KR102819989B1 - Cable type leakage detection sensor and remote monitoring system using the same - Google Patents

Abstract

The present invention relates to a cable-type leak detection sensor and a remote monitoring system using the same, and more particularly, to a cable-type leak detection sensor and a remote monitoring system using the same, in which a wire for leak sensing is manufactured by coating mass-produced high-quality graphene on the surface of the wire by a roll-to-roll method, and two wires are woven with PFA (PerFluoroalkoxy) having excellent chemical resistance and positioned side by side at a certain distance to manufacture a cable-type leak detection sensor, and in which the leak and the leak location detected by the cable-type leak detection sensor are wirelessly transmitted for monitoring.

Description

Cable type leakage detection sensor using mass-produced high-quality graphene and remote monitoring system using the same {Cable type leakage detection sensor and remote monitoring system using the same}

The present invention relates to a cable-type leak detection sensor and a remote monitoring system using the same, and more particularly, to a cable-type leak detection sensor and a remote monitoring system using the same, in which a wire for leak sensing is manufactured by coating mass-produced high-quality graphene on the surface of the wire by a roll-to-roll method, and two wires are woven with PFA (PerFluoroalkoxy) having excellent chemical resistance and positioned side by side at a certain distance to manufacture a cable-type leak detection sensor, and in which the leak and the leak location detected by the cable-type leak detection sensor are wirelessly transmitted for monitoring.

Korean Patent No. 10-2176168 (cable-type leakage detection sensor) proposes a cable-type leakage detection sensor for detecting leaking fluids such as water, acid solutions, alkaline solutions, oils, and organic solvents. As shown in FIG. 1, this structure comprises: a first detection line (10) for detecting leakage; a second detection line (20) for detecting leakage; a first fixing part (31) formed to be wound at intervals along the outer circumference of the first detection line (10) by a thread made of a material having chemical resistance or drug resistance; a second fixing part (32) formed to be wound at intervals along the outer circumference of the second detection line (20) by a thread made of a material having chemical resistance or drug resistance; It is composed of a connecting part (33) that is woven with a thread made of a chemical-resistant or pharmaceutical-resistant material to connect the first fixing part (31) and the second fixing part (32) on both sides so that the first detection line (10) and the second detection line (20) maintain a constant interval.

The first detection line (10) and the second detection line (20) configured in this manner are positioned side by side, and the first fixing part (31) and the second fixing part (32) are knitted so that Teflon thread is wound around the circumference of the first detection line (10) and the second detection line (20) at intervals, and the wound Teflon thread is formed at an interval (d) of about 0.1 to 1 mm from the threads wound in the longitudinal direction of the first detection line (10) or the second detection line (20).

Therefore, when a leakage of water, acid, alkali, oil, organic solvent, etc. occurs, it comes into contact with the first detection line (10) and the second detection line (20) through the gap (d), and thus the leakage is detected.

That is, in the case of the resistance method, changes in impedance due to leakage are detected, in the case of the conductivity method, leakage is detected due to changes in conductivity, and in the case of the capacitance method, conductive and non-conductive liquids can be detected by changes in capacitance.

In addition, after detection of a leaked solution, the leaked liquid can be removed through a cleaning operation, enabling repeated reuse.

However, this structure has a problem in that the first detection line (10) and the second detection line (20) are formed of a metal material, such as stainless steel, and are easily corroded by chemical solutions such as acids. This corrosion not only prevents accurate leakage detection, but also makes reuse difficult and greatly shortens the lifespan.

In addition, since the gap (d) between the Teflon threads that are wound around the outside of the first detection line (10) and the second detection line (20) to form the first fixing part (31) and the second fixing part (32) is very dense, at about 0.1 to 1 mm, if foreign substances such as dust or dirt get caught in the gap (d), the detection performance of the leaked solution may be significantly reduced or may cause a detection error.

<Prior art literature>

1. Republic of Korea registered patent no. 10-2176168

(Cable type leak detection sensor)

In order to solve these conventional problems, the purpose of the present invention is to provide a cable-type leakage detection sensor in which the outer side of a metal wire forming a sensing line is coated with graphene having conductivity and high acid resistance, and a fixing part is braided so that the exposed area of the sensing line is large, thereby greatly improving the sensing performance.

Another object of the present invention is to provide a cable-type leakage detection device in which the detection line and the fixing part are braided together to increase the exposure of the detection line and to facilitate manufacturing.

Another object of the present invention is to manufacture graphene coated on the outer surface of a wire in high quality and large quantities, thereby enabling accurate leakage detection and detection of the location of the leakage while reducing the manufacturing cost.

In order to achieve the above purpose, the cable-type leakage detection sensor according to the present invention is

A first sensing line for detecting leakage;

A second sensing line for detecting leakage;

A first fixing member is braided at intervals along the outer circumference of the first sensing line by a thread made of a material having chemical resistance or drug resistance;

A second fixing member is braided at intervals along the outer circumference of the second sensing line by a thread made of a material having chemical resistance or drug resistance;

A connecting portion is included, which is braided between the first fixing portion and the second fixing portion by a thread made of a material having chemical resistance or drug resistance, and connects the first fixing portion and the second fixing portion on both sides;

The first fixing part and the second fixing part are knitted with the same density as the connecting part and with a gap in the longitudinal direction to form an exposed portion where the first sensing line and the second sensing line are exposed to the outside, and the exposed portion is formed to be the same length as or longer than the longitudinal length of the first fixing part and the second fixing part, and the outer surfaces of the first and second sensing lines are coated with an electrode composition including graphene.

As another form of the above leakage detection sensor,

A first sensing line for detecting leakage;

A second sensing line for detecting leakage;

A first fixing member is braided at intervals along the outer circumference of the first sensing line by a thread made of a material having chemical resistance or drug resistance;

A second fixing member is braided at intervals along the outer circumference of the second sensing line by a thread made of a material having chemical resistance or drug resistance;

A connecting portion is included, which is braided between the first fixing portion and the second fixing portion by a thread made of a material having chemical resistance or drug resistance, and connects the first fixing portion and the second fixing portion on both sides;

The above first sensing line and the second sensing line are characterized in that they are configured by being braided together when the first fixing part and the second fixing part are braided, respectively, and an electrode composition including graphene is coated on the outer surfaces of the first and second sensing lines.

In addition, the above graphene

A first step of mixing a solution containing a solvent and graphite by using a homomixer and a resonant mixer for premixing and generating shear force;

A second step of exfoliating graphene by dispersing the above mixed solution using a high-pressure disperser;

A third step of extracting a graphene dispersion by putting the solution from which the graphene has been exfoliated into a centrifuge to separate unreacted graphite;

A fourth step of washing and precipitating the graphene by aqueous substitution of the above graphene dispersion, and then concentrating the graphene in a concentrator;

The fifth step is to powderize the concentrated graphene by freeze-drying to remove the solvent;

It is characterized by being manufactured by a sixth process of drying the freeze-dried graphene at high temperature.

In addition, the solvent is characterized by containing sodium hydroxide (NaOH) and naphthalene to improve the dispersibility of graphene.

In addition, the above concentrator

A tube is formed, one side receives a graphene dispersion with pressure from a pump, and the other side is a ceramic filter in a blocked state;

It is characterized by comprising: an outer jacket installed to surround the outer periphery of the ceramic filter and circulating the graphene dispersion passing through the ceramic filter by a pump;

In addition, a remote monitoring system using a cable-type leak detection sensor,

The connector of the above cable-type leakage detection sensor is connected by a wire to a field controller installed in the vicinity of where the leakage detection sensor is installed, and the field controller is configured to check whether there is a leakage by a leakage detection signal received from the leakage detection sensor and to determine the location of the leakage based on the size of the resistance value and transmit the result to a remote integrated control panel via a wireless communication network.

A mass-produced high-quality graphene-based cable-type leak detection sensor and a remote monitoring system using the same according to the present invention have the advantage of preventing corrosion by coating the outside of a metal wire forming a detection line with graphene to provide acid resistance, thereby enabling accurate leak detection and enabling reuse, as well as extending the service life.

In addition, there is an advantage in that the fixing part is braided to increase the exposed area of the sensing line formed with the graphene-coated wire, thereby greatly improving the sensing performance.

In addition, by enabling the production of high-quality and large-scale graphene coated on the outer surface of the wire forming the sensing line, it has the advantage of being able to detect not only the leak but also the location of the leak, while also significantly reducing the manufacturing cost.

Figure 1 is a diagram showing the structure of a conventional cable-type leakage detection sensor.
Figure 2 is a diagram showing the structure of a cable-type leakage detection device according to the first embodiment of the present invention.
Figure 3 is a diagram showing the structure of a cable-type leakage detection device according to a second embodiment of the present invention.
Figure 4 is a diagram showing the structure of a graphene concentration device according to the present invention.
Figure 5 is a cross-sectional structural diagram of a concentrator.
Figure 6 is a diagram showing the structure of a remote monitoring device.

The above-mentioned objects, features and advantages are described in detail below with reference to the attached drawings, so that a person having ordinary knowledge in the technical field to which the present invention pertains can easily practice the technical idea of the present invention.

In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

The terms used in the present invention are selected from the most widely used general terms possible while considering the functions of the present invention, but these may vary depending on the intention of engineers working in the field, precedents, the emergence of new technologies, etc.

Additionally, in certain cases, there are terms arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the description of the relevant invention.

Therefore, the terms used in the present invention should be defined based on the meaning of the terms and the overall content of the present invention, rather than simply the names of the terms.

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

However, the embodiments of the present invention exemplified below may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

The embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

FIG. 2 is a diagram showing the structure of a cable-type leakage detection device according to the first embodiment of the present invention. Since the structures of the first detection line (100), the second detection line (200), and the connection part (330) are the same as those of the prior art, the structure of the first fixing part (310) and the second fixing part (320) will be mainly described.

The first fixing part (310) and the second fixing part (320) which are braided with Teflon thread such as PFA (PerFluoroalkoxy) are braided together to wrap around the outer sides of the first sensing line (100) and the second sensing line (200) and are braided together when the connecting part (330) is braided. At this time, the first fixing part (310) and the second fixing part (320) are braided together with the connecting part (330) while having the same high density.

When the first fixing part (310) and the second fixing part (320) are braided, the high-density braided parts are braided with intervals in the longitudinal direction, thereby forming exposed parts (400, 410) so that the first sensing line (100) and the second sensing line (200) are exposed, respectively. These exposed parts are formed to be the same length as or longer than the first fixing part (310) and the second fixing part (320).

That is, by forming the exposed portion (400, 410) to be equal to or longer than the length of the first fixing portion (310) and the second fixing portion (320), the first fixing portion (310) and the second fixing portion (320) are fixed by maintaining the gap between the first detection line (100) and the second detection line (200) by the connecting portion (330), while maximizing the exposed portion.

The length of the first fixing part (310) and the second fixing part (320) is about 0.5 to 1 cm, and the length of the exposed part (400, 410) can be formed to have a length of 0.8 to 1.5 cm.

As a result, the first detection line (100) is exposed to the second detection line (200) more due to the exposure area (400) formed between the gap of the first fixing part (310) and the exposure area (410) formed between the gap of the second fixing part (320), thereby improving detection performance and also significantly improving detection errors by preventing foreign substances from easily getting caught.

FIG. 3 is a third embodiment of the present invention, which has a structure in which the first detection line (100) and the second detection line (200) are braided together when the first fixing part (310) and the second fixing part (320) are braided.

This structure is easier to manufacture than the conventional technology and the first embodiment of the present invention, and thus has excellent productivity. In the conventional technology and the first embodiment of the present invention, the fixing portion (210, 320) is braided to surround the outside of the sensing line (100, 200), so precise braiding must be achieved, and furthermore, the needle may damage the sensing line (100, 200) during braiding. However, in the second embodiment of the present invention, the sensing line (100, 200) is braided together with the fixing portion (310, 320), so not only is the sensing line (100, 200) not damaged, but the defective rate is also lowered, so productivity is greatly improved, which is an advantage.

To this end, by first braiding the fixed portion (310, 320) using a thread made of a chemical-resistant or chemical-resistant material, such as Teflon thread, and a sensing wire (100, 200) made of stainless steel wire, and then braiding the connecting portion (330), the fixed portion (310, 320) can be fixed while maintaining a gap with the sensing wire (100, 200).

Meanwhile, the first detection line (100) and the second detection line (200) are used as electrodes by coating the outer surface of a wire made of stainless steel with graphene, thereby providing chemical resistance and drug resistance.

To this end, it is desirable to manufacture the graphene in large quantities while maintaining high quality, thereby improving the accuracy of leak detection and reducing manufacturing costs. To this end, the process for manufacturing graphene is described.

In order to mass-produce high-quality graphene, graphene is exfoliated from graphite by high-pressure dispersion. To exfoliate graphene, a fluid containing graphene is rotated to form a Taylor fluid, and graphene is exfoliated from the graphite by the shear force generated by the Taylor flow.

At this time, the shear force applied to the graphite must be sufficient to overcome the strong van der Waals attraction between each graphene layer of the graphite.

To manufacture graphene, graphite is first mixed with an organic solvent, NMP (N-methyl-2-pyrrolidinone) or DMF (N,N-dimethylformamide). NMP and DMF have the characteristic of having surface energy similar to that of graphene.

Here, 90 to 99.9 parts by weight of graphite and 0.1 to 10 parts by weight of solvent are mixed.

In addition, the fluid may further include a dispersant to improve the graphene exfoliation efficiency. As the dispersant, sodium hydroxide (NaOH) and naphthalene are mixed, and 1 to 150 parts by weight of the graphite may be mixed with this dispersant.

The fluid thus mixed is mixed using a homo mixer and a centrifugal mixer for premixing and shear force generation. In the case of a homo mixer, mixing is performed at 4,000 to 8,000 rpm for 1 hour, and then mixing is performed using a centrifugal mixer at 200 to 600 rpm for 1 to 10 minutes.

Therefore, as the graphite, solvent, and dispersant are mixed by the rotational force of the homomixer and the resonant mixer, the shear force increases significantly, generating a strong shear force that can overcome the van der Waals attraction between each graphene layer of the graphite.

The fluid mixed in this way by the homomixer and the resonant mixer is fed into a high-pressure disperser, where graphene is exfoliated from the graphite. The high-pressure disperser operates under the conditions of 100 to 1,000 bar and 5 to 40 passes.

At this time, if the pressure of the high-pressure disperser is too high, the graphene may be damaged, such as torn, as it is peeled off, significantly reducing the quality. Therefore, it is desirable to select a pressure that allows sufficient peeling without causing damage, and it is desirable that the pressure be set to 100 to 1,000 bar and 5 to 40 passes.

Additionally, the graphene dispersibility is greatly improved by sodium hydroxide (NaOH) and naphthalene added to the fluid.

The fluid in which graphene is dispersed in this way can be separated into graphene, graphite, and solvent with a number of layers less than about 10 (i.e., 1 to 9 layers) by using a centrifuge. At this time, the centrifuge is operated at 500 to 1,500 rpm for 30 to 60 minutes to separate the unreacted raw material, graphite, and the separated graphite can be reintroduced when forming a fluid.

Graphene dispersion, which is a mixture of dispersed graphene and solvent, i.e., a fluid from which graphite is separated, goes through a solvent washing and graphene concentration process to increase the efficiency of the freeze-drying process of graphene. This solvent washing process replaces the graphene dispersed in the organic solvent with a water base.

To perform this solvent washing process, 0.1 to 1 mol of hydrochloric acid is mixed with organic solvents such as NMP or DMF to perform aqueous substitution, and then graphene is precipitated. The precipitation process can be carried out by natural precipitation or by a centrifuge.

The graphene thus washed and precipitated is concentrated in a concentrator to remove the solvent and thereby have a low moisture content, and also enables rapid drying due to the low moisture content during freeze-drying.

In order to concentrate graphene, a concentration device such as that shown in FIG. 4 is used. A tank (500) is provided to receive a fluid containing a mixture of dispersed graphene, graphite, and a solvent, a concentrator (700) is installed, and a pump (600) pumps the fluid from the tank (500) and injects it into the concentrator (700) while under pressure.

Accordingly, the graphene dispersed in the fluid introduced under pressure into the concentrator (700) is filtered out and accumulated, thereby being concentrated, and the graphite and solvent are again introduced into the tank (500) and circulated through the above process again, thereby filtering out the dispersed graphene contained in the fluid and concentrating it all.

As shown in Fig. 5, this concentrator (700) is formed as a tube with microporous structures and has a ceramic filter (720) in a closed state on the other side, and an outer jacket (710) is placed on the outside of the ceramic filter (720), and a space is formed between the outside of the ceramic filter (720) and the inside of the outer jacket (710), and the other side of the outer jacket (710) is connected to a tank (500) through a pipe.

Additionally, a graphene dispersion liquid under pressure is injected from a tank (500) through a pump (600) into one side of the ceramic filter (720).

Accordingly, the graphene dispersion liquid injected into the inside of the ceramic filter (720) under pressure accumulates only the graphene dispersed through the micropores on the inside, and the graphite and solvent penetrate to the outside of the ceramic filter (720) and are discharged to the inside of the outer jacket (710), thereby being circulated to the tank (500).

Therefore, by repeating this cyclic process, graphene is accumulated and concentrated on the inside of the ceramic filter (720).

Since graphene particles typically have a size of 0.8 to 8 μm, it is desirable for the micropores to have a size, for example, a size in the nm unit, that filters out the dispersed graphene and allows only graphite and solvent to pass through.

When concentration is completed in the concentrator (700), the reverse pressure valve (800) is opened to apply reverse pressure from the outside to the inside of the ceramic filter (720), thereby allowing the concentrated graphene to easily separate from the inside of the ceramic filter (720).

The graphene washed and concentrated through the above-described concentration process is freeze-dried. Although the solvent is removed during the concentration process, it contains a small amount of solvent and thus has a relatively low moisture content.

Therefore, the graphene is made to have an extremely low moisture content by freeze-drying or the solvent is completely removed, and freeze-drying is performed at a temperature of -40°C for more than 36 hours.

After the freeze-drying is completed and the solvent is removed, the graphene is naturally powdered, and the powdered graphene powder obtained is pulverized and classified using a planetary mill and an ultrasonic sieve to homogenize it.

Furthermore, by performing high-temperature drying at 40 to 50°C for less than 3 hours on the freeze-dried and powdered graphene or the homogenized graphene powder that has been pulverized and classified by a planetary mill and an ultrasonic sieve, homogenized graphene can be finally manufactured.

The graphene thus manufactured is coated on the outer surface of the wire with a uniform thickness by a roll-to-roll method. The technology for coating by this roll-to-roll method is a general technology, and known technologies such as those disclosed in Patent No. 10-1371286 (graphene roll-to-roll coating device) can be used.

Meanwhile, a monitoring system is being built that not only wirelessly transmits a leak detection signal to a remote location using the leak detection sensor manufactured in this way, but also calculates the location of the leak so that immediate measures can be taken when a leak occurs.

The outer surface of the detection line (100, 200) of the leakage detection sensor is coated with graphene in a roll-to-roll manner, and since this graphene has a high quality, that is, uniform resistance value, it is possible to detect not only the leakage status but also the leakage location by changes in the resistance value.

Since cable-type leak detection sensors are usually installed with a length of several to tens of meters, or even hundreds of meters, it is very important to quickly and accurately detect the location of a leak so that immediate action can be taken.

Accordingly, when a leak occurs, the first detection line (100) and the second detection line (200) are short-circuited due to the leak, and the leakage condition can be determined by changing the resistance value due to this short-circuit, and also, the location where the leak occurred can be confirmed by the size of the resistance value.

That is, since high-quality graphene having a uniform unit resistance value is coated with a uniform thickness on the surfaces of the first detection line (100) and the second detection line (200), when a leak occurs, the leakage location value accurately shows the change in resistance value. For example, when a leak occurs at a location close to a connector (2) connected to a cable-type leakage detection sensor (1) as in Fig. 6, the resistance value will be low, and at a distant location, a leakage detection signal will be generated with a relatively high resistance value.

Accordingly, the field controller (900) connected to the connector (2) by wire calculates the leakage as well as the leakage location according to the change in the resistance value of the leakage detection signal. Since the distance information value according to the resistance value is already stored in the field controller (900), the distance information value corresponding to the resistance value input from the connector (2) is read and transmitted to the remote control panel (1000) via a wireless network through the gateway.

Therefore, the remote control panel (1000) generates an alarm signal according to the leakage and transmits it to the field controller (900) to generate an alarm, and likewise, the remote control panel (1000) itself generates an alarm to notify that a leakage has occurred and simultaneously display the location where the leakage has occurred.

That is, the remote control panel (1000) maps the distance information value transmitted from the field controller (900) to the location data of the installed leak detection sensor (1) and displays the leak location information in various user interfaces, for example, by displaying the leak location on a field map or displaying the leak area in letters, so that the worker can accurately and quickly determine the leak location.

The above wireless transmission could be a short-range communication network such as a mobile network, LoRa, Zigbee, or Bluetooth.

This allows workers to quickly get to the scene of a leak and take action.

While specific portions of the present invention have been described in detail above, it will be apparent to those skilled in the art that such specific descriptions are merely preferred embodiments and that the scope of the present invention is not limited thereby.

Accordingly, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

1: Leakage detection sensor
2 : Connector
100,200 : Detection line
310,320 : Fixed part
330 : Connection
400,410 : Exposed area
500 : Tank
600 : Pump
700 : Concentrator
710 : Outer jacket
720 : Ceramic Filter
800 : Reverse pressure valve
900 : Field controller
1000 : Remote control panel

Claims (7)

A first sensing line for detecting leakage;
A second sensing line for detecting leakage;
A first fixing member is braided at intervals along the outer circumference of the first sensing line by a thread made of a material having chemical resistance or drug resistance;
A second fixing member is braided at intervals along the outer circumference of the second sensing line by a thread made of a material having chemical resistance or drug resistance;
A connecting portion is included, which is braided between the first fixing portion and the second fixing portion by a thread made of a material having chemical resistance or drug resistance, and connects the first fixing portion and the second fixing portion on both sides;
The first fixing part and the second fixing part are knitted with the same density as the connecting part and with a gap in the longitudinal direction to form an exposed portion where the first sensing line and the second sensing line are exposed to the outside, and the exposed portion is formed to be the same length as or longer than the longitudinal length of the first fixing part and the second fixing part, and the outer surfaces of the first and second sensing lines are coated with an electrode composition including graphene.
The above graphene is
A first step of mixing a solution containing a solvent and graphite by using a homomixer and a resonant mixer for premixing and generating shear force;
A second step of exfoliating graphene by dispersing the above mixed solution using a high-pressure disperser;
A third step of extracting a graphene dispersion by putting the solution from which the graphene has been exfoliated into a centrifuge to separate unreacted graphite;
A fourth step of washing and precipitating the graphene by replacing the above graphene dispersion with water, and then concentrating the graphene in a concentration device;
The fifth step is to freeze-dry the concentrated graphene to remove the solvent and turn it into powder;
The above concentration equipment
A tank containing a fluid mixture of dispersed graphene, graphite, and solvent;
A concentrator for concentrating the above graphene;
It consists of a pump that pumps fluid from the above tank and injects it into the concentrator in a pressurized state;
The above concentrator
A tube is formed with nanometer-sized micropores to allow only graphite and solvent to pass through, and a graphene dispersion with pressure from a pump is injected into the tube through one side, while the other side is a ceramic filter in a closed state;
It is composed of an outer jacket which is installed while wrapping around the outer perimeter of the ceramic filter, a space is formed between the outer and inner sides of the ceramic filter, and circulates the graphite and solvent passing through the ceramic filter to the pump;
The graphene dispersed on the inside of the above ceramic filter is configured to accumulate and concentrate,
A cable-type leak detection sensor characterized in that the above-mentioned concentration device includes a reverse pressure valve that opens when concentration is completed in the above-mentioned concentrator and applies reverse pressure from the outside to the inside of the ceramic filter so that the concentrated graphene escapes to the inside of the ceramic filter.
A first sensing line for detecting leakage;
A second sensing line for detecting leakage;
A first fixing member is braided at intervals along the outer circumference of the first sensing line by a thread made of a material having chemical resistance or drug resistance;
A second fixing member is braided at intervals along the outer circumference of the second sensing line by a thread made of a material having chemical resistance or drug resistance;
A connecting portion is included, which is braided between the first fixing portion and the second fixing portion by a thread made of a material having chemical resistance or drug resistance, and connects the first fixing portion and the second fixing portion on both sides;
The first and second sensing lines are configured by being braided together when the first and second fixing parts are braided, respectively, and an electrode composition including graphene is coated on the outer surfaces of the first and second sensing lines.
The above graphene is
A first step of mixing a solution containing a solvent and graphite by using a homomixer and a resonant mixer for premixing and generating shear force;
A second step of exfoliating graphene by dispersing the above mixed solution using a high-pressure disperser;
A third step of extracting a graphene dispersion by putting the solution from which the graphene has been exfoliated into a centrifuge to separate unreacted graphite;
A fourth step of washing and precipitating the graphene by replacing the above graphene dispersion with water, and then concentrating the graphene in a concentration device;
The fifth step is to freeze-dry the concentrated graphene to remove the solvent and turn it into powder;
The above concentration equipment
A tank containing a fluid mixture of dispersed graphene, graphite, and solvent;
A concentrator for concentrating the above graphene;
It consists of a pump that pumps fluid from the above tank and injects it into the concentrator in a pressurized state;
The above concentrator
A tube is formed with nanometer-sized micropores to allow only graphite and solvent to pass through, and a graphene dispersion with pressure from a pump is injected into the tube through one side, while the other side is a ceramic filter in a closed state;
It is composed of an outer jacket which is installed while wrapping around the outer perimeter of the ceramic filter, a space is formed between the outer and inner sides of the ceramic filter, and circulates the graphite and solvent passing through the ceramic filter to the pump;
The graphene dispersed on the inside of the above ceramic filter is configured to accumulate and concentrate,
A cable-type leak detection sensor characterized in that the above-mentioned concentration device includes a reverse pressure valve that opens when concentration is completed in the above-mentioned concentrator and applies reverse pressure from the outside to the inside of the ceramic filter so that the concentrated graphene escapes to the inside of the ceramic filter.
delete A cable-type leak detection sensor according to any one of claims 1 and 2, characterized in that the solvent contains a mixture of sodium hydroxide (NaOH) and naphthalene to improve the dispersibility of graphene.
A cable-type leak detection sensor characterized in that it is manufactured by including a sixth process of drying the freeze-dried graphene at a high temperature according to any one of claims 1 and 2. delete delete