diameter than the inner diameter of the tube by hydraulic pressure. Use a phenomenon that does not progress. That is, if the sphere pushed by the hydraulic pressure no longer proceeds, it means that there is a leaking site at that position.

However, when there are two or more leaking parts that are far from each other, it is difficult to detect the location of the leaking part located in the middle, and it is almost impossible to detect very fine through cracks such as stress corrosion cracking or it takes a long time.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid pipe for leak detection.

In order to achieve the above object, the leak detection liquid pipe according to the present invention, the liquid pipe having an inlet and an outlet and the liquid flows into the hollow inner space; And at least one conductive line provided in the liquid pipe to detect a leak between the inlet and the outlet.

Preferably, the conducting wire is installed between the outer circumferential surface of the liquid pipe or between the outer circumferential surface and the inner surface of the liquid pipe, and is provided at a predetermined distance from the inlet or outlet, and has a hole into which the wire can be inserted, Since it is provided in the form of a male screw so that it can be fixed, it is characterized by further comprising a connecting portion for facilitating the electrical connection between the conductors of the adjacent liquid pipe.

More preferably, it further comprises a protective cap for protecting by covering the upper portion of the connection.

Advantages, features and preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a leak detection liquid pipe according to the present invention.

2 is a cross-sectional view of the leak detection liquid pipe according to the present invention.

Figure 3 is an exemplary embodiment of leak detection using a liquid pipe for leak detection according to the present invention.

*** Explanation of symbols on the main parts of the drawing ***

10: liquid tube 11: conductor

12: connection 13: protective cap

14: inserting part 20: pulse tester

30: Receiver

1 is a perspective view of a leak detection liquid pipe according to the present invention. As shown in FIG. 1, the leak detection liquid tube according to the present invention fixes one or more conductors 11 to the outside or inserts the inside thereof. Preferably, the conductive wire 11 is formed by winding in a spiral shape. In addition, in order to facilitate the interconnection of the liquid pipes 10, the distal end portions of both liquid pipes 10 are provided with a connecting portion 12 for easily connecting such conductors. FIG. 1 shows a liquid tube 10 having two leads 11, each having an inlet and an outlet.

Figure 1 (a) is a view showing a state before the two liquid pipes 10 according to the present invention is coupled, Figure 1 (b) shows a state in which two liquid pipes 10 according to the present invention are combined. Figure shown.

The liquid pipe 10 according to the present invention is a pipe through which liquid flows into the inner space, and may be used as a water supply pipe or a sewer pipe.

As shown in Figs. 1A and 1B, the liquid pipe 10 has an insertion portion 14 to which another liquid pipe 10 is inserted and fixed to one side for connection. do. That is, in the case of FIGS. 1A and 1B, the right part of the right liquid pipe 10 is provided with an insertion part 14 so that the left part of the left liquid pipe 10 is inserted and fixed. do. In addition, it is possible to attach a waterproof dedicated connector (not shown) that can prevent leakage to the connection portion between the liquid pipe (10).

When the liquid pipe 10 according to the present invention is used as a water pipe, it is possible to use a water pipe that is currently generally used. That is, steel pipes, cast iron pipes, PE (Poly Ethylen) pipes, Hi-3P impact water pipes, stainless steel pipes and PE steel pipes. Each tube is easily understood by those of ordinary skill in the art, and a detailed description thereof will be omitted.

The conducting wire 11 which concerns on this invention uses a very thin conducting wire, Preferably it coats with a non-conductor and is used. Therefore, when the damage occurs in the liquid pipe 10, the wire 11 is broken by hydraulic pressure, and when the water leaks in the liquid pipe 10, the wire 11 is submerged. In addition, the material of the conductive wire 11 is determined according to the material of the liquid pipe (10). Generally, copper wire is used, but when the liquid pipe 10 is a cast iron pipe, the liquid pipe 10 itself is well passed through electricity, so it is used by using a nichrome wire or by coating with a non-conductor.

The conductive wire 11 according to the present invention is fixed to the outside or the inside of the liquid pipe 10, which is determined according to the material of the liquid pipe 10.

For example, in the case of using a pipe made of casting at a low temperature, such as PE pipe, as the liquid pipe 10, the liquid pipe 10 is formed by casting in the state in which the conductor 11 is inserted. In addition, when the connection between the liquid pipe 10 should also be connected to the conductive wire 11 of both liquid pipe 10, both ends of the conductive wire 11 is formed to protrude to the outside of the liquid pipe 10 by a predetermined length.

In addition, when the casting is made at a high temperature, such as cast iron pipe to the liquid pipe 10, when the casting is made in the state that the wire 11 is inserted, the wire 11 is melted, so that the wire 11 is outside the liquid pipe 10 Coil and fix with tar or PE.

In addition, the fixing of the conductive wire 11 is preferably made helical. In this case, an appropriate distance is maintained between the conductive wires 11. That is, the conductive wire 11 is wound at intervals that can cover a large area of the liquid pipe 10 without affecting crosstalk or the like.

In addition, one or more conductive wires 11 according to the present invention are provided. Preferably, two conductive wires 11 are provided for efficient breakage detection of the liquid pipe 10.

The connection part 12 according to the present invention is formed in a shape protruding like a male screw, and is provided to connect the conductive lines 11 of the liquid pipes 10 when the liquid pipes 10 are connected. That is, as shown in Fig. 1A, the conductive wire 11 is inserted into the hole of the connecting portion 12 and wound around the connecting portion 12. And between the conducting wires 11 of both liquid pipes 10 is connected. In addition, the protective cap 13 may be put on the upper end of the connection part 12 to fix the conductive wire 11 more firmly. Preferably, the connecting portion 12 and the protective cap 13 is formed in a cylindrical shape, and the outer surface of the connecting portion 12 and the inner surface of the protective cap 13 are provided with irregularities.

The connection part 12 is provided in the both ends of the liquid pipe 10 by the number of conducting wires 11, respectively.

2 is a cross-sectional view of the leak detection liquid pipe according to the present invention. FIG. 2 (a) is a view showing the conducting wire 11 on the outside of the liquid pipe 10, and FIG. 2 (b) shows the conducting wire 11 on the inside of the liquid pipe 10. As shown in FIG. It is a degree. That is, FIG. 2 (a) is a spiral of fixing the conductive wire 11 to the outside of the liquid tube 10, Figure 2 (b) is a spiral insert of the conductive wire 11 in the manufacture of the liquid tube 10. .

As described above, the conductive wire 11 according to the present invention is provided outside or inside the liquid pipe 10 according to the material of the liquid pipe 10.

Since the liquid pipe 10 is generally manufactured by casting, the temperature at the time of casting depends on the material. Therefore, when the material manufactured at high temperature is used, since the conducting wire 11 melts, the conducting wire 11 cannot be provided in the inside of the liquid pipe 10.

When using the tube manufactured at high temperature like a cast iron tube as the liquid tube 10, the conducting wire 11 is provided in the outer side of the liquid tube 10 like FIG. In this case, the conducting wire 11 is located outside the liquid pipe 10 and fixed with tar or PE. Preferably, the wire is spirally wound and fixed to the outside of the liquid pipe 10.

In the case of using a tube manufactured at a relatively low temperature such as a PE tube as the liquid tube 10, since the conductive wire 11 does not melt when the liquid tube 10 is manufactured, as shown in FIG. 10) provided inside. In this case, the liquid pipe 10 is manufactured in the state which the conducting wire 11 was located in the casting frame. Preferably, the conductive wire 11 is formed in a spiral form.

Figure 3 is an exemplary view of leak detection using a liquid pipe for leak detection according to the present invention. As shown in FIG. 3, the leak detection using the leak detection liquid tube according to the present invention is performed by sending a pulse signal to the conductive wire 11 using the pulse tester 20.

FIG. 3A is a diagram showing an embodiment having a pulse tester 20 and a receiver 30, and FIG. 3B is a diagram showing an embodiment having only a pulse tester 20. As shown in FIG. That is, in the case of FIG. 3A, the pulse signal transmitted from the pulse tester 20 is received through the receiver 30, and in the case of FIG. 3B, the pulse signal transmitted from the pulse tester 20 is a conducting wire. The pulse tester 20 receives the reflected pulse reflected at the end of.

The pulse tester 20 is a mechanism for measuring the unevenness of the cable impedance, disconnection, short-circuit and failure of the cable, the distance of the failure point of the cable, and the like. A pulse tester is a mechanism which sends a pulse signal to a fault core wire, receives the reflection pulse from a fault point, and measures a fault position by the time. The fault location is calculated by equation (1).

l is the distance to the failure point, v is the propagation speed of the pulse signal, and t is the reception time of the reflected pulse.

Pulse signals used in the pulse tester include square waves, sawtooth waves or sinusoidal square waves, and can be selected according to the type of tester. Preferably, a sine square wave having the least harmonic content is used. In addition, the maximum measuring distance of the pulse tester is 12.5 km, that is, about 25 km in a round trip. Therefore, in the case of leak detection according to the present invention, when the wire is formed in a spiral, it can be inspected every 6 to 7 km of liquid pipe. Since the propagation speed of the pulse signal is 290 (m / kV), the repetition period T is calculated as shown in equation (2).

In addition, the repetition frequency fr is shown in Equation 3.

However, the repetition frequency of the pulse tester is 5 [kHz], which is less than 11.6 [kHz], so the condition is satisfied.

In addition, the pulse tester can determine the state of the cable according to the waveform of the reflected pulse. That is, it is possible to grasp disconnection (opening), crosstalk (shorting), immersion and crosstalk.

Therefore, in the case of leak detection using the liquid pipe according to the present invention as a water pipe, it is possible to grasp the fault state by the waveform of the reflected pulse and measure the fault position by the reception time. That is, in the case of disconnection (opening), it is determined that the corresponding position of the liquid pipe is completely broken, and in the case of crosstalk (shorting), it is determined as construction failure. Also, in case of flooding, it is determined that there is a leak at the corresponding position.

In addition, the pulse tester 20 continuously transmits a pulse signal, receives and inspects a reflected wave, and transmits a result value to a central center that manages the entire water supply facility through the Internet or a wired or wireless communication network. The central center remotely reads meter readings from each pulse tester to determine and display the status of the entire water supply network.

3A receives the pulse signal transmitted from the pulse tester 20 through the receiver 30. In the case of FIG. 3A, when the liquid pipe 10 is completely broken and the conductive wire 11 is opened, the pulse signal is reflected at the open position and the reflected pulse is received by the pulse tester 20. That is, when the pulse signal is not received by the receiver 30, it may be determined that the conducting wire 11 is opened, that is, the liquid pipe 20 is completely damaged. In addition, the broken time can be identified through the reception time of the reflected pulse.

In addition, when not completely damaged, since the pulse signal is received by the receiver 30, the state of the liquid pipe 10 can be grasped according to the waveform of the received pulse signal.

3 (b) shows that the pulse signal transmitted from the pulse tester 20 is reflected because the end of the conductive wire is grounded, and the pulse tester 20 receives the reflected pulse. Therefore, the state of the liquid pipe 10 can be grasped through the waveform of the reflected pulse, and in case of a failure, the failure location can be calculated through the reception time.

As described above, the present invention has a remarkable effect of detecting whether the pipe is leaked due to breakage or damage, and accurately calculating the position of breakage or damage.

In addition, when the liquid pipe according to the present invention is used as a water pipe, it is possible to accurately know whether or not the location of the water leak due to the breakage or damage of the water pipe buried underground, so as to prevent the waste of water resources and to repair and repair Can save manpower.

In other words, by quickly identifying and responding to the failure of the water supply pipe, it is possible to prevent waste of water resources due to leakage, and by accurately identifying the location of the water supply pipe where the failure occurs, the cost and manpower for replacement and repair can be greatly reduced. have.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

Claims (10)

A liquid tube having an inlet and an outlet and allowing liquid to flow into the hollow interior space; And Leak detection liquid pipe characterized in that it comprises one or more conductors provided in the liquid pipe, in order to detect a leak between the inlet and the outlet. The method of claim 1, Leak detection liquid pipe, characterized in that the conductive wire is provided between the outer circumferential surface or the outer circumferential surface of the liquid pipe and the inner surface of the liquid pipe. The method of claim 1, Leak detection liquid pipe, characterized in that the conductive wire is provided in a spiral. The method of claim 1, The liquid pipe, a liquid pipe for leak detection, characterized in that using one selected from steel pipe, cast iron pipe, PE pipe, Hi-3P impact water pipe, stainless steel pipe and PE steel pipe. The method of claim 1, Leak detection liquid pipe, characterized in that the conductive wire is coated with a non-conductor. The method of claim 1, Leak detection liquid tube, characterized in that the two wires. The method of claim 1, Leak detection liquid pipe, characterized in that the conductive wire is a copper wire. The method of claim 1, And a connection part provided at a predetermined distance from the inlet port or the outlet port to facilitate electrical connection between conductors of a neighboring liquid pipe. The method of claim 8, wherein the connection portion, The liquid pipe for leak detection, characterized in that it has a hole into which the wire can be inserted, and is provided in the form of a male screw so that the wire can be wound and fixed. The method of claim 8, The water supply pipe for leak detection, characterized in that it further comprises a protective cap for protecting by covering the upper portion of the connection.