KR100947664B1 - System for Inspecting a Wrong Connecting of a Drain Pipe using a Electricity Conductivity and Method using the Same - Google Patents

Abstract

The present invention relates to a fault contact inspection system and inspection method of sewage pipe using electrical conductivity. The false contact inspection system of the sewage pipe using the electrical conductivity of the present invention is an electrical signal generator 20 for converting the digital signal generated by oscillating the signal at a predetermined time interval to the current and applied to the sewer pipe 10, and the electrical signal generation The electrical signal detection device 30 detects the current generated by the device 20 and converts it into a digital signal for frequency analysis, and the electrical signal detected by the electrical signal detection device 30 It includes a central processing unit 40 to calculate the impedance to determine whether or not the sewage pipe. The inspection method of the sewage pipe using the electrical conductivity of the present invention includes applying a current to the sewage pipe 10, detecting and analyzing the current, and determining whether or not the sewage pipe is wrong based on the analyzed results . According to the present invention configured as described above, it is possible to inspect various types of wrong contacts because the current is determined by sending a current, thereby reducing the inspection time.

Sewage pipe mis-contact, electrical conductivity, impedance

Description

System for Inspecting a Wrong Connecting of a Drain Pipe using a Electricity Conductivity and Method using the Same}

The present invention relates to a fault contact inspection system and inspection method of sewage pipes using electrical conductivity, and more particularly, to check the sewage pipes by using an electric conductivity by the impedance value of the sewage pipe measured by sending an AC current to the sewage pipe. The present invention relates to a faulty inspection system and inspection method for sewage pipes using electrical conductivity.

Sewage pipes for treating domestic wastewater and rainwater are mainly composed of sewage pipes, and the sewer pipes are composed of sewage pipes for treating domestic wastewater and rainwater pipes.

The sewage pipe and rainwater pipe constituting the sewer type sewer pipe are installed to be separated from each other. The sewage pipe and rainwater pipe are connected to each other in a specific part.

If the sewage pipe is in contact with the sewage pipe, the sewage flows into the rainwater pipe in Cheongcheon-si, which causes river and water pollution. This sewage failure has a high rate of occurrence, which corresponds to 30% of all sewer pipes.

In order to prevent the sewage contaminant phenomenon, the importance of the sewage contaminant is being selected as the first step to implement the sewage pipe maintenance project, which is a national project to invest 36 trillion won for 20 years.

1A and 1B show a sewage pipe fault inspection method according to the prior art. FIG. 1A shows Smoke Testing. The smoke test is a method of selecting a section of sewage pipes to be investigated and taking measures to prevent smoke from leaking outside of that section, and then generating smoke in the manhole to investigate the area where the false contact occurred.

If smoke is generated in the manhole to be investigated, the smoke is spread through all the connecting pipes connected to the sewer pipe, so that smoke is generated in the sewage pipe which is erroneous, so it is possible to know whether or not the sewage pipe has occurred.

1B shows dye water testing. Dye test is a method to check the contact status of sewage pipes by analyzing tracer's path and concentration by flowing tracer.

In the dye test, tracers such as dyes are allowed to flow into sewers connected to sewer pipes, and the contact status of sewer pipes can be checked by observing whether tracers are detected in the manhole of each sewer.

However, in the conventional sewage pipe inspection method according to the prior art as described above has the following problems.

In the case of the smoke test, because the leaking state of the sewer pipe through the smoke leaking to the outside there is a problem that you do not know exactly where the smoke is leaking on a windy day.

In the case of the dye test, a large amount of water must be flowed to send the tracer to the sewer pipe, and the tracer is easy to handle and has a property of biodegradability and chemical reaction with sediment in the sewer pipe.

The present invention is to solve such a conventional problem, an object of the present invention is to be able to inspect a variety of incorrect contact form without being influenced by the external environment during the contact inspection.

Another object of the present invention is to minimize the cost and time required for misinspection.

According to a feature of the present invention for achieving the above object, the fault contact inspection system of the sewage pipe using the electrical conductivity of the present invention is an electrical signal generator for generating and applying an electrical signal to the internal material of the sewage pipe; An electrical signal detection device for detecting an electrical signal generated by the electrical signal generator; and an electrical signal detected by the electrical signal detection device to calculate an impedance value corresponding to the electrical conductivity of the internal material of the sewer pipe. It is preferable to include a central processing unit for determining whether or not.

The central processing unit of the present invention calculates the impedance value through the current and voltage flowing through the internal material of the sewer pipe, and whether the impedance value corresponding to the electrical conductivity of the internal material of the sewer pipe is lower or higher than the expected impedance value. It is preferable to determine whether or not the sewage pipe through.

An electrical signal generator of the present invention comprises an oscillator for oscillating a signal at a predetermined time interval; A signal generator for generating a digital signal based on the signal oscillated by the oscillator; And a digital-analog signal converter for converting the digital signal generated by the signal generator into an analog signal such as a voltage; and a voltage-current converter for converting the voltage converted by the digital-analog signal converter into a current. Do.

The electric signal generator of the present invention preferably further includes an amplifier for amplifying the signal converted by the digital-analog signal converter.

The electric signal detecting apparatus of the present invention includes an analog-digital signal converter for converting a current generated by the electric signal generator into a digital signal, and a frequency measuring device for analyzing a frequency by the signal converted by the analog-digital signal converter. It is preferable to include.

The electric signal detecting apparatus of the present invention preferably further includes an amplifying filter which detects a current generated by the electric signal generating apparatus and amplifies only a predetermined frequency band and sends the same to the analog-digital signal converter.

False contact inspection method of the sewage pipe using the electrical conductivity of the present invention comprises the steps of sending an electrical signal to the internal material of the sewage pipe through the electrical signal generator; Detecting an electrical signal by the electrical signal generator; and calculating an impedance value by measuring current and voltage of the sewer pipe based on the detected electrical signal, and an impedance value corresponding to an electrical conductivity of an internal material of the sewer pipe is expected. It is preferable to determine whether or not the sewage pipe is inaccurate based on whether the impedance value is lower or higher.

The step of flowing the electrical signal of the present invention preferably comprises the step of supplementally flowing a fluid in the sewage pipe.

In the step of flowing the electric signal of the present invention, it is preferable to generate a voltage based on the oscillated signal at regular time intervals, and convert the generated voltage into a current and apply the same to the sewer pipe.

In the detecting of the electrical signal of the present invention, it is preferable to amplify only a predetermined frequency band from the detected current, convert the signal into a digital signal, and analyze the frequency characteristic by the digital signal.

According to the fault contact inspection system and inspection method of the sewage pipe using the electrical conductivity according to the present invention, it is possible to test the various fault contact forms by determining the fault contact by sending a current, there is an advantage that the inspection time is shortened.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the fault contact inspection system and inspection method of the sewage pipe using the electrical conductivity according to the present invention will be described in detail.

2 to 3 show a preferred embodiment of the fault contact inspection system and inspection method of the sewage pipe using the electrical conductivity according to the present invention.

Each object has its own specific resistivity, which is inversely related to the conductivity, which is a measure of how well the current flows through the material. The unit of electrical conductivity is Ωm in the MKS unit system.

In more detail about the conductivity, the rate at which electrons move through the material due to collisions with the surroundings does not continue to increase but remains within a constant value. The average value of these velocities is constant for each material and becomes a property of the material. That is, the average velocity of the electrons is proportional to the conductivity, and the resistivity, which is inversely related to the conductivity, has a constant value for each material.

On the other hand, the rainwater and sewage flowing in the sewage pipe corresponds to the electrolyte, so that it has a constant electrical conductivity can flow electricity. Therefore, the fault contact inspection system according to the present invention measures the impedance of the sewage pipe by measuring the impedance value according to the difference in the electrical conductivity characteristics of rainwater and sewage.

2 shows a miscontact inspection system according to the present invention. As shown, below the ground surface, a sewer pipe 10 for water treatment is embedded, and the sewer pipe 10 includes a rain pipe 11 for treating rainwater and a sewage pipe 13 for treating domestic wastewater.

One end of the sewer pipe 10 is provided with an electrical signal generator 20 for generating an electrical signal such as alternating current and applying an electrical signal to a material such as fluid and foreign matter flowing in the sewer pipe 10.

The electrical signal generator 20 is provided with an oscillator 21 such as an oscillator. The oscillator 21 is an element that oscillates a constant frequency by using an object such as a crystal and serves to generate an output signal at a predetermined time interval.

The electric signal generator 20 is provided with a digital signal generator 23. The signal generator 23 generates a digital signal based on the periodic signal change received from the oscillator 21.

The electrical signal generated by the signal generator 23 is converted into an analog signal such as a voltage by the digital-analog signal converter 25. The digital-analog signal converter 25 may be configured as a DA converter, and converts the digital signal generated by the signal generator 23 into an analog signal such as a voltage to measure an impedance value.

The voltage converted by the digital-analog signal converter 25 may be amplified to a constant magnitude in the amplifier 27. The amplifier 27 is an apparatus for increasing the energy of the input signal and outputting a large energy change on the output side. Since the amplitude of the signal generated by the signal generator 23 is small, it is transmitted to the amplifier 27. Amplified by

The voltage amplified by the amplifier 27 is converted into a current in the voltage-current converter 29. The V-I converter 29 serves to convert the voltage converted by the digital-to-analog signal converter 25 into a current in order to flow current into the sewer pipe 10.

If the digital-to-analog signal converter 25 can directly convert an electrical signal into a current, the voltage-to-current converter 29 can be omitted. The voltage-current transformer 29 may generate an alternating current of various frequency bands for convenience of inspection.

In addition, the other end of the sewage pipe in which the electric signal generator 20 is installed, the electric signal detection device 30 is installed. The electrical signal detection device 30 is generated by the electrical signal generator 20 serves to detect the alternating current flowing through the sewage pipe (10).

The electrical signal detection device 30 is provided with an amplifying filter 31. Since the alternating current flowing through the sewer pipe 10 has been transmitted from a distance, the size is also reduced and a lot of noise from the outside is mixed. Therefore, the amplification filter 31 amplifies the magnitude of the alternating current and removes noise other than the frequency portion to be measured.

The signal processed by the amplification filter 31 is converted into a digital signal by the analog-digital signal converter 33. The analog-digital signal converter 33 is configured as an AD converter, and converts the analog signal into a digital signal so that it can be processed by the central processing unit 40 to be described below.

The digital signal converted by the analog-digital signal converter 33 is processed by the frequency meter 35. The frequency measuring device 35 analyzes the frequency to be measured and obtains a voltage corresponding to the frequency signal applied by the electric signal generator 20.

The results analyzed by the frequency meter 35 are processed by the central processing unit 40. The CPU 40 obtains an impedance value from the voltage and current obtained by the frequency meter 35.

The relationship regarding the voltage V, the current I, and the impedance Z is as shown in Equation (1) below.

(1)

(One)

The relationship between the impedance Z, the resistance R, and the reactances X _L and X _C is expressed by Equation 2 below.

(2)

(2)

(X = X _L -X _C , X: total reactance)

On the other hand, the relationship between the resistance (R), the specific resistance (ρ) and the electrical conductivity (EC) is as shown in Equation (3) below.

(3)

(3)

(L: length, S: cross-sectional area)

Therefore, according to said formula (1), (2), and (3), following formula (4) can be obtained.

(4)

(4)

According to Equation (4), it can be seen that the impedance Z value is inversely proportional to the electrical conductivity EC. Therefore, the central processing unit 40 may determine the characteristic of the water flowing in the sewer pipe 10 by measuring the impedance value that changes according to the sewage pipe or the excellent electrical conductivity flowing through the sewer pipe 10.

The CPU 40 may be electrically connected to the electric signal generator 20 and the electric signal detector 30 to control the devices. In addition, the central processing unit 40 stores numerical values for electrical conductivity for sewage and rainwater, so that the results detected by the electrical signal detection device 30 can be compared.

That is, the central processing unit 40 predicts the impedance value corresponding to the electrical conductivity according to whether the water in the sewage pipe 10 to be inspected is the sewage or the excellent water in advance, and in the sewage pipe 10 It is possible to know whether the sewer pipe 10 is incorrectly compared with the measured impedance value.

In addition, the CPU 40 may output the detected result as a graph and a graph to approximately indicate the probability of the false contact.

Hereinafter, the inspection method of the fault contact inspection system of the sewage pipe using the electrical conductivity according to the present invention having the configuration as described above in detail.

First, the electric signal generator 20 and the electric signal detection device 30 are installed at one end and the other end of the sewage pipe 10 to be examined. In addition, the electrical signal generator 20 generates an electrical signal by the central processing unit 40.

In this case, when there is no water in the sewer pipe 10, an electric signal may be generated while additionally flowing water to generate an electrolyte through which current may flow.

The oscillator 21 of the electric signal generator 20 oscillates a signal at regular time intervals. The signal generator 23 generates a digital electric signal by the signal oscillated by the oscillator 21.

The electrical signal generated by the signal generator 23 is converted into a voltage by the digital-analog signal converter 25. Then, the voltage converted by the digital-analog signal converter 25 is amplified by the amplifier 27 and then converted by the voltage-current converter 29 into current.

The current converted by the voltage-to-current converter 29 flows through internal materials such as sewage and rainwater in the sewer pipe 10. The sewage pipe 13 of the sewage pipe 10 flows wastewater such as food waste, manure, and the like, and the wastewater has high salt and nutrient chlorination states, so that the ionization state is relatively high and the electrical conductivity is high.

On the contrary, since rainwater flows in the rainwater pipe 11 containing relatively less foreign matter, the ionization state is not high and the electrical conductivity is low.

The current flowing through the sewer pipe 10 is detected by the electrical signal detection device 30 provided at the other end of the sewer pipe 10. Only the frequency of the required portion of the current passing through the amplification filter 31 of the electrical signal detection device 30 is amplified to remove noise.

The current passing through the amplification filter 31 is converted into a digital signal by the analog-digital signal converter 33. The digital signal converted by the analog-digital signal converter 33 is analyzed by the frequency measuring device 35.

The results analyzed by the frequency meter 35 are processed by the central processing unit 40. The CPU 40 calculates impedance through voltage and current. The impedances calculated by the central processing unit 40 are different from each other depending on the characteristics of the water in the sewer pipe 10 through which current flows.

That is, when the measurement object is determined as an excellent pipe, the electrical conductivity in the rain pipe is constant at EC ₁ as shown in FIG. 4, and the electrical conductivity in the sewage pipe is constant at EC ₂ , more precisely, as mentioned above. However, the sewage in the sewage pipe has a high ionization state and thus has high electrical conductivity, so that the impedance value is lower than that of the rain pipe.

Therefore, when measuring the impedance of the rain pipe, a high impedance value corresponding to the electrical conductivity (EC ₁ ) of the rain water will be measured if the sewage pipe is not miscontacted. On the contrary, when the impedance of the rain pipe is measured, if the sewage pipe is erroneously contacted, the sewage may flow into the rainwater, resulting in an increased ionization state (EC ₃ ), thereby lowering the impedance value (EC ₃ ).

For example, the theoretical conductivity of pure water is 0.056 (μS / cm), and the water conductivity of water with the same level of ionization as the Han River is 100 to 200 (μS / cm). Therefore, the central processing unit 40 may probably determine whether the sewer pipe 10 is in contact with each other by an impedance value that varies according to the electrical conductivity of water flowing in the sewer pipe 10.

In the scope of the basic technical spirit of the present invention, many modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the claims which will be described later. .

According to the fault contact inspection system and inspection method of the sewage pipe using the electrical conductivity according to the present invention as described above has the following advantages.

First, the inspection process is not affected by the external environment such as the meteorological environment, and any contact form can be inspected as long as the current flows.

In addition, since only a current is supplied to the sewer pipe, the inspection is possible, thereby reducing the inspection time, thereby providing a rapid inspection.

Figure 1a is a schematic configuration diagram showing a sewage pipe malfunction inspection method according to the prior art.

Figure 1b is a schematic configuration diagram showing another embodiment of the sewage pipe inspection method according to the prior art.

Figure 2 is a cross-sectional view showing a preferred embodiment of the false contact inspection system and inspection method of the sewer pipe using the electrical conductivity according to the present invention.

Figure 3 is a block diagram of a fault contact inspection system and inspection method of the sewer pipe using the electrical conductivity according to the present invention.

Figure 4 is a state diagram showing the process of measuring the state of the sewage pipe is not erroneous using the inspection system and inspection method of the sewage pipe using the electrical conductivity according to the present invention.

5 is a measurement state diagram showing a process of measuring a state in which the sewage pipe is erroneous using the inspection system and inspection method of the sewage pipe using the electrical conductivity according to the present invention.

       * Description of the main parts of the drawings *

20: electric signal generator 21: oscillator

23: Signal Generator 25: Digital-to-Analog Signal Converter

27: amplifier 29: voltage-to-current converter

30: electric signal detection device 31: amplification filter

33: analog-to-digital signal converter 35: frequency meter

40: central processing unit

Claims (10)

An electrical signal generator for generating and applying an electrical signal to an internal material of the sewer pipe; An electrical signal detector for detecting an electrical signal generated by the electrical signal generator; and It includes a central processing unit for determining whether the sewage pipe is in error by calculating the impedance value corresponding to the electrical conductivity of the internal material of the sewage pipe through the electrical signal detected by the electrical signal detection device, The central processing unit The impedance value is calculated from the current and voltage flowing through the internal material of the sewer pipe, Determining whether the sewage pipe is inaccurate based on whether the impedance value corresponding to the electrical conductivity of the internal material of the sewer pipe is lower or higher than the expected impedance value. False contact inspection system of sewage pipe using electric conductivity. delete The method of claim 1, The electrical signal generator An oscillator for oscillating a signal at regular time intervals; A signal generator for generating a digital signal based on the signal oscillated by the oscillator; A digital-analog signal converter for converting a digital signal generated by the signal generator into an analog signal such as a voltage; and And a voltage-current converter for converting the voltage converted by the digital-analog signal converter into a current. False contact inspection system of sewage pipe using electric conductivity. The method of claim 3, The electrical signal generator And an amplifier for amplifying the signal converted by the digital-analog signal converter. False contact inspection system of sewage pipe using electric conductivity. The method of claim 1, The electrical signal detection device An analog-digital signal converter for converting a current generated by the electric signal generator into a digital signal; A frequency meter for analyzing a frequency by the signal converted by the analog-digital signal converter; False contact inspection system of sewage pipe using electric conductivity. The method of claim 5, The electrical signal detection device Amplifying filter for detecting the current generated by the electrical signal generator and amplifies only a predetermined frequency band and sends to the analog-to-digital signal converter; False contact inspection system of sewage pipe using electric conductivity. Sending an electric signal to an internal material of the sewer pipe through an electric signal generator; Detecting an electrical signal by the electrical signal generator; and By measuring the current and voltage of the sewer pipe by the detected electric signal, the impedance value is calculated, and whether or not the sewer pipe is misaligned through whether the impedance value corresponding to the electrical conductivity of the internal material of the sewer pipe is lower or higher than the expected impedance value. Judging Detecting the electrical signal Amplifies only a certain frequency band from the detected current and converts it into a digital signal, To analyze the frequency characteristics by the digital signal False contact inspection method of sewage pipe using electric conductivity. The method of claim 7, wherein The step of flowing the electrical signal Replenishing fluid into the sewer pipe False contact inspection method of sewage pipe using electric conductivity. The method of claim 7, wherein The step of flowing the electrical signal Generate a voltage based on the oscillated signal at regular time intervals, Converting the generated voltage into a current and applying to the sewer pipe False contact inspection method of sewage pipe using electric conductivity. delete

Images