CN112750543A

CN112750543A - Heat transfer tube inspection device

Info

Publication number: CN112750543A
Application number: CN202010142831.8A
Authority: CN
Inventors: 杨星圭; 金德镒; 金在镐; 朴钟熙; 成耆德
Original assignee: Doosan Heavy Industries and Construction Co Ltd
Current assignee: Doosan Heavy Industries and Construction Co Ltd
Priority date: 2019-10-29
Filing date: 2020-03-04
Publication date: 2021-05-04
Also published as: KR102271732B1; KR20210050981A; CN211828151U

Abstract

The invention discloses a steam generator inspection device which can make a detection head with a camera move in a required direction easily. A heat transfer tube inspection apparatus according to an embodiment of the present invention includes: a rail portion configured to be inserted into an interior of the steam generator; a detection head having a camera and a light emitting element; a transport vehicle installed to be movable along the rail portion to move the detection head; and a tube assembly including a plurality of flexible protection tubes electrically connected to the detection head; the protection pipes are fixed to adjacent protection pipes by a plurality of joint portions, and the joint portions are formed to be spaced apart from each other in a longitudinal direction of the pipe combination body.

Description

Heat transfer tube inspection device

Technical Field

The present invention relates to a heat transfer tube inspection apparatus, and more particularly, to a heat transfer tube inspection apparatus (inspection apparatus) capable of inspecting whether or not foreign matter or the like is present in a gap between heat transfer tubes attached to a steam generator or the like.

Background

The steam generator is provided with a plurality of heat transfer pipes formed in a bundle shape, and the heat transfer pipes perform heat exchange between primary side system water having radiant energy and secondary side system water driving a turbine to rotate, and also have a function of separating the primary side system water from the secondary side system water.

In the steam generation process of the steam generator, the heated primary side system water flows inside the heat transfer pipe of the steam generator along the pipe, and the secondary side system water supplied to the outside of the heat transfer pipe crosses the outside of the heat transfer pipe so that the primary side system water and the secondary side system water exchange heat with each other through the pipe wall of the heat transfer pipe. The primary-side system water thus heat-exchanged is recirculated to the nuclear reactor along a closed-circuit pipe line, and the secondary-side system water is converted into steam.

When a portion of the steam generator in which the coolant flows is set as a primary side and a portion of the steam generator in which the feedwater and the steam flow is set as a secondary side, foreign matter may be included in the water supplied to the secondary side while circulating inside the secondary side. Therefore, the quality of the heat transfer pipe existing inside the secondary side is reduced, and therefore, it is necessary to develop a technique for inspecting and removing foreign matter inside the secondary side.

In particular, when the steam generator is installed in a nuclear power plant, the primary side system water may contain radiant energy, and when the heat transfer pipe is damaged, the primary side system water penetrating through the heat transfer pipe leaks to the outside to cause leakage of the radiant energy, so it is very important to ensure the soundness of the heat transfer pipe.

The prior art discloses devices carrying cameras in order to inspect and remove foreign matter inside the steam generator. However, in the prior art, even if a device with a camera is put into a steam generator, the movement of the device is difficult to be stably controlled. In addition, in order to move the camera between the heat transfer tubes, it is necessary to obtain a structural support having a linearity and a flexibility, and it is difficult for the conventional camera device to stably move between the heat transfer tubes.

Disclosure of Invention

Based on the above technical background, the present invention discloses an inspection device for a steam generator, which can easily move a detection head with a camera in a desired direction.

A heat transfer tube inspection apparatus according to an embodiment of the present invention includes: a rail portion configured to be inserted into an interior of the steam generator; a detection head having a camera and a light emitting element; a transport vehicle installed to be movable along the rail portion to move the detection head; a tube assembly including a plurality of flexible protective tubes electrically connected to the detection head; the protection pipes are fixed to adjacent protection pipes by a plurality of joint portions, and the joint portions are formed to be spaced apart from each other in a longitudinal direction of the pipe combination body.

The protective tube can be formed by a helical spring.

Also, the joint portion may be constituted by a welded portion formed by welding the protection pipe.

Also, the protection pipes may be arranged on a virtual plane, and the pipe coupling body is installed to penetrate through the carrier vehicle to protrude from a distal end of the carrier vehicle and to move relative to the carrier vehicle.

Also, the joint can be constituted by a point that is joined to an adjacent protection pipe.

Further, the joint portion formed at one side end of one of the protection pipes and the joint portion formed at the other side end of the one of the protection pipes may be disposed to be spaced apart from each other in a longitudinal direction of the protection pipe.

Also, the engaging portion may be constituted by a line continuous from one side end to the other side end of the tube coupling body.

Also, a cable transmitting current or signals is insertedly installed inside the protective pipe, and the pipe coupling body may include a reinforcing cord disposed outside the protective pipe to reinforce the strength of the pipe coupling body and continuous in a length direction of the protective pipe.

Also, the reinforcing cord can be constituted by a hollow-shaped coil.

The reinforcing cable is made of a polymer and is fusion-bonded to the protective pipe.

The reinforcing cable has a groove into which the protective pipe is inserted, and the protective pipe disposed on the outermost side can be inserted and supported.

Furthermore, the reinforcing cable can be formed with a greater rigidity (stiffness) and a smaller diameter than the protective tube.

Further, the heat transfer pipe inspection apparatus may further include a main pulley around which the rail portion is wound, the rail portion being disengaged from the main pulley when the main pulley rotates and being insertable in an arc shape along a circumferential direction of the steam generator.

The rail portion includes a plurality of rail members hinged to each other and a fixing cord for fixing the plurality of rail members, and the rail member includes: an upper flange part, both sides of which are provided with a first connecting part and a second connecting part so as to be hinged with adjacent track components; a pillar portion projecting downward from the upper flange portion; and a lower flange portion fixed to a lower end of the pillar portion and opposed to the upper flange portion; the fixing cord may be attached to penetrate the lower flange portion.

Further, the transport vehicle includes: a transporter body; a plurality of running rollers mounted on a lower portion of the carriage body and rotating in contact with the rail portion; a transfer roller that rotates in contact with the pipe joint body and moves the pipe joint body; and a guide arm rotatably coupled with respect to the body portion; the tube combination body protrudes toward the distal end of the guide arm.

Drawings

Fig. 1 is a diagram showing a state in which a heat transfer pipe inspection device according to a first embodiment of the present invention is installed in a steam generator.

Fig. 2 is a diagram showing a part of a rail portion of the first embodiment of the present invention.

Fig. 3 is a diagram showing a transport vehicle of the first embodiment of the present invention.

Fig. 4 is a view showing a detection head and tube assembly according to the first embodiment of the present invention.

Fig. 5 is a sectional view showing the tube combination body according to the first embodiment of the present invention after being cut.

Fig. 6 is a view showing a foreign substance removing portion of the first embodiment of the present invention.

Fig. 7 is a diagram showing a foreign substance removal portion according to a modification of the first embodiment of the present invention.

Fig. 8 is a view showing a tube combination body according to a second embodiment of the present invention.

Fig. 9 is a view showing a tube combination body according to a third embodiment of the present invention.

Fig. 10 is a view showing a tube combination body according to a fourth embodiment of the present invention.

Fig. 11 is a view showing a pipe coupling body according to a fifth embodiment of the present invention.

Detailed Description

While the invention is susceptible to various modifications and alternative embodiments, specific embodiments thereof are shown by way of example in the drawings and are herein described in detail. However, the present invention is not limited to the specific embodiments, and all changes, equivalents and substitutes included in the spirit and technical scope of the present invention should be construed as belonging to the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular references also include plural references unless clearly distinguishable within the context of a sentence. The terms "comprising" or "having" of the present invention are used to specify the presence of the features, numerals, steps, actions, components, parts, or combinations thereof described in the specification, and are not to be construed as precluding the presence or addition of one or more other features, numerals, steps, actions, components, parts, or combinations thereof in advance.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In this case, it should be noted that the same reference numerals are used for the same components as much as possible in the drawings. Also, descriptions about well-known structures or functions that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings may be exaggerated, schematically illustrated, or omitted.

The steam generator inspection apparatus according to the first embodiment of the present invention will be described below.

Referring to fig. 1, the heat transfer tube inspection device 10 of the first embodiment may include a rail portion 300, a transport vehicle 200, an inspection head 400, and a tube combination 500. The heat transfer pipe inspection apparatus 10 may be an apparatus for inspecting the insulating pipe 26 installed inside the steam generator 20, but the present invention is not limited thereto. The steam generator 20 is a device for heating secondary system water using high-temperature primary system water, and includes a plurality of insulating pipes 26 through which the primary system water moves.

The transporting carriage 200 can be moved substantially along the rail part 300 provided in the inner space of the steam generator 20, and at this time, the rail part 300 can be inserted and installed through the hand hole 25 formed at the steam generator 20.

The rail portion 300 is stored in a state of being wound around the main pulley 102, and can be introduced into the steam generator 20 when inspection is required. The rail part 300 can be inserted in an arc shape along the circumferential direction of the steam generator 20. The rail part 300 is inserted into the outer space 24 of the steam generator 20, and the outer space 24 may be defined as follows: a space exists between the inner side of the outer wall 21 of the steam generator 10 and the outermost heat transfer tubes 26.

The rail portion 300 is formed with a curvature corresponding to the outer space 24, whereby the rail portion 300 may not abut against or otherwise be partially spaced apart from the outer wall 21 of the steam generator 20. The guide 22 can be installed in the hand hole 25, and the rail portion 300 can be pushed up along the guide 22 by a force applied from the rear. The main pulley 102 is rotatably mounted to a frame 101, and the frame 101 can be fixed to a hand hole 25.

The driving unit 100 may be mounted on the rail part 300 and the pipe combination 500, and the driving unit 100 may include a frame 101 and a main pulley 102 and a sub-pulley 103 rotatably mounted on the frame 101. The rail portion 300 is wound around the main pulley 102, and the movement rope can be wound around the sub-pulley 103.

Referring to fig. 2, the track part 300 may include a plurality of track members 320 hinged to each other and a fixing string 340 connecting the track members 320. The rail member 320 may include: an upper flange part 323 having a first connecting part 321 and a second connecting part 322 at both sides thereof so as to be hinged to the adjacent rail member 320; a pillar portion 324 protruding from the lower portion; the lower flange 325 is fixed to the lower end of the pillar 324 and faces the upper flange 323. Thereby, a recess is formed between the upper flange 323 and the lower flange 325. Also, a roller 380 guiding the movement of the carriage 200 may be installed at the second connection portion 322.

The position of the rotatably coupled rail member 320 is fixed by a fixing string 340, and the fixing string 340 is installed to penetrate the lower flange 325. A support wheel may be mounted on the frame 101, and one end of the fixing string 340 may be wound around the support wheel. The support wheels may be mounted within the main sheave 102 or may be mounted separately from the main sheave 102. When the support wheel pulls the fixing rope 340, the rail member 320 can be firmly supported.

A magnet 326 may be mounted to the lower flange portion 325, the magnet 326 abutting the opposing rail member 320, whereby the adjacent rail members 320 may be more easily engaged.

On the other hand, the movement rope 120 for moving the transport vehicle 200 is attached to the rail part 300, and the support wheels 360 for supporting the movement rope 120 are attached to the rail member 320 disposed at the extreme end among the rail members 320. A part of the movement rope 120 is disposed on the upper portion of the rail portion 300 and connected to the transport vehicle 200, and the other part of the movement rope 120 is attached so as to penetrate the column portion 324 and can be wound around the secondary pulley 103. Thereby, the carriage 200 can stably move along the movement rope 120.

Referring to fig. 3, the transporter 200 may include: a transporter body 210; a guide arm 230 protruding at a side of the carrier body 210; a plurality of running rollers 240 mounted on a lower portion of the carrier body 210; and a transfer roller 250 installed in the carrier body 210 and moving the tube assembly 500.

The carriage body 210 is formed in a substantially hexahedral shape, and the transfer rollers 250, the motor, and the like may be installed therein. The transfer roller 250 rotates while contacting the pipe coupling body 500, and a motor may be connected to the transfer roller 250. The tube assembly 500 may be advanced or retreated by the transfer roller 250, whereby the length of the tube assembly 500 protruding in front of the carriage 200 may be adjusted and the detection head 400 may be moved to a desired position.

The guide arm 230 is rotatably coupled with respect to the carrier body 210. Further, the guide arm 230 may be formed in a structure that allows the length to be extended and contracted by a cylinder. The guide arm 230 is formed in a structure bent in an L-shape. The tube combination 500 penetrates the guide arm 230 and protrudes from the end of the guide arm 230, being bent inside the guide arm 230. Also, a plurality of guide wheels 260 may be installed inside the guide arm 230, and the plurality of guide wheels 260 support the tube combination 500 to be bendable.

When the guide arm 230 is rotated, the tube coupling body 500 can be protruded in a desired direction. That is, the pipe coupling body 500 can move not only in the gravity direction but also in a direction perpendicular to the gravity direction or in a direction inclined with respect to the gravity direction.

A plurality of running rollers 240 that abut against the rail part 300 and rotate are installed at a lower portion of the carrier body 210, and the running rollers 240 may be connected to a motor and rotate. The movement rope 120 is attached to the carriage body 210, and the carriage 200 can be collected by the movement rope 120 when the running roller 240 fails to operate due to a failure of the motor or the like.

Fig. 4 is a view showing a tube assembly with a detection head according to a first embodiment of the present invention, and fig. 5 is a cross-sectional view showing the tube assembly according to the first embodiment of the present invention.

Referring to fig. 4 and 5, the inspection head 400 is formed in a substantially plate shape, and a camera 410,

light emitting elements

420 and 430, and a foreign substance removing portion 450 may be installed in the inspection head 400. The 2

light emitting elements

420 and 430 may be installed in the detection head 400, one light emitting element 420 may emit light when the camera 410 is operated, and the other light emitting element 430 may emit light when the foreign substance removing portion 450 is operated. The

light emitting elements

420, 430 may be formed of LEDs.

As shown in fig. 6, the foreign substance removing portion 450 may be configured to have a plurality of hooks 451, and when the foreign substance removing portion 450 is pulled, the distance between the ends of the hooks 451 is reduced so that the foreign substance removing portion 450 can separate and collect foreign substances from the heat transfer pipe.

As shown in fig. 7, the foreign substance removing portion 460 may include clips 461, and the distance between the clips is reduced when the foreign substance removing portion 460 is pulled so that the clips can clamp or separate the foreign substances from the heat transfer pipe.

As shown in fig. 4 and 5, the tube combination 500 may include: a protection tube 510 electrically connected to the detection head 400 and transmitting current and data to the detection head 400; and a reinforcing rope 520 fixed to the protective pipe 510.

The tube coupling body 500 is movably installed with respect to the carriage 200 and allows the detection head 400 to move. The tube coupling 500 is installed throughout the transport vehicle 200 and may be wound to the frame 101. Further, the pipe coupling body 500 may be mounted by being wound around the inside of the carriage 200.

The protective tube 510 and the reinforcing cord 520 are arranged on a virtual plane, so that the tube combination 500 can be formed in a substantially flat band shape. The pipe combination 500 can be more easily bent if the protective pipe 510 and the reinforcing rope 520 are aligned on a virtual plane.

The tube combination body 500 includes 4 protective tubes 510, and electric wires 550 for transmitting electric current and data are insertedly mounted to the protective tubes 510. The protective tube 510 is a flexible tube and may be formed of a coil in which a wire is spirally wound.

The protection pipes 510 are fixed to each other by the joint 530 and the joint 530 may be formed as a welded portion by welding. The joint 530 can be formed by laser welding, and can be formed as a point separated from the adjacent joint 530.

A plurality of joint portions 530 are formed on one protection tube 510, and the joint portions 530 can be arranged at predetermined intervals in the longitudinal direction of the protection tube 510. Further, the joint 530 for fixing the adjacent protective tubes 510 may be disposed in a direction perpendicular to the longitudinal direction of the protective tubes 510.

The reinforcing cord 520 may be formed of a coil in which a wire is spirally wound, and the wire is not inserted into the reinforcing cord 520. The reinforcing rope 520 may be fixed to the protection pipe 510 by means of a joint 530 formed by welding.

The pipe combination 500 may include 2 reinforcing cables 520, and the reinforcing cables 520 are disposed at the outermost side of the pipe combination 500. The reinforcing cable 520 is fixed to a protective pipe 510 disposed outside. The joint portions 530 formed on the reinforcing cord 520 may be disposed so as to be spaced apart from each other in the longitudinal direction of the reinforcing cord 520, and the reinforcing cord 520 may improve the rigidity of the pipe combination.

The tube coupling body 500 needs to be bent according to the rotation of the guide arm 230, and thus, not only needs to have flexibility but also needs to have strength so that the detection head 400 moves in a linear direction inside the steam generator.

As in the first embodiment, when the tube combination body 500 includes the protective tube 510 fixed by the joint 530 and the protective tube 510 is formed of a coil, the tube combination body 500 has not only flexibility but also strength so that the detection head 400 can be easily moved in a linear direction.

In order to allow the detection head 400 to move in a desired direction, the tube assembly 500 should be easily bent as the guide arm 230 rotates, and in order to inspect the heat transfer tube 26 located inside the steam generator 20, the tube assembly 500 should have strength and not be bent. When the flexible circuit board is used, the flexible circuit board cannot bear the weight of the detection head and is bent because the flexible circuit board has no strength.

In the first embodiment, the joint 530 is formed at a predetermined pitch in the plurality of protective tubes 510 formed of a coil, and the joint has flexibility and linearity, so that the detection head can move not only in the gravity direction but also in a direction inclined with respect to the gravity direction.

Further, if the pipe coupling body 500 includes the reinforcing cord 520 fixed to the protective pipe 510, the strength of the pipe coupling body 500 can be further improved. Further, since the plurality of joints 530 are spaced apart from each other in the longitudinal direction of the protective tube 510 at a predetermined pitch, the tube assembly can be prevented from being bent by the weight of the detection head 400 even if the tube assembly 500 is extended long.

The heat transfer pipe inspection apparatus according to a second embodiment of the present invention will be described below. Fig. 8 is a view showing a tube combination body according to a second embodiment of the present invention.

Referring to fig. 8, the heat transfer pipe inspection apparatus of the second embodiment and the heat transfer pipe inspection apparatus of the first embodiment are configured in the same manner except for the pipe coupling body 600, and therefore, a repetitive description of the same components will be omitted.

The tube combination 600 may include a protective tube 610 for transmitting current and data to the test head and a reinforcing cable 620 fixed to the protective tube 610. The pipe combination 600 includes 4 protective pipes 610 and 2 reinforcing cables 620, and electric wires for transmitting electric current and data can be insertedly mounted to the protective pipes 610. The protective tube 610 and the reinforcing cord 620 are formed of a flexible tube, and may be formed of a coil in which a wire is spirally wound.

The protection pipe 610 and the reinforcing cord 620 are fixed to each other by a joint 630 and the joint 630 may be formed of an adhesive substance. The adhesive substance can be formed by a polymer. However, the present invention is not limited thereto, and the joint portion 630 may be formed by welding. The joint 630 may be constituted by a point isolated from the adjacent joint. The plurality of joints 630 may be arranged at a predetermined interval in the longitudinal direction of the pipe coupling body.

Here, the first joint portion 631 formed at one side end of one of the protection pipes 610 and the second joint portion 632 formed at the other side end may be disposed to be spaced apart from each other in the longitudinal direction of the protection pipe 610. That is, the joining portions 630 adjacent in the width direction of the tube assembly 600 are arranged to be spaced apart from each other in the longitudinal direction of the tube assembly 600. The joint 630 includes first joints 631 and second joints 632, the first joints 631 being spaced apart from each other in the width direction of the pipe assembly 600, and the second joints 632 located between the first joints 631 being spaced apart from the first joints 631 in the length direction of the pipe assembly 600.

As in the second embodiment, if the joint portions 630 adjacent in the width direction of the tube assembly 600 are arranged to be spaced apart from each other in the longitudinal direction of the tube assembly 600, the straightness of the tube assembly 600 can be further improved.

The heat transfer pipe inspection apparatus according to a third embodiment of the present invention will be described below. Fig. 9 is a view showing a tube combination body according to a third embodiment of the present invention.

Referring to fig. 9, the heat transfer pipe inspection apparatus of the third embodiment is constructed in the same manner as the heat transfer pipe inspection apparatus of the first embodiment except for the pipe coupling body 700, and therefore, a repetitive description of the same components will be omitted.

Tube combination 700 may include a protective tube 710 to transmit current and data to a detection head and a reinforcing cable 720 fixed to protective tube 710. The pipe combination body 700 includes 4 protective pipes 710 and 2 reinforcing cables 720, and a cable for transmitting electric current and data is insertedly installed at the protective pipes 710. The protective tube 710 and the reinforcing cord 720 are made of flexible tubes, and can be made of coils in which wire materials are spirally wound.

The protection pipe 710 and the reinforcing cord 720 are fixed to each other by a joint 730 and the joint 730 can be constituted by a welded portion formed by welding. The joint 730 can be formed by laser welding and can be constituted by a line continuous from one side end to the other side end of the tube coupling body 700.

Here, the direction in which the joint 730 is continuous may be formed obliquely at a preset inclination angle a1 with respect to the width direction perpendicular to the length direction of the tube assembly 700. Here, the inclination angle a1 may be formed at 30 to 60 degrees.

As in the third embodiment in which the joint 730 is formed of a wire, the protection pipe 710 and the reinforcing cord 720 can be more stably fixed. Further, if the direction in which the joint 730 continues and the width direction of the tube assembly 700 are arranged obliquely, the tube assembly 700 can be bent more easily.

The heat transfer pipe inspection apparatus according to a fourth embodiment of the present invention will be described below. Fig. 10 is a view showing a tube combination body according to a fourth embodiment of the present invention.

Referring to fig. 10, the heat transfer pipe inspection apparatus of the fourth embodiment is constructed in the same manner as the heat transfer pipe inspection apparatus of the first embodiment except for the pipe joint body 800, and therefore, a repetitive description of the same components will be omitted.

The tube combination 800 may include a protective tube 810 for transmitting current and data to the detection head and a reinforcing cable 820 fixed to the protective tube 810. The pipe combination 800 includes 4 protective pipes 810 and 2 reinforcing cables 820, and electric wires for transmitting electric current and data are insertedly mounted on the protective pipes 810. The protective tube 810 is formed of a flexible tube and can be formed of a coil in which a wire is spirally wound.

The protective tube 810 and the reinforcing cord 820 are fixed to each other by a joint 830, and the joint 830 may be formed by welding. The joint 830 may be formed at a point spaced apart from the adjacent joint 830. The plurality of joints 830 may be arranged at predetermined intervals in the longitudinal direction of the pipe coupling body 800.

The reinforcing cable 820 may be formed of an internally filled metal wire, and may have a greater rigidity and a smaller flexibility than the protective pipe 810. Also, the reinforcing rope 820 can have a smaller diameter than the protective pipe 810. The reinforcing cables 820 are disposed on the outer sides of the tube combination body 800 in the width direction, and can be fixed to the protective tube 810 disposed on the outermost side by the joint 830.

If the reinforcing cord 820 having greater rigidity and smaller diameter than the protective tube 810 is fixedly installed at the outside of the protective tube 810 as in the fourth embodiment, the straightness of the tube coupling body 800 can be further improved and the tube coupling body 800 can be bent more easily.

A heat exchanger tube inspection apparatus according to a fifth embodiment of the present invention will be described below. Fig. 11 is a view showing a pipe coupling body according to a fifth embodiment of the present invention.

Referring to fig. 11, the heat transfer pipe inspection apparatus of the fifth embodiment is constructed in the same manner as the heat transfer pipe inspection apparatus of the first embodiment except for the pipe joint body 900, and therefore, a repetitive description of the same components will be omitted.

Tube combination 900 may include a protective tube 910 to transmit current and data to a test head and a reinforcing cable 920 secured to protective tube 910. The pipe combination 900 includes 4 protection pipes 910 and 2 reinforcing cables 920, and electric wires for transmitting electric current and data are insertedly mounted to the protection pipes 910. Protective tube 910 is formed of a flexible tube and can be formed of a coil in which a wire is spirally wound.

Protection tubes 910 are fixed to each other by first joint portion 931, and first joint portion 931 can be formed by welding. The first engagement portions 931 may be constituted at points spaced apart from the adjacent first engagement portions 931. The plurality of first engagement parts 931 may be disposed at a predetermined interval in a length direction of the pipe coupling body 900.

The reinforcing cord 920 is formed of a polymer material and can be formed in an internally filled configuration. The reinforcing cable 920 can have greater rigidity and less flexibility than the protective tube 910. The reinforcing cables 920 are disposed outside the tube combination in the width direction, and can be fixed to the protective tube 910 disposed on the outermost side via the second joint 932.

The reinforcing rope 920 is provided with a coupling groove 921 into which a side surface of the protection pipe is inserted, and the coupling groove 921 may be formed in an arc-shaped curve. Further, a surface of the reinforcing cord 920 facing in a direction opposite to the coupling groove 921 may be formed in a flat surface. The second joint 932 is formed by melting the reinforcing cord 920, and the reinforcing cord 920 is melt-joined to the protective tube. The plurality of second joints 932 may be disposed so as to be spaced apart from each other in the longitudinal direction of the reinforcing cord 920.

If the reinforcing cord 920 made of polymer is fixedly attached to the outside of the protection pipe 910 as in the fifth embodiment, the straightness of the pipe combination body 900 can be further improved and the pipe combination body 900 can be more easily bent. Further, since the coupling groove 921 is formed in the reinforcing cord 920, the reinforcing cord 920 can prevent the protection pipe 910 from being damaged.

The foregoing describes an embodiment of the present invention, and those skilled in the art can modify and change the present invention in various ways without departing from the scope of the present invention, such as by adding, changing, deleting or adding components, and such modifications and changes should be construed as falling within the scope of the present invention.

Claims

1. A heat transfer tube inspection device for inspecting foreign matter inside a steam generator,

the method comprises the following steps:

a rail portion configured to be inserted into an interior of the steam generator;

a detection head having a camera and a light emitting element;

a transport vehicle installed to be movable along the rail portion to move the detection head; and

a tube assembly including a plurality of flexible protective tubes electrically connected to the detection head;

the protection pipes are fixed to adjacent protection pipes by a plurality of joint portions, and the joint portions are spaced apart from each other in a longitudinal direction of the pipe combination body.

2. The heat transfer pipe inspection device according to claim 1,

the protective tube is composed of a coil spring.

3. The heat transfer pipe inspection device according to claim 2,

the joint portion is constituted by a welded portion formed by welding the protection pipe.

4. The heat transfer pipe inspection device according to claim 1,

the protection tubes are arranged on a virtual plane,

the pipe coupling body is installed to protrude from an end of the carrier vehicle through the carrier vehicle and to move relative to the carrier vehicle.

5. The heat transfer pipe inspection device according to claim 1,

the joint is constituted by a point of engagement with an adjacent protection pipe.

6. The heat transfer pipe inspection device according to claim 1,

the joint portion formed at one side end of one of the protection pipes and the joint portion formed at the other side end are arranged to be spaced apart from each other in a longitudinal direction of the protection pipe.

7. The heat transfer pipe inspection device according to claim 1,

the joint portion is constituted by a line continuous from one side end to the other side end of the pipe joint body.

8. The heat transfer pipe inspection device according to claim 1,

a cable transmitting current or signals is insertedly installed inside the protective pipe, and the pipe coupling body includes a reinforcing cord disposed outside the protective pipe to reinforce the strength of the pipe coupling body and continuous in a length direction of the protective pipe.

9. The heat transfer pipe inspection device according to claim 8,

the reinforcing cord is formed of a hollow-shaped coil.

10. The heat transfer pipe inspection device according to claim 8,

11. The heat transfer pipe inspection device according to claim 10,

the reinforcing rope has a groove into which the protective pipe is inserted, and the protective pipe disposed on the outermost side is inserted and supported.

12. The heat transfer pipe inspection device according to claim 8,

the reinforcing rope has a greater rigidity and a smaller diameter than the protective pipe.

13. The heat transfer pipe inspection device according to claim 1,

and a main pulley around which the rail part is wound, the rail part being disengaged from the main pulley upon rotation of the main pulley and being inserted in an arc shape in a circumferential direction of the steam generator.

14. The heat transfer pipe inspection device according to claim 1,

the track part comprises a plurality of track components hinged with each other and a fixing rope for fixing the plurality of track components,

the rail member includes: an upper flange part, both sides of which are provided with a first connecting part and a second connecting part so as to be hinged with adjacent track components; a pillar portion projecting downward from the upper flange portion; and a lower flange portion fixed to a lower end of the pillar portion and opposed to the upper flange portion;

the fixing cord is attached to penetrate the lower flange portion.

15. The heat transfer pipe inspection device according to claim 1,

the transport vehicle includes: a transporter body; a plurality of running rollers mounted on a lower portion of the carriage body and rotating in contact with the rail portion; a transfer roller that rotates in contact with the pipe joint body and moves the pipe joint body; and a guide arm rotatably coupled with respect to the carriage body;

the tube combination body protrudes from the distal end of the guide arm.