KR20240012020A - Leak Monitoring System for Double Insulation Tube of Regional Heating - Google Patents

Abstract

The present invention provides a construction and management system for double insulation pipes that allows for quick and accurate detection of abnormalities such as water leaks, short circuits, and disconnections that may occur during the construction and management of double insulation pipes and for early repair.
In addition, it is possible to provide a pipe construction and management system with an improved structure that is not only convenient for users to use, but also allows more accurate and rapid detection of abnormalities, as well as a double insulation pipe construction and management system and the pipe A leak detection device with an improved structure that can be used in a multi-purpose management system can be provided.

Description

Leak Monitoring System for Double Insulation Tube of Regional Heating}

The present invention relates to a district heating double insulation pipe leakage monitoring system. In particular, the construction and management system for double insulation pipes that allows early detection and repair of abnormalities that occur during the construction and operation of double insulation pipes and their use therefor. It is about a water leak detection device.

Generally, in district heating pipes buried underground, if there is a leak from a pipe due to a defect or damage to the pipe, there is great difficulty in accurately locating the leak point. If abnormalities in these buried pipelines are not identified early and accurately and repaired promptly, it may cause economic loss as well as environmental pollution. To solve this problem, the development of a pipeline management system that detects and notifies leakage status and leakage points of buried pipelines at an early stage has been actively conducted in recent years.

However, in the construction and management of pipelines for transporting fluids, especially double insulation pipes, water leakage from the cast iron pipe that makes up the double insulation pipe or moisture infiltration from the outside of the plastic pipe causes internal heat leakage. This not only causes heat loss, but also rapidly corrodes the cast iron pipe, and at the same time, a lot of heat transferred to the exterior surrounding the cast iron pipe expands the exterior, causing secondary destruction of the pipe connection. This phenomenon spreads horizontally in the underground area where the pipe is buried, causing major damage to the pipe connection area in addition to heat loss from the pipe.

In addition, in the construction of double insulation pipes, construction and burial were carried out without any problems during the construction, but pipe abnormalities due to defects in the double insulation pipe itself and valves that were not noticed during construction, or double insulation due to carelessness during construction. When pipe damage occurs, if repairs are not made immediately but after the surrounding construction is completed, it will be extremely difficult to identify the location of the defect, so the location of the defect must be located and repaired as soon as it occurs. Moreover, in the early stage of construction, the construction volume of double insulation pipes is small, so inspections can be made several times a day. However, as the construction volume increases, the number of inspections tends to decrease, so even if a problem occurs in the double insulation pipes, it is only after the leakage has progressed to a considerable extent that it can be inspected. As a result of the accumulation of abnormalities that can be discovered, even greater difficulties arise in repairs as construction approaches.

In this way, the most important thing in the construction of double thermal insulation pipes is accurate construction, but even if accurate construction is performed, it is not maintained in a normal state until the management and operation system is activated, so abnormalities due to water leaks, disconnections, short circuits, or other causes cannot be detected early. Betting is extremely difficult at the moment.

However, the conventional pipeline management system was not only not very effective in the construction and management of the double insulation pipe as described above, but also had many inconvenient aspects in operating the system. Additionally, the conventional pipe management system can only be used to detect leaks in water pipes and oil pipelines, but cannot be applied to detect moisture in laboratories and warehouses that must be kept dry.

Therefore, the present invention was conceived in consideration of the above circumstances, and the purpose of the present invention is to quickly and accurately find abnormalities such as water leaks, short circuits, and disconnections that may occur during the construction and management of double thermal insulation pipes and to repair them at an early stage. The purpose is to provide a construction and management system for double thermal insulation pipes.

Another object of the present invention is to provide a pipe construction and management system with an improved structure that is not only convenient for users to use, but also allows for more accurate and rapid detection of abnormalities.

Another object of the present invention is to provide a leak detection device of an improved structure that can be used in the construction and management system of the double insulation pipe and the multi-purpose management system of the pipe.

In order to achieve the above-mentioned objectives, the water leak detection device of the double insulating pipe construction system according to the present invention includes a current driving means of a reference voltage source connected to a sensor wire in the double insulating pipe to monitor the state of the double insulating pipe; a first negative feedback amplifying means connected to the current driving means to detect loop resistance when water leakage is detected; a second negative feedback amplifying means connected to the current driving means to detect water leakage resistance when water leakage is detected; a buffer means connected to the cast iron pipe in the double insulating pipe to temporarily store measurement data to measure the point of water leakage when water leakage is detected; A microcomputer that controls the entire construction system, detects water leakage and the location of the water leak from the output signals of the first and second negative feedback amplification means and the buffer means, and has a built-in RAM for storing data obtained when detecting a water leak; ; A multiplexer for selecting the signals from the first and second negative feedback amplifiers and the buffer means and transmitting them to the microcomputer; a certain amount stored in RAM, which is connected to the microcomputer so that the system user can check whether the double insulating tube is abnormal; display means for displaying data; a push switch connected to the microcomputer to transmit external input from the user to the microcomputer; A portable computer for data processing of construction systems; It is connected to a microcomputer and a portable computer to exchange data with the portable computer, and is equipped with a communication and alarm unit to display when an abnormality occurs.

The present invention provides a construction and management system for double insulation pipes that allows for quick and accurate detection of abnormalities such as water leaks, short circuits, and disconnections that may occur during the construction and management of double insulation pipes and for early repair.

In addition, it is possible to provide a pipe construction and management system with an improved structure that is not only convenient for users to use, but also allows more accurate and rapid detection of abnormalities, as well as a double insulation pipe construction and management system and the pipe A leak detection device with an improved structure that can be used in a multi-purpose management system can be provided.

Figure 1 is a block diagram showing the configuration of a water leak detection device used in the double thermos pipe monitoring system according to the present invention.
Figure 2 is a block diagram showing the configuration of a water leak detection device used in the double insulating pipe monitoring system according to the present invention.

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

A block diagram shows the configuration of a water leak detection device used in the double insulation pipe construction system according to the present invention. Referring to FIG. 3, the water leak detection device includes a current driving circuit ( 30), a first negative feedback amplifier 32 provided to detect loop resistance, a second negative feedback amplifier 34 provided to detect water leak resistance, and measurement data to measure the water leak point. A buffer 36 for temporary storage, a multiplexer 38 for selecting signals from the first and second negative feedback amplifiers 32 and 34 and the buffer 36, and a digital output signal from the multiplexer. An analog-to-digital converter (A/B) 40 is provided for conversion into a signal. In addition, the water leak detection device includes a microcomputer (42) with built-in RAM to control the entire system and store a certain amount of data, and an IC that is interfaced to control the operation of switches and monitor the status of the computer. A chip 44, a switch driver 46 for driving the switches, a push switch 50 for external input from the user, a portable computer 54 for data processing of the construction system, and a portable computer It is equipped with a communication and alarm unit (52) for data exchange with (54) and display when an abnormal phenomenon occurs, and a battery (56) for supplying power to the system.

In the water leak detection device shown in FIG. 1, the current driving circuit 30 includes resistors R1 and R2 connected to the reference voltage source Vref and the first and second negative feedback amplifiers 32 and 34, respectively, and these resistors It consists of SW5 connected in parallel to R1 and R2, respectively. In this current driving circuit 30, when constructing a double insulating pipe, the length of the double insulating pipe is short and the resistance value of the sensor wire 10 is relatively small, so when measuring the water leak point, a large amount of current flows from the reference voltage source Vref, which causes the reference voltage source Vref to flow. As the voltage decreases, it is designed to compensate for this phenomenon. And the negative feedback method is adopted to measure the loop resistance value. Meanwhile, switch SW1 is connected to one end (A) of the sensor wire 10 and the input terminal of the first negative feedback amplifier AMP1 (32), and switch SW2 is connected to one end (B) of the return wire 12 and the first negative feedback amplifier AMP2 ( 32), switch SW3 is connected to one end (A) of the sensor wire 10 and the input terminal of the second negative feedback amplifier AMP2 (34), and switch SW4 is connected to one end (B) of the pipe and the second negative feedback amplifier AMP2. Each is connected to the output terminal of (34). Then, switch SW5 is connected between the reference voltage source Vref and one end (A) of the sensor wire 10, and switch SW6 is connected between one end (B) of the return wire 12 and the ground potential.

When constructing a double thermos pipe, the water leak detection device according to the present invention as shown in FIG. 1 continuously detects the state of the double thermos pipe using a battery 56, and sends the data obtained during detection to the microcomputer 42. Save it to the built-in RAM. Accordingly, the system administrator can check whether there is an abnormality in the double thermal insulation tube by operating the push switch 50 connected to the microcomputer 42 and displaying a certain amount of data stored in the RAM on the liquid crystal display (LCD) 48. there is. In contrast, the manager can use the portable computer 54 to exchange data through the communication and alarm unit 52 to determine whether an abnormality occurs by an alarm sound from the communication and alarm unit 52. A laptop PC is typically used as the portable computer 54, and the communication and alarm unit 52 uses an asynchronous communication method, such as an RS-232 communication method. Such communication is possible both wired and wirelessly. And in the construction system, the IC chip 44 always monitors the microcomputer 42 and automatically initializes the microcomputer 42 when the system malfunctions, thereby operating the system normally. This IC chip 44 uses a so-called 8-bit one-chip.

Now, the water leak detection process by the water leak detection device of this configuration will be described with reference to FIG. 4. Figure 4 is a diagram illustrating the process of detecting water leakage by the water leak detection device of the double thermal insulation pipe construction system according to the present invention. In Figure 4, the dotted line represents the sensor wire 10 of the double insulating pipe, the thick solid line represents the cast iron pipe 14, the thin solid line represents the return wire 12, and A, B, and C represent the sensor wire 10. , indicate the corresponding measurement points of the cast iron pipe 14 and the return wire 12, respectively. Meanwhile, the dotted rectangular portion in Figure 3 indicates a water leak point.

First, in order to measure the loop resistance, that is, the resistance Rab between points A and B, the microcomputer 42 controls the switch driver 46 to close only switches SW1 and SW2 and open the remaining switches. Accordingly, the multiplexer 38 selects the voltage value V0 output from the first negative feedback amplifier AMP1 (32) and applies it to the analog-to-digital converter A/D (40). Subsequently, the analog-to-digital converter 40 converts the analog voltage signal into a digital signal and outputs it to the microcomputer 42, and the microcomputer 42 calculates the loop resistance value Rab according to the size of this digital voltage value by the following formula. Calculate using .

In measuring the water leak point in this way, when measuring 100%, only switch SW5 of the water leak detection device is connected, and the voltage value V2 output from the buffer 36 is selected by the multiplexer 38 and converted to the analog-to-digital converter 40. The data is transmitted and the microcomputer 42 calculates a value of 100% according to the change in the analog-to-digital converter 40. On the other hand, when measuring 0%, only the switch SW6 of the water leak detection device is connected, and the voltage value V2 output from the buffer 36 is selected at the multiplexer 38 and transmitted to the analog-to-digital converter 40 and transmitted to the microcomputer ( 42) calculates the value of 0% according to the change in the analog-to-digital converter 42. If the condition of the double insulating pipe is normal, such measurement has no meaning, but when water leakage occurs, the output voltage value V2 from the buffer 36 changes depending on the amount of water leakage, so this value is measured if there is an abnormality.

The configuration of the water leak detection device used in the double insulation pipe construction system and the process of finding the leak point of the double heat insulation pipe using this water leak detection device are used to detect moisture in laboratories and warehouses that must be kept dry, and in oil and water pipes, etc. It can also be applied to devices for detecting water leaks. In other words, the water leak detection device used in laboratories, warehouses, etc. has the same configuration as the water leak detection device used in the double insulation pipe construction system and finds the water leak point based on the same principle. Therefore, detailed explanation regarding this will be omitted.

Figure 2 is a block diagram showing the configuration of a water leak detection device used in the management system of a double thermal insulation pipe according to the present invention. The management system of this double thermal insulation pipe is intended to be used as an operating system after construction is completed. The water leak detection device used in the management system of the double thermal insulation pipe is the water leak detection device used in the construction system of the double thermal insulation pipe as described above. It has the same configuration except that the communication and alarm unit, battery, and portable computer are replaced with the FSK communication unit and soft start power source.

The water leak detection device includes a current driving circuit 30 of a reference voltage source (Vref) connected to the sensor wire 10 of the double thermos pipe to detect the state of the double thermos pipe shown in FIG. 1, and a loop (Loop) ) A first negative feedback amplifier 32 provided to detect resistance, a second negative feedback amplifier 34 provided to detect water leak resistance, and a buffer 36 to temporarily store measurement data to measure the water leak point. and a multiplexer 38 for selecting signals from the first and second negative feedback repeaters 32 and 34 and a buffer 36, and converting the analog output signal from the multiplexer 38 into a digital signal. An analog-to-digital converter (A/D) 40 is provided for this purpose. In addition, the water leak detection device includes a microcomputer 42 with built-in RAM to control the entire system and store a certain amount of data, and an interface to control the operation of switches and monitor the status of the microcomputer 42. It includes an IC chip 44, a switch driver 46 to drive the switches, a push switch 50 for external input from the user, and a push pull amplifier frame to reinforce the communication output. A frequency shift keying (hereinafter referred to as FSK) communication unit 58 for communicating with the microcomputer 42, and a soft start power supply 60 for preventing inrush current and initial stabilization of the power supply. Equipped with

In the water leak detection device, the current driving circuit 30 includes resistors R1 and R2 connected to the reference voltage source Vref and the first and second negative feedback amplifiers 32 and 34, respectively, and these resistors R1 and R2 in parallel, respectively. It consists of connected switches SW1 and SW5. In this current driving circuit (30), when constructing a double insulating pipe, the length of the double insulating pipe is short and the resistance value of the sensor wire (10) is relatively small, so when measuring the water leak point, a large amount of current flows from the reference voltage source Vref, which causes the reference voltage to flow. As the voltage decreases, it is designed to compensate for this phenomenon. And the sub-measure method is adopted to measure the loop resistance value. Meanwhile, switch SW1 is connected to one end (A) of the sensor wire 10 and the input terminal of the first negative feedback amplifier AMP1 (32), and switch SW2 is connected to one end (B) of the return wire and the second negative feedback amplifier AMP2 (34). At the output terminal, switch SW3 is connected to one end (A) of the sensor wire 10 and the input terminal of the second negative feedback amplifier AMP2, and switch SW4 is connected to one end (B) of the pipe (C) and the second negative feedback amplifier AMP2 (34). Each is connected to the output terminal of . Then, switch SW5 is connected between the reference voltage source Vref and one end (A) of the sensor wire 10, and switch SW6 is connected between one end (B) of the return wire 12 and the ground potential.

When operating a management system for double thermal insulation pipes, in the water leak detection device configured as described above, the FSK communication unit 58 has a signal transmission line in the case of a water leak detection device located far away from the central monitoring device or signal amplifier due to field conditions. To solve the problem of communication being difficult due to signal attenuation, a push-pull amplifier is provided at the output stage to reinforce the output signal. The soft start power supply 60 employs a so-called soft start circuit to prevent inrush current into the system and to achieve initial stabilization of the power supply. In addition, the IC chip 44 always monitors the microcomputer 42 and automatically initializes the microcomputer when the system malfunctions, thereby allowing the system to operate normally. As this IC chip 44, a so-called 8-bit one-chip is used.

When operating the system, the manager can check the operation status of the water leak detection device through the display contents of the liquid crystal display 48 to detect the status of the double insulating pipe, and the water leak detection device called by the central monitoring device in the communication standby state. By checking the number, the operating status of the central monitoring device can be checked on site.

In the management system of the double insulation pipe as described above, the process of detecting the water leak point by the water leak detection device is the same as the process of detecting the water leak point in the construction system of the double insulation pipe previously described with reference to FIG. 2, so the description thereof will be omitted.

According to the pipe construction and management system of the present invention as described above, the efficiency of the system is improved by quickly and accurately detecting abnormalities that may occur during the construction and management of wet management and double thermal insulation pipes and enabling early repair. and can prevent economic losses and environmental pollution.

Through the above-described content, those skilled in the art will be able to see that various changes and modifications can be made without departing from the technical idea of the present invention. Accordingly, the technical scope of the present invention should not be limited to what is described in the detailed description of the specification, but should be determined by the scope of the patent claims.

Claims (3)

Current driving means of a reference voltage source connected to a sensor wire in the double thermos tube to monitor the state of the double thermos tube;
a first negative feedback amplifying means connected to the current driving means to detect loop resistance when water leakage is detected;
a second negative feedback amplifying means connected to the current driving means to detect water leakage resistance when water leakage is detected;
a buffer means connected to the cast iron pipe in the double insulating pipe to temporarily store measurement data to measure a water leak point when a water leak is detected;
For controlling the entire management system of the double thermos pipe, detecting water leakage and the location of water leakage from the output signals of the first and second negative feedback amplification means and the buffer means, and storing data obtained when detecting the water leakage. A microcomputer with built-in RAM and:
a multiplexer for selecting signals from the first and second negative feedback amplifiers and the buffer means and transmitting them toward the microcomputer;
a display means connected to the microcomputer to display a certain amount of data stored in the RAM so that the system user can check whether the double insulation tube is abnormal;
a push switch connected to the microcomputer to transmit an external input from the user to the microcomputer;
Communication means including a push-pull amplifier for reinforcing communication output and being connected to the microcomputer to perform communication with the microcomputer;
A soft start power supply connected to the communication means to prevent inrush current and achieve initial stabilization of the power supply device,
The sensing cable includes a sensor wire having a constant resistance value and grooves formed at regular intervals on the sheath, a return wire having a bare copper wire completely coated with an insulator, a conductor having a galvanized bare copper wire covered with an insulating material for moisture absorption, and A district heating double insulation pipe leak monitoring system comprising a sensor wire, a columnar moisture-absorbing insulator surrounding the return wire and the conductor, and a stranded wire shield surrounding the columnar insulator shell. According to claim 1,
The first negative feedback amplifying means has its input end connected to the current driving means via a first switch, and its output end is connected to the return wire in the double heat insulating tube via a second switch, and the second negative feedback amplifying means is connected to the current driving means. A district heating double insulation pipe water leak monitoring system, wherein the input end is connected to the current driving means via a third switch and the output end is connected to the cast iron pipe in the double insulation pipe via a fourth switch. According to clause 1,
A district heating double insulation pipe water leak monitoring system, characterized in that it is connected to the microcomputer and the switch driver and further includes an integrated circuit chip that monitors the status of the microcomputer and controls the operation of the switches.