KR102485926B1 - Apparatus for Cleaning Pipe and Method for Cleaning Pipe Using the Same - Google Patents

Abstract

Disclosed are an apparatus for cleaning a pipe and a method for cleaning a pipe using the same. The apparatus for cleaning a pipe according to an aspect of the present invention comprises: a front surface casing inserted into a pipe to be cleaned and formed in a shape corresponding to the shape of the inner circumference surface of the pipe; a rear surface casing arranged inside the pipe with a constant gap from the front surface casing, formed in a shape corresponding to the shape of the inner circumference surface of the pipe and forming a cleaning space between the front surface casing and the rear surface casing; a rotating flow forming part for forming a rotating flow by rotating fluid inside the cleaning space along the inner circumference surface of the pipe; and a cleaning ball arranged in the cleaning space and removing scale by colliding with the scale formed on the inner circumference surface of the pipe while being rotated along the inner circumference surface of the pipe by the rotating flow generated in the cleaning space by the rotating flow forming part. Therefore, provided are an apparatus for cleaning a pipe and a method for cleaning a pipe using the same, wherein scale inside a pipe can be removed safely and conveniently.

Description

Pipe cleaning device and pipe cleaning method using the same {Apparatus for Cleaning Pipe and Method for Cleaning Pipe Using the Same}

The present invention relates to a pipe cleaning device and a pipe cleaning method using the same, and more particularly, to a pipe cleaning device for removing foreign substances such as scale inside a pipe of a previously installed water supply pipe and a pipe cleaning method using the same.

A water supply pipe or a sewage pipe is a conduit for supplying water supply or draining sewage by being buried in a building interior wall or underground, and is made of a hollow cylindrical shape and may be made of a material such as steel, concrete, or synthetic resin.

Among these conduits, especially water supply pipes, various foreign substances such as lime, rust, or bacteria may be deposited and fixed on the inner wall of the pipe when used for a long time.

This deposit is called scale (Scale: 20), and the scale 20, as shown in FIG. 1, is deposited around the inner circumference of the pipe 10, and when it is fixed over time, it hardens very hard and is difficult to remove .

On the other hand, when a large amount of the scale 20 is stacked, the passage inside the conduit 10 narrows and the flow rate becomes insufficient, while flow loss becomes severe due to friction between the scale and a fluid such as tap water flowing on the inner circumferential surface of the conduit. There are problems such as poor hygiene in the area, so it needs to be removed.

However, if a chain or the like is forcibly struck to remove hardened scale, excessive impact is applied to the pipeline, which may cause cracks or perforations to occur due to damage to the pipeline.

Registered Patent No. 10-0805853

The present invention is to solve the above problems, and an object of the present invention is to provide a pipe cleaning device capable of safely and conveniently removing scale inside a pipe and a pipe cleaning method using the same.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

According to one aspect of the present invention, the front casing is inserted into the pipe to be cleaned and has a shape corresponding to the inner circumferential shape of the pipe; a rear casing disposed inside the pipe at a predetermined distance from the front casing and having a shape corresponding to an inner circumferential shape of the pipe to form a washing space between the rear casing and the front casing; a rotating flow forming unit configured to rotate the fluid inside the washing space along an inner circumferential surface of the pipe to form a rotating flow; Washing balls disposed in the washing space and rotating around the inner circumferential surface of the pipe by the rotary flow generated by the rotary flow forming unit in the washing space collide with the scale formed around the inner circumferential surface of the pipe to remove the scale. There is provided a pipe cleaning device comprising a;

The rotary flow forming unit may be provided to inject fluid into the washing space and rotate the injected fluid to form a rotary flow.

The fluid introduced through the rotary flow forming unit may be at least one of air, nitrogen, and water.

The rotating flow forming unit, a pressure generating unit for sending the fluid at a high pressure; a fluid transfer pipe for guiding the fluid sent from the pressure generating unit to the front and rear casings; Rotating flow forming nozzles are formed on surfaces of the front casing and the rear casing facing the washing space to discharge the fluid supplied from the fluid transfer pipe to form a rotating flow.

The rotary flow forming nozzle may include a plurality of first nozzles disposed in a first region near the rim of surfaces of the front casing and the rear casing facing the washing space to discharge fluid in a direction normal to the inner circumferential surface of the pipe; It is disposed in the second area located at the center of the first area on the surface of the front casing and the rear casing facing the washing space, and directs the fluid toward the direction rotated by the first nozzle and the outside of the radius of the pipe. It may include; second nozzles disposed in plurality to discharge in a direction in which directions are combined.

The front casing and the rear casing may be formed to have a smaller size than the inner circumferential surface of the pipe.

It is formed around the front casing and the rear casing, and fills the gap between the front casing and the rear casing and the inner circumferential surface of the pipe or the scale on the inner circumferential surface of the pipe, and discharges the fluid while not discharging the cleaning ball, and the pipe A skirt portion formed of a flexible material that can be deformed according to the shape of the inner circumferential surface or the shape of the scale; may further include.

The skirt portion may include a brush formed of an elastic material.

It may further include a forward movement unit for advancing the front casing, the rear casing, and the rotary flow forming unit inside the pipe by using the pressure of the fluid generated by the pressure generating unit.

The forward movement part is disposed on a surface opposite to the surface of the rear casing facing the washing space, and injects the fluid moved through the fluid movement pipe to the rear side of the rear casing as a reaction to the front casing; It may be provided to advance the rear casing and the rotary flow forming part.

It may further include a branch valve provided in the fluid movement pipe to adjust the amount or pressure of the fluid supplied to the forward movement unit.

On the other hand, in the pipe cleaning method for cleaning the inner circumferential surface of the pipe through the pipe cleaning device described above, the insertion step of inserting and positioning the pipe cleaning device into the inner circumferential surface of the pipe; After the inserting step, a peeling step of forming a rotational flow inside the washing space of the pipe cleaning device so that the washing ball repeatedly collides with the scale formed on the inner circumferential surface of the pipe to peel the scale; After the peeling step, there is provided a pipe cleaning method comprising a moving step of moving the pipe cleaning device forward.

The peeling step may be repeatedly performed after each moving step.

a disassembly step of taking out the pipe cleaning device from the inside of the pipe after the cleaning of the inner circumferential surface of the pipe using the pipe cleaning device is finished; After the stripping step, a purge step of washing the exfoliated scale accumulated on the inner circumferential surface of the pipe may be further included.

According to the above configuration, the pipe cleaning device and the pipe cleaning method using the same according to the present invention have an effect of removing scale deposited and adhered to the inner circumferential surface of the pipe while minimizing damage to the pipe.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a view showing a conduit in which scales are formed on an inner circumferential surface.
Figure 2 is a perspective view showing a pipe cleaning device according to an embodiment of the present invention.
3 is a cross-sectional view of a pipe cleaning device according to an embodiment of the present invention.
4 is a view showing various types of washing balls according to an embodiment of the present invention.
5 is a view showing rotation flow forming units formed on the front casing and the rear casing of the pipe cleaning apparatus according to an embodiment of the present invention.
FIG. 6 is a view showing a state in which scales are removed from an inner circumferential surface of a pipe while a washing ball of the pipe cleaning apparatus according to an embodiment of the present invention is rotated.
7 is a view showing a skirt portion of a pipe cleaning device according to an embodiment of the present invention.
8 is a flowchart illustrating a pipe cleaning method using a pipe cleaning device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein. In order to clearly describe the present invention, parts irrelevant to the description are omitted in the drawings, and the same reference numerals are assigned to the same or similar components throughout the specification.

Words and terms used in this specification and claims are not construed as limited in their ordinary or dictionary meanings, but in accordance with the principle that the inventors can define terms and concepts in order to best describe their inventions. It should be interpreted as a meaning and concept that corresponds to the technical idea.

Therefore, the embodiments described in this specification and the configurations shown in the drawings correspond to a preferred embodiment of the present invention, and do not represent all the technical ideas of the present invention, so that the corresponding configurations are various to replace them at the time of filing of the present invention. There may be equivalents and variations.

In this specification, terms such as "include" or "have" are intended to describe the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

A component being in the "front", "rear", "above" or "below" of another component means that it is in direct contact with another component, unless there are special circumstances, and is "in front", "rear", "above" or "below". It includes not only those disposed at the lower part, but also cases in which another component is disposed in the middle. In addition, the fact that certain components are “connected” to other components includes cases where they are not only directly connected to each other but also indirectly connected to each other unless there are special circumstances.

Hereinafter, a pipe cleaning apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.

1 is a view showing a pipe line having scales 20 formed on an inner circumferential surface, and FIG. 2 is a perspective view showing a pipe cleaning device 100 according to an embodiment of the present invention.

As shown in FIGS. 1 and 2 , the pipeline cleaning apparatus 100 according to the present embodiment includes a front casing 110, a rear casing 120, a rotary flow forming unit 130, and a cleaning ball 150. can do.

The front casing 110 is inserted inside the pipe 10 to be cleaned, and may be formed in a shape corresponding to the inner circumferential surface of the pipe 10 .

In this embodiment, the pipe cleaning device 100 is taken as an example to clean the inside of the water supply pipe. In general, since the water pipe pipe 10 uses a circular hollow pipe 10, the front casing ( 110) In addition, a case having a circular cross section will be described as an example.

Of course, the pipe cleaning device 100 of the present invention can be applied anywhere as long as it is for cleaning the inside of not only water supply pipes but also sewage pipes or pipes 10 for transporting other fluids. In addition, the present embodiment is described by taking as an example that the cross section of the inner circumferential surface of the pipe 10 is circular, but the present invention is not limited to the sectional shape of the inner circumferential surface of the pipe 10, and the cross section of the inner circumferential surface of various shapes such as square, elliptical, and polygonal. It can also be applied to shapes.

The front casing 110 is formed to have a cross-sectional shape corresponding to the cross-sectional shape of the inner circumferential surface of the pipe 10. At this time, the front casing 110 is a scale formed on the inner circumferential surface of the pipe 10 ( 20) may be formed to have a diameter slightly smaller than the diameter of the inner circumferential surface of the pipe 10 in consideration of the thickness of the pipe 10.

Similar to the aforementioned front casing 110, the rear casing 120 has a cross-sectional shape corresponding to the cross-sectional shape of the inner circumferential surface of the pipe 10, and is formed with a diameter slightly smaller than the diameter of the inner circumferential surface of the pipe 10. It may be disposed inside the pipe 10 and spaced apart from the front casing 110 at a predetermined interval to form a washing space between the front casing 110 and the front casing 110 .

The washing space is a space between the front casing 110 and the rear casing 120, and is a space in which the scale 20 is removed by the washing balls 150 described later.

Meanwhile, the rotary flow forming unit 130 is provided to rotate the fluid inside the washing space along the inner circumferential surface of the pipe 10 to form a rotary flow.

The fluid inside the cleaning space may be a gas such as air or nitrogen, or a liquid in which water or separate cleaning chemicals are mixed, or a mixture of a plurality of types among air, nitrogen, water, and cleaning chemicals.

That is, the rotary flow generator 130 may generate a rotary flow that rotates along the inner circumferential surface of the pipe 10 by simultaneously supplying the fluid to the inside of the washing space and rotating the supplied fluid.

The washing ball 150 is disposed in the washing space and is rotated around the inner circumferential surface of the pipe 10 by the rotary flow generated by the rotary flow forming unit 130 in the washing space. The scale 20 may be removed by colliding with the scale 20 formed around the inner circumferential surface.

As shown in a of FIG. 4, the washing balls 150 are in the shape of a constellation in which a plurality of spikes are formed on a spherical surface, or in the shape of a cuboid or diamond as shown in b and c of FIGS. Alternatively, as shown in d of FIG. 4, it may take various forms such as a form in which a plurality of disks intersect based on a central point. At this time, chisels or teeth 153 may be formed on the rim of the disc to better remove the scale 20.

The washing ball 150 is made of a material such as metal, ceramic, or synthetic resin, and may be formed in the size of a stone or baseball, and may be formed in a different shape or the size of an abrasive grain such as sand, in addition to the shape shown in FIG. may be

Meanwhile, the rotary flow forming unit 130 may include a pressure generating unit 132 , a fluid transfer pipe 134 , and a rotational flow forming nozzle 136 .

The pressure generating unit 132 is a component that supplies fluid at a high pressure and may include a compressor or a pump.

When the fluid supplied by the pressure generating unit 132 is water or nitrogen other than air, a tank for supplying the fluid may be separately provided and connected to the pressure generating unit 132 .

The fluid transfer pipe 134 may be provided to guide the fluid delivered from the pressure generating unit 132 to the front casing 110 and the rear casing 120 .

In addition, the front casing 110 and the rear casing 120 may be coupled to the fluid transfer pipe 134 to maintain a gap therebetween.

In addition, the rotary flow forming nozzle 136 is formed on the surfaces of the front casing 110 and the rear casing 120 facing the washing space so that the fluid supplied from the fluid transfer pipe 134 is rotated. It may be provided to discharge into the washing space.

The rotary flow forming nozzle 136 may include a first nozzle 137 and a second nozzle 138 .

On the other hand, as shown in FIG. 5, the area near the edge of the surface facing the washing space of the front casing 110 and the rear casing 120 is referred to as a first area 112, and the first area 112 ) will be referred to as a second region 114.

The first nozzle 137 is disposed in the first area 112 near the rim of the surface of the front casing 110 and the rear casing 120 facing the washing space, and distributes the fluid to the rim of the pipe 10. A plurality of them may be arranged to discharge in a normal direction.

In addition, the second nozzle 138 is disposed in the second region 114 of the surfaces of the front casing 110 and the rear casing 120 facing the washing space, and supplies the fluid to the first nozzle 137. A plurality of tubes may be arranged to be discharged in a direction in which a normal direction of the inner circumferential surface of the pipe 10 rotated by and a direction toward the outside of the radius of the pipe 10 are combined.

In addition, the front casing 110 and the rear casing 120 may be provided with passages for supplying the fluid supplied from the fluid transfer pipe 134 to the first nozzle 137 and the second nozzle 138.

That is, since the fluid discharged by the first nozzle 137 is discharged toward the normal direction of the rim of the pipe 10, the fluid discharged from the first nozzle 137 covers the inner circumferential rim of the pipe 10. can be moved along.

In addition, the fluid discharged by the second nozzle 138 is discharged in a direction in which a normal direction of the inner circumferential surface of the pipe 10 and a direction toward the outside of the radius of the pipe 10 are combined.

Therefore, as shown in FIG. 6, among the washing balls 150 inside the washing space, the washing balls 150 located near the inner circumferential edge of the pipe 10 are formed by the first nozzle 137. While being rotated along the inner circumferential surface of the pipe 10 by the rotational flow, the scale 20 formed on the inner circumferential surface of the pipe 10 collides with the scale 20 to be removed by cutting or damaging the scale 20 .

In addition, the cleaning balls 150 located in the second area 114 among the cleaning balls 150 inside the washing space are rotated by the rotational flow discharged from the second nozzle 138 to the radius of the pipe 10. While moving outward, it may collide with the scale 20 while moving along the rotary flow discharged from the first nozzle 137 .

Therefore, the washing ball 150 located inside the center of the washing space can also be moved to the inner circumferential side of the pipe 10 as a rotational flow by the second nozzle 138 .

On the other hand, as described above, the front casing 110 and the rear casing 120 are formed in a smaller size than the inner circumferential surface of the pipe 10, which means that the scale 20 is formed on the inner circumferential surface of the pipe 10, The actual inner diameter of the pipe 10 is also narrower than the initial inner diameter of the pipe 10, and the fluid discharged by the first nozzle 137 and the second nozzle 138 must be discharged to the outside of the washing space. to be.

Therefore, a gap is formed between the front casing 110 and the rear casing 120 and the inner circumferential surface of the pipe 10, and the cleaning balls 150 should not escape through the gap.

Therefore, it is formed around the front casing 110 and the rear casing 120, and the scale on the inner circumferential surface of the front casing 110 and the rear casing 120 and the pipe 10 or the inner circumferential surface of the pipe 10 The skirt part is formed of a flexible material that can be deformed according to the shape of the inner circumferential surface of the pipe 10 or the shape of the scale 20 without discharging the washing balls 150 while discharging the fluid. (160) may be further formed.

That is, the skirt portion 160 is formed around the front casing 110 and the rear casing 120 to discharge the fluid while preventing the washing ball 150 from being separated, and the pipe 10 and A brush 162 formed of an elastic material to be deformable according to the shape of the scale 20 may be included.

Therefore, the fluid can be discharged through the space between the brushes 162 and the cleaning ball 150 can be prevented from escaping to the outside of the cleaning space. In addition, since the brush 162 supports the front casing 110 and the rear casing 120, it is possible to prevent the front casing 110 and the rear casing 120 from directly contacting the scale 20. .

The front casing 110 and the rear casing 120 have various sizes, and can be mounted on the fluid transfer pipe 134 according to the inner diameter size of the pipe 10 and the thickness of the formed scale 20 that need to be cleaned. there is.

On the other hand, the pipeline cleaning device 100 according to the present embodiment uses the pressure of the fluid generated by the pressure generating unit 132, the front casing 110, the rear casing 120 and the rotary flow forming unit 130 ) A forward moving unit 170 for advancing the inside of the pipe 10 may be further provided.

As described above, the forward movement unit 170 is a component that generates forward pressure using the pressure of the fluid, and is provided on the opposite side of the rear casing 120 toward the washing space, and is a pipe cleaning device. It may include one or more advancing nozzles 172 that spray fluid toward the rear side of 100.

The pipeline cleaning device 100 may move forward by the reaction of the fluid injected from the forward nozzle 172 .

In addition, the forward nozzle 172 is connected to the fluid movement pipe 134 to receive fluid, and the fluid flow pipe 134 is supplied to the forward movement part 170. The branch controls the amount or pressure of the fluid. A valve 174 may be provided.

By adjusting the branch valve 174, it is possible to control whether or not the pipe cleaning device 100 advances and the forward movement amount.

Hereinafter, a pipe cleaning method using the aforementioned pipe cleaning device 100 will be described.

As shown in FIG. 8, the pipe cleaning method according to the present embodiment may include an insertion step (S110), a separation step (S120), a movement step (S130), a removal step (S140), and a purge step (S150). there is.

The inserting step (S110) is a step of inserting and positioning the pipe cleaning device 100 described above into the inner circumferential surface of the pipe 10 to be cleaned.

Before the insertion step (S110) of the pipe 10 to be cleaned, work tools may be installed at both ends of a portion requiring cleaning work, and both ends of the cleaning section may be opened to form an inlet and an outlet.

After placing the pipe cleaning device 100 on the inner circumferential surface of the pipe 10 in the insertion step (S110), a peeling step (S120) may be performed.

In the peeling step (S120), a rotational flow is formed inside the washing space of the pipe cleaning device 100 so that the cleaning ball 150 repeatedly collides with the scale 20 formed on the inner circumferential surface of the pipe to cut the scale 20 This is the peeling step.

In the peeling step (S120), after the peeling of the scale 20 of the portion corresponding to the washing space on the inner circumferential surface of the pipe 10 is completed and the washing is completed, the pipe cleaning device 100 through the moving step (S130) can be moved.

In the moving step (S130), the pipe cleaning device 100 may be moved by using the pressure of the fluid sprayed from the forward moving unit 170.

After the moving step (S130), the peeling step (S120) may be performed again, and these moving steps (S130) and the peeling step (S120) may be repeatedly performed until the cleaning of the pipe 10 is completed. .

After the cleaning of the inner circumferential surface of the conduit using the conduit cleaning device 100 is finished, a removal step ( S140 ) of taking the conduit cleaning device 100 out of the pipe 10 may be performed.

After the stripping step (S140), a purge step (S150) may be performed. After the cleaning operation using the pipe cleaning device 100 is completed, the peeled scale 20 may remain on the inner circumferential surface of the pipe 10. In the purge step (S150), the peeled scale 20 ) can be discharged from the pipe 10 to form a clean pipe 10.

Although the embodiments of the present invention have been described, the spirit of the present invention is not limited by the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention may add or change components within the scope of the same spirit. Other embodiments can be easily proposed by adding, deleting, adding, etc., but this will also be said to be within the scope of the present invention.

10 pipe 20 scale
100 Pipe cleaning device 110 Front casing
112 1st area 114 2nd area
120 rear casing 130 rotary flow forming part
132 pressure generating unit 134 fluid transfer pipe
136 rotary flow forming nozzle 137 first nozzle
138 Second nozzle 150 Washing ball
153 tooth 170 forward movement
172 Advance nozzle 174 Branch valve
160 skirt part 162 brush
S110 insertion step S120 peeling step
S130 moving step S140 removing step
S150 purge step

Claims (14)

a front casing inserted inside the pipe to be washed and having a shape corresponding to the shape of the inner circumferential surface of the pipe;
a rear casing disposed inside the pipe at a predetermined distance from the front casing and having a shape corresponding to an inner circumferential shape of the pipe to form a washing space between the rear casing and the front casing;
a rotating flow forming unit configured to rotate the fluid inside the washing space along an inner circumferential surface of the pipe to form a rotating flow;
Washing balls disposed in the washing space and rotating around the inner circumferential surface of the pipe by the rotary flow generated by the rotary flow forming unit in the washing space collide with the scale formed around the inner circumferential surface of the pipe to remove the scale. ;
including,
The rotary flow forming unit,
a pressure generating unit for sending out fluid at high pressure;
a fluid transfer pipe for guiding the fluid sent from the pressure generating unit to the front and rear casings;
rotary flow forming nozzles formed on surfaces of the front and rear casings facing the washing space to discharge the fluid supplied from the fluid transfer pipe to form a rotary flow;
including,
A pipe cleaning device for injecting at least one fluid of air, nitrogen, and water into the washing space and rotating the injected fluid to form a rotational flow.
delete delete delete According to claim 1,
The rotary flow forming nozzle,
a plurality of first nozzles disposed in a first region near the rims of surfaces of the front and rear casings facing the washing space to discharge fluid in a direction normal to the inner circumferential surface of the pipe;
It is disposed in the second area located at the center of the first area on the surface of the front casing and the rear casing facing the washing space, and directs the fluid toward the direction rotated by the first nozzle and the outside of the radius of the pipe. a plurality of second nozzles arranged to discharge in a combined direction;
Including, pipe cleaning device. According to claim 1,
The front casing and the rear casing are formed to have a smaller size than the inner circumferential surface of the pipe. According to claim 6,
It is formed around the front casing and the rear casing, and fills the gap between the front casing and the rear casing and the inner circumferential surface of the pipe or the scale on the inner circumferential surface of the pipe, and discharges the fluid while not discharging the cleaning ball, and the pipe A skirt portion formed of a flexible material that can be deformed according to the shape of the inner circumferential surface or the shape of the scale; Further comprising a pipe cleaning device. According to claim 7,
The skirt portion includes a brush formed of an elastic material, the pipe cleaning device. According to claim 1,
Further comprising a forward movement unit for advancing the front casing, the rear casing, and the rotating flow forming unit from the inside of the pipe by using the pressure of the fluid generated by the pressure generating unit. According to claim 9,
The forward movement unit,
At least one or more are disposed on a surface opposite to the surface of the rear casing facing the washing space, and spray the fluid moved through the fluid transfer pipe to the rear side of the rear casing, and as a reaction, form the front casing, the rear casing, and a rotational flow. A pipe cleaning device, provided to advance the unit. According to claim 9,
Further comprising a branch valve provided in the fluid movement pipe to adjust the amount or pressure of the fluid supplied to the forward movement unit. In the pipe cleaning method of cleaning the inner circumferential surface of the pipe through the pipe cleaning device of any one of claims 1 and 5 to 11,
An insertion step of inserting and positioning the pipe cleaning device according to any one of claims 1 and 5 to 11 into the inner circumferential surface of the pipe;
After the insertion step, inside the cleaning space of the pipe cleaning device, a pressure generating unit for sending out fluid at a high pressure, a fluid transfer pipe for guiding the fluid sent from the pressure generating unit to the front casing and the rear casing, and the front casing and the A rotational flow is formed using a rotational flow forming unit including a rotational flow forming nozzle formed on the surface of the rear casing facing the washing space and discharging the fluid supplied from the fluid transfer pipe to form a rotational flow so that the cleaning balls are disposed on the inner surface of the conduit. Peeling step of repeatedly colliding with the scale formed on the peeling of the scale;
After the peeling step, a moving step of advancing the pipe cleaning device;
Pipe cleaning method comprising a. According to claim 12,
The pipe cleaning method in which the peeling step is repeatedly performed after each moving step. According to claim 12,
a disassembly step of taking out the pipe cleaning device from the inside of the pipe after the cleaning of the inner circumferential surface of the pipe using the pipe cleaning device is finished;
After the stripping step, a purge step of cleaning the exfoliated scale accumulated on the inner circumferential surface of the pipe; further comprising a pipe cleaning method.

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