KR100327167B1 - System for constructing and managing double insulating pipe and water leakage sensing device - Google Patents

Abstract

PURPOSE: A system for constructing and managing a double insulating pipe and a water leakage sensing device are provided to solve the problems occurring in the construction and operation of a double insulating pipe in an early stage. CONSTITUTION: A current drive circuit(30) is connected to a sensor wire of a double insulating pipe. A first negative feedback amplifier(32) detects a loop resistance. A second negative feedback amplifier(34) detects a water leakage resistance. A buffer(36) temporarily stores measurement data for the measurement of a water leakage point. A multiplexer(38) selects the signals from the buffer. An analog-to-digital converter(40) converts the analog signal from the multiplexer to a digital signal. A microcomputer(42) controls the system. An IC chip(44) is interfaced to monitor the state of a computer.

Description

Double insulated pipe construction and management system and its leak detection device

The present invention relates to a double insulated pipe construction and management system, and more particularly, to a double insulated pipe construction and management system for early detection and repair of an anomaly occurring during construction and operation of a double insulated pipe, and To a leak detection device.

Generally, when a liquid flowing through a pipe line such as a water pipe or a pipeline that is visually intercepted by being buried in an underground or a wall of a facility leaks from a pipe due to a defect or breakage of the pipe, it is difficult to accurately locate the leak point have. Failure to detect these anomalies in the buried pipeline early and correctly and repair them quickly may cause economic and environmental pollution. To solve this problem, a pipeline management system has been actively developed to detect the leaking state of the buried pipeline and the leaking point at an early stage.

However, in the construction and maintenance of pipelines for transferring fluids, especially in double insulation pipes, water leakage from a steel pipe or a plastic pipe outside a double insulation pipe is caused by leakage of internal heat Not only cause a heat loss due to the corrosion of the cast iron tube, but also rapidly corrode the cast iron tube, and at the same time, the appearance is expanded by the heat transferred to the outer surface surrounding the cast iron tube, and the connection portion of the tube is secondarily destroyed. The progression of this phenomenon spreads horizontally in the underground where the pipe is buried, causing large damage to the pipe connection area in addition to the heat loss of the pipe.

In the construction of the double insulated pipe, the construction and burial were carried out without any problem at the time of construction, but double insulated pipe itself which was not noticed during construction, double insulated pipe due to pipe abnormality due to defects such as valves, In case of pipe damage, it is extremely difficult to identify the location of defects if the repair is completed after the completion of the construction work without repairing immediately. In addition, in the initial construction, the construction amount of the double insulated pipe is small, so it can be inspected several times a day. However, as the amount of construction increases, the number of inspections decreases. Therefore, even if abnormalities occur in the double insulation pipe, As a result of the accumulation of such abnormal parts that can be found, there is a greater difficulty in repairing at the time of completion.

In this way, the most important thing in the construction of the double insulated pipe is precise construction, but even if the correct construction is performed, the abnormality due to leakage, short-circuit, short-circuit or other cause is not detected Betting is extremely difficult now.

However, the conventional pipeline management system is not effective in construction and management of the double insulated pipe as described above, and there are many inconveniences in operation of the system. Also, the conventional pipe management system can not be applied to wet detection in laboratories and warehouses that can be used for leakage detection of water pipes, oil pipelines, and the like and must be kept dry.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an apparatus and method for quickly and accurately detecting an anomaly such as a leak, a short circuit, And to provide a construction and management system for a double insulated pipe.

Another object of the present invention is to provide a double insulated pipe construction and management system that can be used as a construction system at the time of construction of a double insulated pipe which was not possible with a conventional pipe management system, will be.

It is still another object of the present invention to provide a multi-purpose management system for pipes for detecting wetness in a laboratory, warehouse, and the like and for detecting leakage of sewage or oil pipes, which must be maintained in a dry state.

Another object of the present invention is to provide a pipe construction and management system of an improved structure which is not only easy to use by a user but also can detect an abnormal phenomenon more accurately and quickly.

It is another object of the present invention to provide an improved structure of leak detection device that can be used in the construction and management system of the double insulated tube and in the multipurpose management system of the pipe.

In order to accomplish the above objects, the present invention provides a leakage inspecting apparatus for a double insulated pipe installation system, comprising: a current driving means of a reference voltage source connected to a sensor wire in a double insulated tube for monitoring a state of a double insulated pipe; First auxiliary feedback amplifying means connected to the current driving means for detecting the loop resistance at the time of leak detection; Second auxiliary feedback amplifying means connected to the current driving means for detecting leakage resistance at the time of leak detection; A buffer means connected to a cast iron pipe in a double insulated pipe for temporarily storing measurement data for measuring a leak point in leakage detection; A microcomputer having a built-in RAM for controlling the entire construction system, detecting leakage of water and detecting leakage positions from the output signals of the first and second auxiliary feedback amplifying means and buffer means, ; A multiplexer for selecting signals from the first and second sub feedback amplifiers and the buffer means and transmitting the signals to the microcomputer; and a control unit connected to the microcomputer, Display means for displaying data of the display device; A push switch connected to the microcomputer for transmitting an external input from the user to the microcomputer; A portable computer for recording data of the construction system; And a communication and alarm unit connected to the microcomputer and the portable computer for exchanging data with the portable computer and for displaying when an abnormal phenomenon occurs.

The double insulated tube is filled with a cast iron tube, a plastic tube which surrounds the cast iron tube from outside, a cast iron tube and a plastic tube, and a sensor wire and a paddle which have a constant resistance and have grooves at certain intervals in the coating, It consists of insulation with built-in return wire.

The leakage detection device of the double insulated tube management system according to the present invention comprises a current driving means of a reference voltage source connected to a sensor wire in a double insulated tube for monitoring the state of the double insulated tube; A first feedback amplifier means wave connected to the current driving means for detecting the loop resistance at the time of leakage detection; Second auxiliary feedback amplifying means connected to the current driving means for detecting leakage resistance at the time of leak detection; Buffer means connected to a cast iron pipe in a double insulated pipe for temporarily storing measurement data for measuring a leakage point at the time of leakage detection; and a control means for controlling the entire double insulated pipe management system and controlling the first and second auxiliary feedback amplifying means and A microcomputer having a RAM for detecting leakages and leakage positions from an output signal of the buffer means and storing data obtained when a leak is detected; A multiplexer for selecting signals from the first and second sub feedback amplifiers and the buffer means and transmitting them to the microcomputer; Display means connected to the microcomputer for displaying a predetermined amount of data stored in the RAM so that the system user can check whether the double insulated tube is abnormal; A push switch connected to the microcomputer for transmitting an external input from the user to the microcomputer; Communication means for communicating with the microcomputer, the communication means being connected to the microcomputer; And a soft start power source connected to the communication means for preventing inrush current and initial stabilization of the power supply device. The sensing cable has a sensor wire having a certain resistance value and a groove formed at a predetermined interval in the cover, A return wire covered with an insulator, a lead wire covered with a water-insulated insulator and a circumferential insulator enclosing the sensor wire, a wire and a lead wire, and a strand wrapping around the circumferential insulator shell And a shield.

A wetting and leakage detection system of a double insulated tube according to the present invention comprises: current driving means of a reference voltage source connected to a sensor wire in a sensing cable for monitoring a state of a sensing cable; First negative feedback amplifying means connected to the current driving means for detecting the loaf resistance at the time of wetting and leakage detection; Second negative feedback amplifying means connected to the current driving means for detecting wetting and leakage resistance during wetting and leakage detection; Buffer means for temporarily storing measurement data for measuring wetting and leaking points at the time of wetting and detection of leakage; Wetting and leakage detection systems, detecting wetting and leakage detection and wetting and leakage positions from the output signals of the first and second auxiliary feedback amplifying means and buffer means, storing the obtained data in wetting and leakage detection A microcomputer having a built-in RAM; And a display means connected to the microcomputer for displaying a predetermined amount of data stored in the RAM so that the system user can check whether the double insulated pipe is abnormal. The double insulated pipe includes a cast iron pipe, a plastic pipe surrounding the cast iron pipe, A sensor wire which is filled between the cast iron pipe and the plastic pipe and has a constant resistance value and has grooves at regular intervals in the cloth, and a heat insulating material having a return wire embedded with a complete insulator covering the paddle wire.

The management system of the double insulated tube according to the present invention comprises a current driving means of a reference voltage source connected to a sensor wire in a double insulated tube for monitoring the state of the double insulated tube and a current detecting means connected to the current driving means for detecting A second auxiliary feedback amplifying means connected to the current driving means for detecting the leakage resistance at the time of leakage detection, and a second auxiliary feedback amplifying means connected to the cast iron pipe in the double insulation pipe for measuring the leakage point A microcomputer connected to the microcomputer and connected to the microcomputer so that the system user can check whether the double insulated tube is abnormal or not, A display unit for displaying data of the display unit; A push switch for transmitting an external input to a microcomputer, and a push-pull amplifier for reinforcing a communication output, the communication device being connected to the microcomputer and performing communication with the microcomputer, A leakage detection device having a soft start power source for preventing current and for initial stabilization of the power supply; A power supply for supplying power to the leak detection device; A central monitoring device for performing data exchange with the leak detection device and managing the data; And a signal compensator for amplifying a signal communicated between the water leakage sensing device and the central monitoring device.

These and other objects and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention.

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

(A) is a cross-sectional view of a double insulated tube, (B) is a longitudinal sectional view of the double insulated tube, and (C) is a double-sided insulated tube according to the first embodiment of the present invention. It shows the shape of sensor wire and return wire built in pipe. As shown in FIG. 1, the double insulated pipe includes a cast iron pipe 14, a plastic pipe 16 outside the cast iron pipe 14, and a heat insulating material 18 filled between the cast iron pipe 14 and the plastic pipe 16. . Here, a so-called PUR foam is generally used as the heat insulating material 18. [ A sensor wire (10) and a return wire (12) are embedded in the heat insulating material. The sensor wire 10 has a constant resistance value and has a structure in which a groove is formed in the coating of the wire, while the return wire 12 has a structure in which the wire of the wire is covered with a coating of a complete insulator.

FIG. 2 (A) is a view illustrating a structure of a sensing cable to which the present invention is applied, which is used for detecting a leak of a wetting detection, a water pipe, an oil pipeline, etc. in a laboratory, a warehouse, (B) shows the shape of the sensor wire and the return wire embedded in the cable. As shown in FIG. 2, the sensing cable is formed by filling three conductive wires, the sensor wire 20, the return wire 22 and the conductive wire 24, with a moisture absorbing insulator 28, And has a structure in which a columnar insulator shell is surrounded by a twisted wire shield 26 and has a constant length. The sensor wire 20 has a constant resistance and has grooves at regular intervals on the wire, while the return wire 22 has a structure in which the wire of the wire is covered with a complete insulator. The lead wire 24 is covered with a stranded paddle by a water-absorbing insulator 28, for example, a cotton covering material.

FIG. 3 is a block diagram showing the configuration of a leakage detection device used in a construction system for a double insulated tube according to the present invention. Referring to FIG. 3, the leakage sensing device includes a current drive circuit (not shown) of a reference voltage source Vref connected to the sensor wire 10 of the double insulated tube for sensing the state of the double insulated pipe shown in FIG. 30, a first sub feedback amplifier 32 provided for detecting a loop resistance, a second sub feedback amplifier 34 provided for detecting leakage resistance, and measurement data for measuring a leakage point A multiplexer 38 for selecting signals from the first and second sub-feedback amplifiers 32 and 34 and the buffer 36, and an analog output signal from the multiplexer 38, And an analog-to-digital converter (A / B) 40 for conversion into a signal. In addition, the leakage sensing apparatus includes a microcomputer 42 having a RAM for controlling the entire system and storing a predetermined amount of data, an IC 42 for controlling operations of the switches, A switch 44 for driving the switches, a push switch 50 for external input from the user, a portable computer 54 for data of the construction system, A communication and alarm unit 52 for data exchange with the power supply 54 and a display at the time of occurrence of an anomaly, and a battery 56 for supplying power to the system.

3, the current drive circuit 30 includes resistors R1 and R2 respectively connected to the reference voltage source Vref and the first and second sub-feedback amplifiers 32 and 34, And SW5 connected in parallel to R1 and R2, respectively. Since the length of the double insulated pipe is relatively short during the construction of the double insulated tube, the current from the reference voltage source Vref flows a lot in the measurement of the leak point because the resistance value of the sensor wire 10 is relatively small. This phenomenon is supposed to compensate for the phenomenon that the voltage is lowered. And a negative feedback method is adopted for measuring the loop resistance value. The switch SW1 is connected to one end A of the sensor wire 10 and the input end of the first sub feedback amplifier AMP1 32 and the switch SW2 is connected to one end B of the return wire 12 and the first sub feedback amplifier AMP2 The switch SW3 is connected to one end A of the sensor wire 10 and the input end of the second sub feedback amplifier AMP2 34 and the switch SW4 is connected to one end B of the pipe and the second sub feedback amplifier AMP2 (34). The switch SW5 is connected between the reference voltage source Vref and one end A of the sensor wire 10 and the switch SW6 is connected between one end B of the return wire 12 and the ground potential.

3, the leakage sensing device according to the present invention continuously senses the state of the double insulated pipe using the battery 56 and transmits data obtained at the time of sensing to the microcomputer 42. [ And stores it in the RAM built in. Accordingly, the system administrator operates the push switch 50 connected to the microcomputer 42 to display a certain amount of data stored in the RAM on the liquid crystal display (LCD) 48 to check whether the double insulated tube is abnormal have. Alternatively, the manager can know whether an abnormality has occurred by exchanging data through the communication and alarm unit 52 using the portable computer 54, by an alarm sound from the communication and alarm unit 52. As the portable computer 54, a notebook PC is typically used, and the communication and alarm unit 52 employs an asynchronous communication method, such as an RS-232 communication method. This communication can be done wirelessly as well as wired. In the construction system, the IC chip 44 always monitors the microcomputer 42 to automatically initialize the microcomputer 42 upon malfunction of the system, thereby normally operating the system. As the IC chip 44, a so-called one-chip of 8 bits is used.

Now, the leakage detection process by the leakage detection device having such a configuration will be described with reference to FIG. FIG. 4 is a view for explaining a process of detecting leakage by a leakage detection device of a construction system of a double insulated pipe according to the present invention. A, B and C denote the sensor wire 10 of the double insulated tube, the thick solid line denotes the cast iron tube 14 and the solid solid line denotes the return wire 12, The cast iron pipe 14 and the return wire 12, respectively. On the other hand, the portion indicated by the dotted rectangle in FIG. 3 represents the leak point.

First, in order to measure the loop resistance, that is, the resistance Rab between the points A and B, the microcomputer 42 controls the switch driver 46 to close only the switches SW1 and SW2 and open the remaining switches. Accordingly, the multiplexer 38 selects the value V0 of the voltage outputted from the first sub feedback amplifier AMP1 32 and applies it to the analog to digital converter A / D 40. [ The analog to digital converter 40 converts the analog voltage signal into a digital signal and outputs the digital signal to the microcomputer 42. The microcomputer 42 calculates the loop resistance value Rab according to the magnitude of the digital voltage value, .

(Where G is the negative feedback transfer function, Vout is the output voltage, and Vin is the input voltage)

When the above formula (1) is applied, the resistance value between the point A and the point B is obtained by the following equation (2) because VO / Vref = Rab / R1.

The short-circuit resistance R11 + R1x and the short-circuit point Lx are obtained when a short-circuit of the pipe occurs when measuring the loop resistance Rab using the above-described equation (2). Where R11 is the resistance between A and Sp, R1x is the resistance between B and Rp, and Lx is the distance between B and Rp.

In the above equation (2), the short-circuit resistance R11 + R1x = (VO · R1) / Vref and the resistance value is proportional to the length of the pipe, so Rab / (R11 + R1x) = L / Lx. Therefore, the short-circuit point to be obtained is determined by the following equation.

Next, in order to measure the leakage resistance Rleak, the microcomputer 42 controls the switch driver 46 to close only the switches SW3 and SW4 and open the remaining switches. Accordingly, the multiplexer 38 selects the voltage V1 output from the second sub feedback amplifier AMP2 34 and transfers the voltage V1 to the analog to digital converter A / D 40. Subsequently, the analog to digital converter A / D 40 converts the input analog voltage V1 into a digital value and applies it to the microcomputer 42, and the microcomputer 42 calculates the leakage resistance Rleak. This leakage resistance value is obtained by applying the above equation (1).

Applying the above equation (1), V1 / Vref = (Ropen + R11) / R2 (where Ropen means resistance between Sp point and Pp point). Therefore, the leakage resistance value Rleak is determined by the following equation.

Finally, in order to measure the leak point, the microcomputer 42 controls the switch driving unit 46 to close only the switches SW5 and SW6 and open the remaining switches. Accordingly, the multiplexer 38 selects the voltage V2 output from the buffer 36 and transfers it to the analog to digital converter A / D 40. The analog to digital converter A / D 40 converts the input analog voltage V2 to a digital value and applies it to the microcomputer 42. The microcomputer 42 calculates the leakage point Lx as follows.

First, according to the law of voltage distribution,

Lx / L = V2 / Vref is established. Therefore, the leak point Lx is finally determined by the following equation.

In measuring the water leakage point, at the time of 100% measurement, only the switch SW5 of the leak detection device is connected, and the voltage value V2 output from the buffer 36 is selected by the multiplexer 38 to be output to the analog to digital converter 40 And the microcomputer 42 calculates a value of 100% according to the change of the analog-to-digital converter 40. On the other hand, at the time of the 0% measurement, only the switch SW6 of the leak detection device is connected to select the voltage value V2 from the buffer 36 from the multiplexer 38 and transmit it to the analog to digital converter 40, 42 calculates a value of 0% according to the change of the analog-to-digital converter 42 thereof. Such a measurement is meaningless when the state of the double insulated pipe is normal. However, when the leakage occurs, the output voltage value V2 from the buffer 36 changes depending on the leakage amount.

The construction of the leakage detection device used in the construction system of the double insulated pipe described above with reference to FIGS. 3 and 4 and the process of finding the leakage point of the double insulation pipe by the leakage detection device should be kept dry It can be applied to a device for detecting wetness of a laboratory, a warehouse, etc., and a device for detecting a leak of an oil pipeline or a water pipe. In other words, the leak detection device used in a laboratory, a warehouse, etc. has the same configuration as the leak detection device used in the construction system of the double insulated pipe and finds the leak point by the same principle. Therefore, a detailed description thereof will be omitted.

FIG. 5 is a block diagram showing the configuration of a leakage detection device used in a management system for a double insulated tube according to the present invention. This dual insulated pipe management system is intended to be used as an operating system after the completion of construction. The leak detection device used in the double insulated pipe management system is a leak detection device used in the double insulated pipe construction system Except that a communication and alarm unit, a battery, and a portable computer are replaced by an FSK communication unit and a soft start power source.

The leakage sensing device comprises a current drive circuit 30 of a reference voltage source Vref connected to the sensor wire 10 of the double insulated tube to detect the state of the double insulated pipe shown in FIG. 1, A second sub feedback amplifier 34 provided for detecting the leakage resistance, a buffer 36 for temporarily storing the measurement data for measuring the leakage point, and a second sub feedback amplifier 32 provided for detecting the leakage point, A multiplexer 38 for selecting signals from the first and second negative feedback amplifiers 32 and 34 and the buffer 36 and an analogue output signal from the multiplexer 38 into a digital signal And an analog to digital converter (A / D) The leakage sensing device includes a microcomputer 42 having a built-in RAM for controlling the entire system and storing a predetermined amount of data, an interface 42 for controlling the operation of the switches, A push switch 50 for external input from the user, and a push-pull amplifier frame for reinforcing the communication output. The push-pull amplifier 50 includes an IC chip 44, A frequency shift keying (FSK) communication unit 58 for performing communication with the microcomputer 42, a soft start power source 60 for preventing inrush current and for initial stabilization of the power source, Respectively.

5, the current drive circuit 30 includes resistors R1 and R2 respectively connected to the reference voltage source Vref and the first and second sub-feedback amplifiers 32 and 34, And switches SW1 and SW5 which are respectively connected in parallel with each other. Since the length of the double insulated pipe is relatively short during the construction of the double insulated tube, the current from the reference voltage source Vref flows a lot in the measurement of the leak point because the resistance value of the sensor wire 10 is relatively small. This phenomenon is supposed to compensate for the phenomenon that the voltage is lowered. In addition, a loop method is used to measure the loop resistance value. The switch SW1 is connected to one end A of the sensor wire 10 and the input end of the first sub feedback amplifier AMP1 32 and the switch SW2 is connected to one end B of the return wire and the second sub feedback amplifier AMP2 34 The switch SW3 is connected to one end A of the sensor wire 10 and the input end of the second sub feedback amplifier AMP2 and the switch SW4 is connected to one end B of the pipe C and the second sub feedback amplifier AMP2 34, Respectively. The switch SW5 is connected between the reference voltage source Vref and one end A of the sensor wire 10 and the switch SW6 is connected between one end B of the return wire 12 and the ground potential.

In the case of the leak detection device located at a remote location from the central monitoring device or the signal amplifier in the field condition, the FSK communication part 58 of the leakage detection device having the above- A push-pull amplifier for reinforcing an output signal is provided at an output terminal thereof in order to solve the problem that the signal is attenuated by the delay circuit and communication becomes difficult. The soft start power supply 60 employs a so-called soft start circuit in order to prevent an inrush current into the system and to stabilize the power supply initially. The IC chip 44 always monitors the microcomputer 42 and automatically causes the microcomputer to be initialized when the system malfunctions, thereby functioning normally to operate the system. As the IC chip 44, a so-called 8-bit one-chip is used.

In operation of the system, the administrator can check the operation state of the water leakage sensing device through the display contents of the liquid crystal display 48 and detect the state of the double insulation pipe. Also, the leakage detection device The operating status of the central monitoring device can be confirmed in the field.

In the above-described double insulated tube management system, the process of detecting the leak point by the leak detector is the same as the leak point detection process in the double insulated pipe construction system described above with reference to FIGS. 3 and 4 A description thereof will be omitted.

FIG. 6 schematically shows the overall structure of a double insulated tube management system according to the present invention. FIG. 6 is a view similar to the actual construction of the double insulated pipe.

In the configuration of FIG. 6, the dotted line represents a signal transmission line for supplying power between the central monitoring device C1 and the water leakage sensing devices Li, and for sending / receiving data, and a solid line represents a double insulation pipe network. The signal transmission line indicated by the dotted line is connected in a valve box or a hand hall installed at a specific site in the pipeline network. It is installed in accordance with the conditions of the site within the maximum length limit of the double insulated pipe which can be detected by the leak detection device such as the test point (TP), and the correction for the abnormality of the double insulated pipe or the abnormality of the leak detection device It is used as a point. This test point connects the lead wire drawn from the double insulated pipe inside the waterproof connection box. The installation location may be a valve box installed at a specific location on the site, or a connection box panel and a machine room installed at a hand hole or a loop separation point.

The central monitoring device C1 sets the reference data, modifies the set data, and transmits the data to the leak detectors Li via the signal transmission line. The central monitoring device C1 receives the data detected by the leak detectors Li, Keep the thermostat condition by day or month. The system administrator can observe the transition of the state of the double insulated pipe by checking the stored data in the central monitoring device (C1) through the monitor screen or the output of the printer. The central monitoring device (Cl) is usually capable of communicating with 255 leak detectors, though this depends on the site conditions.

The power supply PS is capable of varying the voltage of a predetermined width and is capable of supplying power to 10 leak detectors normally, though it depends on the field conditions. And also serves to relay data exchange between the central monitoring device C1 and the leak detection devices Li.

However, when the signal output from the central monitoring device C1 reaches a certain distance, the signal passing through the signal transmission line becomes so small that it can not be captured. Therefore, the water leakage detection device L from the central monitoring device C1, If they are apart from each other, the mutual communication becomes impossible. The signal compensating device AP serves to amplify the data signals communicated between the central monitoring device C1 and the water leakage detecting device L so that they can communicate smoothly with each other.

The leak detector L detects an abnormal condition due to leakage, disconnection or short-circuit of the double insulated pipe and sends the data to the central monitoring device C1. The leak detection device L is installed in a maximum length for monitoring the double insulated pipe and is suitable for the site conditions. As shown in the above description, the external battery 56 and the portable computer 54 ), And can be operated as a management system by simply exchanging the PCB card after completion.

FIG. 7 shows the structure of the signal compensator AP in the system configuration of FIG. 6 in detail. As described above, the signal compensating apparatus AP has a leak detecting apparatus L installed at a predetermined distance after the signal is attenuated and distorted by the signal transmission line as the distance from the central monitoring apparatus C1 increases, (C1), it is possible to perform communication by amplifying the attenuated signal and restoring it to the original signal. 7, the signal compensation device AP includes two transformers 62 and 64 connected to signal transmission lines and four switches SW1 and SW2 connected to the outputs of the transformers 62 and 64, A small signal amplifier stage 66 connected to the switches SW7 and SW10 respectively connected to the first and second transformers 62 and 64 among the switches and the first and second transformers 62 and 64 connected to the first and second transformers 62 and 64, And an output signal amplifier stage 68 connected to the switches SW9 and SW8 respectively connected to the switches SW1 and SW8. The small signal amplification stage 66 and the output signal amplification stage 68 are connected to the FSK communication unit 72. In addition, the signal compensation device AP includes an IC chip 70 provided to control the operation of the switches. When the data signal is inputted from the signal transmission line in the direction of the central monitoring device C1 in the signal compensation device AP having the above-described configuration, the switches SW7 and SW8 are closed under the control of the IC chip 70, Amplified by a push-pull amplifier of an output signal amplification stage 68 and then amplified by a switch SW8, a second transformer 64, Through a signal transmission line in the direction of the water leakage sensing device L to the water leakage sensing device L located at the rear end. At this time, the output signal of the small signal amplifying stage 66 is input to the FSK communication unit 72, converted into digital data, and then supplied to the IC chip 70, and the IC chip 62 analyzes the digital data. When it is confirmed that the signal from the central monitoring device C1 is completed, the switches SW7 and SW8 are opened and the switches SW9 and SW1O are closed.

On the other hand, when data is sent from the leak detection device L at the rear end of the signal compensation device AP, the data signal is sequentially transmitted to the signal transmission line in the direction of the leak detection device L, the second transformer 64, The signal is transmitted to the central monitoring apparatus C1 via the path of the signal transmission line in the direction of the amplification stage 66, the output signal amplification stage 68, the switch SW9, the first transformer 62 and the central monitoring apparatus C1. At this time, similarly, the output signal of the small signal amplifier stage 66 is inputted to the FSK communication section 58, converted into digital data, and the data is analyzed in the IC chip 70. When it is confirmed that the signal from the leak detection device L is completed, the switches SW7 and SW8 are closed and the switches SW9 and SW10 are closed.

As described above, the signal compensator AP of the present invention analyzes the contents communicated between the central monitoring device C1 and the water leakage sensing device Li in the IC chip 70, and adopts a synchronization method for determining the input / output direction of the signal have.

According to the piping construction and management system of the present invention as described above, it is possible to quickly and accurately detect anomalies that may occur during the construction and management operations of the wetting and double insulation pipes and to repair them early, It is possible to prevent high cost and environmental pollution.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims.

FIG. 1 is a view showing a structure of a double insulated tube to which the present invention is applied; FIG.

FIG. 2 is a view showing a sensing cable to which the present invention is applied; FIG.

FIG. 3 is a block diagram showing the configuration of a leakage detection device used in a double insulated tube installation system according to the present invention. FIG.

FIG. 4 is a view for explaining a process of detecting leakage of water by the leak detection device of FIG. 3; FIG.

FIG. 5 is a block diagram showing a configuration of a leakage detection device used in a double insulated tube management system according to the present invention. FIG.

6 is a block diagram of an overall configuration of a dual insulated tube management system according to the present invention;

7 is a block diagram showing in detail the signal compensation device shown in FIG. 6;

Description of the Related Art [0002]

10, 20: sensor wire 12, 22: return wire

14: Cast iron pipe 16: Plastic pipe

18: Insulation material 24: Wire

26: Stranded shield 30: Current drive circuit

32: 1st part feedback amplifier 34: 2nd part feedback amplifier

36: buffer 38: multiplexer

40: digital-to-analog converter 42: microcomputer

44: IC chip 46: switch driver

48: liquid crystal display 50: push switch

52: Communication and alarm unit 54: Portable computer

56: Battery 58: FSK communication unit

60: Soft start power supply 62: First transformer

64: second transformer 66: small-signal amplifier stage

68: Output signal amplification stage 70: IC chip

72: FSK communication section

Claims (9)

There is provided a double insulated pipe construction system in which an abnormal phenomenon occurring during construction of a double insulated pipe can be detected and repaired in an early stage, Current driving means of a reference voltage source connected to the sensor wire in the double insulated tube for monitoring the state of the double insulated tube; First auxiliary feedback amplifying means connected to the current driving means for detecting a loop resistance at the time of leak detection; Second auxiliary feedback amplifying means connected to the current driving means for detecting leakage resistance at the time of leak detection; Buffer means connected to a cast iron pipe in the double insulated tube for temporarily storing measurement data for measuring a leak point in case of leakage; A RAM for controlling the entire construction system, detecting leakage of water and detecting a leakage position from the output signals of the first and second auxiliary feedback amplifying means and the buffer means, and storing data obtained at the time of detecting the leakage With a microcomputer; A multiplexer for selecting signals from the first and second sub feedback amplifiers and the buffer means and transmitting the signals to the microcomputer; Display means connected to the microcomputer for displaying a predetermined amount of data stored in the RAM so that the system user can check whether the double insulated tube is abnormal; A push switch connected to the microcomputer for transmitting an external input from a user to the microcomputer; A portable computer for archiving data of the construction system; And a communication and alarm unit connected to the microcomputer and the portable computer for exchanging data with the portable computer and for performing display at the time of occurrence of an anomaly, The double insulated tube is composed of a cast iron tube, a plastic tube surrounding the cast iron tube, a sensor wire filled with a cast iron tube and a plastic tube, a sensor wire having a predetermined resistance value, And a heat insulating material having a return wire embedded therein. The method according to claim 1, Wherein the first sub feedback amplifying means has its input terminal connected to the current driving means via a first switch and its output terminal connected to a return wire in the double insulated tube via a second switch, Wherein the input terminal of the means is connected to the current driving means via the third switch and the output terminal thereof is connected to the cast iron pipe in the double insulated tube via the fourth switch. 3. The method according to claim 1 or 2, And an integrated circuit chip connected to the microcomputer and the switch driving unit to monitor the state of the microcomputer and to control the operation of the switches. A dual insulated pipe management system for detecting and repairing an anomaly occurring during management operation of a double insulated pipe, Current driving means of a reference voltage source connected to the sensor wire in the double insulated tube for monitoring the state of the double insulated tube; First auxiliary feedback amplifying means connected to the current driving means for detecting a loop resistance at the time of leak detection; Second auxiliary feedback amplifying means connected to the current driving means for detecting leakage resistance at the time of leak detection; Buffer means connected to a cast iron pipe in the double insulated tube for temporarily storing measurement data for measuring a leak point in case of leakage; Wherein the control unit is configured to control the entire management system of the double insulated tube and to detect the leak detection and leakage positions from the output signals of the first and second auxiliary feedback amplification units and the buffer unit, A microcomputer with built-in RAM: A multiplexer for selecting signals from the first and second sub feedback amplifiers and the buffer means and transmitting the signals to the microcomputer; Display means connected to the microcomputer for displaying a predetermined amount of data stored in the RAM so that the system user can check whether the double insulated tube is abnormal; A push switch connected to the microcomputer for transmitting an external input from the user to the microcomputer; A push-pull amplifier for reinforcing a communication output, and communicating with the microcomputer to perform communication with the microcomputer; And a soft start power source connected to the communication means for preventing an inrush current and for initial stabilizing of the power supply device, Wherein the sensing cable comprises a sensor wire having a constant resistance and having grooves formed at regular intervals in the cover, a return wire having a paddle wire coated with a complete insulator, a wire having a paddle wire covered with the moisture absorbing insulator, And a twisted shield that surrounds the circumferential insulator shell. The leakage inspecting apparatus according to claim 1 or 2, wherein the insulated waterproofing insulator comprises: a sensor wire; a return wire; a cylindrical water absorbing insulator surrounding the return wire; 5. The method of claim 4, Wherein the first sub feedback amplifying means has its input terminal connected to the current driving means via a first switch and its output terminal connected to a return wire in the double insulated tube via a second switch, Wherein the input terminal of the means is connected to the current driving means via the third switch and the output terminal of the means is connected to the cast iron pipe in the double insulated tube via the fourth switch. The method according to claim 10 or 11, Further comprising an integrated circuit chip connected to the microcomputer and the switch driving unit to monitor the state of the microcomputer and to control the operation of the switches. The present invention relates to a wetting and leakage detection system for a dual insulated tube for detecting wetness of a laboratory or a warehouse to be kept dry by using a sensing cable and detecting leakage of a water pipe, A current driving means of a reference voltage source connected to the sensor wire in the sensing cable for monitoring the state of the sensing cable; First negative feedback amplifying means connected to said current driving means for detecting a loaf resistance at the time of wetting and leakage detection; Second negative feedback amplifying means connected to said current driving means for detecting wetting and leakage resistance at the time of wetting and leakage detection; Buffer means for temporarily storing measurement data to measure wetting and leaking points in the sensing cable in wet and leaking conduction; Wherein said wetting and leaking detection system is adapted to control the entire wetting and leaking detection system and to detect wetting and leakage detection and wetting and leakage positions from the output signals of said first and second auxiliary feedback amplifying means and said buffer means, A microcomputer having a RAM for storing data; And display means connected to the microcomputer for displaying a predetermined amount of data stored in the RAM so that the system user can check whether the double insulated tube is abnormal, The double insulated tube is composed of a cast iron tube, a plastic tube surrounding the cast iron tube, a sensor wire filled with a cast iron tube and a plastic tube, a sensor wire having a predetermined resistance value, And a heat insulating material having a return wire embedded therein. A dual insulated pipe management system for detecting and repairing an anomaly occurring during management operation of a double insulated pipe, A second current feedback means connected to the current driving means for detecting a loop resistance at the time of leakage detection, and a second feedback amplifier means Second auxiliary feedback amplifying means connected to the current driving means for detecting a leakage resistance at the time of leakage detection, buffer means connected to the cast iron pipe in the double insulation pipe for measuring a leakage point at the time of leakage detection, A microcomputer connected to the microcomputer and configured to store a predetermined amount of data stored in the RAM so that a system user can check whether the double insulated tube is abnormal or not, Display means for displaying an image, A push switch for transmitting an external input from the microcomputer to the microcomputer, and a push-pull amplifier for reinforcing the communication output, the communication device being connected to the microcomputer and performing communication with the microcomputer, And a soft start power supply connected to the power supply for preventing the inrush current and for stabilizing the power supply in the initial stage; A power supply for supplying power to the water leakage sensing device; A central monitoring device for performing data exchange with the leakage detection device and managing the data; And a signal compensating device for amplifying a signal communicated between the water leakage sensing device and the central monitoring device. 9. The method of claim 8, The signal compensating device comprises first and second transformers connected to a signal transmission line, four switches connected to the outputs of the first and second transformers, respectively, and a first switch and a second switch respectively connected to the first and second transformers A small signal amplification stage connected to two connected switches and an output signal amplification stage connected to two switches respectively connected to the first and second transformers.