KR20210050981A - Inspection apparatus for heat transfer pipe - Google Patents

Abstract

The present invention provides an inspection apparatus for a steam generator which can easily move an inspection head having a camera in a desired direction. According to one aspect of the present invention, the inspection apparatus for a heat transfer pipe comprises: a rail unit inserted into and arranged in the steam generator; an inspection head including a camera and a light-emitting element; a cart which is installed to be moved along the rail unit, and moves the inspection head; and a pipe assembly which is electrically connected to the inspection head and includes a plurality of protection pipes having flexibility. The protection pipes are fixed on neighboring protection pipes by a plurality of joining units. The joining units are separated and formed in the longitudinal direction of the pipe assembly.

Description

Heat transfer pipe inspection device {INSPECTION APPARATUS FOR HEAT TRANSFER PIPE}

The present invention relates to a heat transfer pipe inspection apparatus, and more particularly, to a heat transfer pipe inspection apparatus capable of inspecting the presence or absence of foreign substances in a gap in a heat transfer pipe installed in a steam generator or the like.

Inside the steam generator, a number of heat transfer pipes in a bundle form are provided, and these heat transfer pipes perform heat exchange between the primary system tree containing radioactivity and the secondary system tree that runs the turbine. It functions to separate.

Looking at the steam generation process of the steam generator, the heated primary system water flows through the inside of the heat transfer pipe of the steam generator along the pipe, and the secondary system water supplied to the outside of the heat transfer pipe crosses the outside of the heat transfer pipe, with the pipe wall of the heat transfer pipe in between. The secondary system water and the secondary system water perform heat exchange. Through this, the heat-exchanged primary system water is circulated back to the nuclear reactor along the closed circuit duct, and the secondary system water is converted into steam.

When the part in which the coolant flows in the steam generator is referred to as the primary side, and the part in which the water supply and steam flow is referred to as the secondary side, the water supplied to the secondary side may circulate inside the secondary side and carry foreign substances. Accordingly, it is necessary to develop a technology for inspection and removal of foreign substances inside the secondary side, since the quality of the heat transfer tube existing inside the secondary side may be impaired.

In particular, when the steam generator is installed in a nuclear power plant, the primary system tree may contain radioactivity, and if there is damage to the heat transfer pipe, the primary system water penetrating the inside of the heat transfer pipe may leak to the outside and the radioactivity may leak. It is very important to secure.

Devices equipped with cameras have been proposed to inspect and remove foreign substances inside the steam generator. However, in the related art, even if a device having a camera is inserted into the steam generator, it is difficult to control the stable movement of the device. In addition, in order for the camera to move between heat transfer tubes, it must be supported on a structure having straightness and flexibility, but the conventional camera device has a problem that it is difficult to stably move between heat transfer tubes.

Based on the technical background as described above, the present invention provides a steam generator inspection apparatus capable of easily moving an inspection head having a camera in a desired direction.

A heat transfer pipe inspection apparatus according to an aspect of the present invention includes a rail portion inserted into the steam generator, an inspection head including a camera and a light emitting element, a bogie movably installed along the rail portion and moving the inspection head, And a pipe joint electrically connected to the inspection head and including a plurality of flexible protective pipes, wherein the protective pipes are fixed to neighboring protective pipes by a plurality of joints, wherein the joints are spaced apart in the longitudinal direction of the pipe joint. Is formed.

Here, the protective tube may be formed of a coil spring.

In addition, the joint portion may be formed of a welding portion in which the protective pipes are formed by welding.

In addition, the protective tubes are arranged on one virtual plane, and the tube assembly penetrates the bogie and protrudes from the front end of the bogie, and may be installed to move relative to the bogie.

In addition, the bonding portion may be formed as a point of bonding with neighboring protective tubes.

In addition, a junction formed at one side end of one of the protection tubes and a junction formed at the other side of the protection tube may be spaced apart from each other in the longitudinal direction of the protection tube.

In addition, the joint portion may be formed of a line extending from one side end of the pipe joint to the other side end.

In addition, a cable for transmitting a current or a signal is inserted and installed in the inside of the protection tube, and the tube assembly is disposed outside the protection tube to reinforce the strength of the tube assembly and includes a reinforced cable connected in the longitudinal direction of the protection tube. I can.

In addition, the reinforced cable may be formed of a hollow coil.

In addition, the reinforced cable is made of a polymer, and may be melt-bonded to the protective tube.

In addition, the reinforced cable may have a groove into which the protective tube is inserted, and the protective tube disposed at the outermost side may be inserted and supported.

In addition, the reinforced cable may have a greater stiffness than the protective tube and may have a smaller diameter than the protective tube.

In addition, the heat transfer pipe inspection apparatus further includes a main pulley wound around the rail part, and the rail part may be separated from the main pulley when the main pulley rotates and inserted in an arc shape in the circumferential direction of the steam generator.

In addition, the rail unit includes a plurality of rail pieces hingedly connected to each other and a fixing wire for fixing the plurality of rail pieces, and the rail pieces have first and second connection parts on both sides to enable hinge connection with adjacent rail pieces. An upper flange provided with, and a web portion protruding downward from the upper flange, a lower flange fixed to a lower end of the web portion and facing the upper flange, and the fixing wire may be installed to penetrate the lower flange .

In addition, the bogie is a bogie body and a plurality of traveling rollers that are installed under the bogie body and rotate in contact with the rail, and the transfer roller and the body portion rotate in contact with the tube assembly and move the tube assembly. It includes a guide arm that is rotatably coupled, and the pipe joint may protrude toward the tip of the guide arm.

1 is a view showing a state in which a heat transfer pipe inspection apparatus according to a first embodiment of the present invention is installed in a steam generator.
2 is a view showing a part of the rail according to the first embodiment of the present invention.
3 is a view showing a balance according to the first embodiment of the present invention.
4 is a view showing an inspection head and a pipe joint according to the first embodiment of the present invention.
5 is a cross-sectional view of a pipe joint according to a first embodiment of the present invention.
6 is a view showing a foreign material removing unit according to the first embodiment of the present invention.
7 is a view showing a foreign material removing unit according to a modified example of the first embodiment of the present invention.
8 is a view showing a pipe joint according to a second embodiment of the present invention.
9 is a view showing a pipe joint according to a third embodiment of the present invention.
10 is a view showing a pipe joint according to a fourth embodiment of the present invention.
11 is a view showing a pipe joint according to a fifth embodiment of the present invention.

The present invention is intended to illustrate specific embodiments and to be described in detail in the detailed description, since various transformations may be applied and various embodiments may be provided. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used in the present invention are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present invention, terms such as'include' or'have' are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that in the accompanying drawings, the same components are indicated by the same reference numerals as much as possible. In addition, detailed descriptions of known functions and configurations that may obscure the subject matter of the present invention will be omitted. For the same reason, some elements in the accompanying drawings are exaggerated, omitted, or schematically illustrated.

Hereinafter, a steam generator inspection apparatus according to a first embodiment of the present invention will be described.

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

Referring to FIG. 1, the apparatus 10 for inspecting a heat transfer pipe according to the first embodiment includes a rail unit 300, a bogie 200, an inspection head 400, a pipe assembly 500, and a driving unit 100. It may include. The heat transfer pipe inspection device 10 may be a device that inspects 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 a secondary system water using a high-temperature primary system water and includes a plurality of insulating pipes 26 through which the primary system water moves.

The bogie 200 can basically move along the rail part 300 provided in the space inside the steam generator 20, and at this time, the rail part 300 is a hand hole formed in the steam generator 20 ( It can be inserted and installed through 25).

The rail unit 300 may be stored while being wound around the main pulley 102 and may be introduced into the steam generator 20 when inspection is required. The rail part 300 may be inserted in an arc shape in 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 exists between the inner surface of the outer wall 21 of the steam generator 10 and the outermost heat transfer pipes 26. It can be defined as a space to do.

The rail part 300 is made to have a curvature corresponding to the outer space 24, and accordingly, the rail part 300 is spaced apart without contacting the outer wall 21 or other parts of the steam generator 20. I can keep it. A guide member 22 may be installed in the hand hole 25, and the rail part 300 may be pushed up by a force pressed from the rear along the guide member 22. The main pulley 102 is installed to be rotatable on the frame 101, and the frame 101 may be fixed to the hand hole 25.

The driving unit 100 may include a frame 101 and a main pulley 102 and a sub pulley 103 that are rotatably installed on the frame 101. The rail part 300 is wound around the main pulley 102, and the moving wire can be wound around the sub pulley 103.

2 is a view showing a part of the rail according to the first embodiment of the present invention.

Referring to FIG. 2, the rail unit 300 may include a plurality of hinged rail pieces 320 and a fixing wire 340 connecting the rail pieces 320. The rail piece 320 includes an upper flange 323 having a first connecting portion 321 and a second connecting portion 322 on both sides to enable hinge connection with the adjacent rail piece 320 and a web portion 324 protruding downward. It is fixed to the lower end of the web portion 324, may include a lower flange 325 facing the upper flange 323. Accordingly, a concave portion is formed between the upper flange 323 and the lower flange 325. In addition, a roller 380 for guiding the movement of the bogie 200 may be installed at the second connecting portion 322.

The fixing wire 340 is installed to pass through the lower flange 325 and fix the position of the rotatably coupled rail piece 320. A support wheel on which one end of the fixing wire 340 is wound may be installed on the frame 101. The support wheel may be installed in the main pulley 102, and may be installed spaced apart from the main pulley 102. When the support wheel pulls the fixing wire 340, the rail pieces 320 may be firmly supported.

The lower flange 325 may be provided with a magnet 326 in contact with the rail pieces 320 facing each other, and accordingly, the adjacent rail pieces 320 may be more easily coupled.

On the other hand, there is a moving wire 120 for moving the bogie 200 is installed in the rail part 300, the rail piece 320 disposed at the foremost end of the rail piece 320, which supports the moving wire 120 A support wheel 360 is installed. A part of the moving wire 120 is disposed on the upper part of the rail part 300 and connected to the bogie 200, and the other part of the moving wire 120 is installed to penetrate the web part 324 and is wound around the sub pulley 103. I can lose. Accordingly, the bogie 200 may stably move along the moving wire 120.

3 is a view showing a balance according to the first embodiment of the present invention.

Referring to FIG. 3, the bogie 200 includes a guide arm 230 protruding from the side of the bogie body 210 and the bogie body 210, and a plurality of running rollers 240 installed under the bogie body 210. ) And is installed in the bogie body 210 and may include a transfer roller 250 for moving the pipe assembly 500.

The bogie body 210 has an approximately hexahedral shape, and a transfer roller 250 and a motor may be installed therein. The transfer roller 250 rotates in contact with the tube assembly 500 and a motor may be connected to the transfer roller 250. The pipe coupling body 500 can be advanced or reversed by the transfer roller 250, and accordingly, the length of the pipe coupling body 500 protruding toward the front of the bogie 200 is adjusted, and the inspection head 400 is moved to a desired position. Can be moved.

The guide arm 230 may be rotatably coupled to the bogie body 210. In addition, the guide arm 230 may have a structure in which the length is expandable and contractable by a cylinder. The guide arm 230 has a structure that is bent in an L-shape. The pipe coupling body 500 passes through the guide arm 230 and protrudes toward the tip of the guide arm 230, and is bent within the guide arm 230. In addition, a plurality of guide rollers 260 may be installed inside the guide arm 230 to support the pipe assembly 500 to be bent.

When the guide arm 230 rotates, the tube assembly 500 may protrude in a desired direction. That is, the pipe joint 500 may not only move in the direction of gravity, but may also move in a direction perpendicular to the direction of gravity or in a direction inclined to the direction of gravity.

A plurality of running rollers 240 rotating in contact with the rail unit 300 are installed under the bogie body 210, and the running rollers 240 may be connected to a motor to rotate. The bogie body 210 is installed with the moving wire 120, and when the traveling roller 240 does not operate due to a motor failure, the bogie 200 may be recovered by the moving wire 120.

4 is a view showing the inspection head and the pipe joint according to the first embodiment of the present invention, Figure 5 is a cross-sectional view of the pipe joint according to the first embodiment of the present invention.

Referring to FIGS. 4 and 5, the inspection head 400 has a substantially plate shape, and in the inspection head 400, a camera 410, light emitting devices 420 and 430, and a foreign material removing unit 450 Can be installed. Two light-emitting elements 420 and 430 may be installed in the inspection head 400, one light-emitting element 420 emits light when the camera 410 is operated, and the other light-emitting element 430 is a foreign material removal unit. When 450 is activated, it can emit light. The light emitting devices 420 and 430 may be formed of LEDs.

As shown in FIG. 6, the foreign material removing unit 450 may have a structure having a plurality of hooks 451, and when the foreign material removing unit 450 is pulled, the distance between the tips of the hooks 451 decreases, The removal unit 450 may separate and collect impurities from the heat transfer tube.

In addition, as shown in FIG. 7, the foreign material removing unit 460 may include a tongs 461, and when the foreign material removing unit 460 is pulled, the gap between the tongs decreases so that the tongs catch impurities or impurities in the heat transfer tube. Can escape.

4 and 5, the pipe assembly 500 is electrically connected to the inspection head 400 and is fixed to the protection tube 510 and the protection tube 510 for transmitting current and data to the inspection head 400 It may include a reinforced cable 520.

The pipe assembly 500 is installed to be movable with respect to the bogie 200 and moves the inspection head 400. The pipe assembly 500 may be installed to pass through the bogie 200 and may be wound around the frame 101. In addition, the pipe joint 500 may be wound and installed inside the bogie 200.

The protection tubes 510 and the reinforcing cables 520 are arranged on one virtual plane, and accordingly, the tube assembly 500 may be formed in an approximately flat belt shape. When the protective tubes 510 and the reinforcing cables 520 are arranged on a virtual plane, the tube assembly 500 may be more easily bent.

The pipe assembly 500 includes four protective pipes 510, and a wire 550 for transmitting current and data is inserted and installed in the protective pipe 510. The protective tube 510 is made of a flexible tube and may be formed of a coil in which a wire is wound in a spiral shape.

The protective pipes 510 are fixed to each other by a joint 530, and the joint 530 may be formed of a welding portion formed by welding. The bonding portion 530 may be formed by laser welding, and may be formed of a point spaced apart from the adjacent bonding portion 530.

A plurality of joint portions 530 are formed in one protective pipe 510, and the joint portions 530 may be spaced apart at predetermined intervals in the longitudinal direction of the protective pipe 510. In addition, the junction 530 fixing the adjacent protective tube 510 may be disposed in a direction perpendicular to the longitudinal direction of the protective tube 510.

The reinforced cable 520 may be made of a coil in which a wire is wound in a spiral shape, and a wire is not inserted into the reinforced cable 520. The reinforced cable 520 may be fixed to the protection tube 510 by a joint 530 formed by welding.

The pipe joint 500 may include two reinforced cables 520, and the reinforced cable 520 is disposed on the outermost side of the pipe joint 500. The reinforced cable 520 is fixed to the protective tube 510 disposed on the outside. The joints 530 formed on the reinforcing cable 520 may be spaced apart from each other in the longitudinal direction of the reinforcing cable 520, and the reinforcing cable 520 improves the rigidity of the pipe joint.

Since the pipe assembly 500 must be bent according to the rotation of the guide arm 230, it must not only be flexible, but also have strength in order to move the inspection head 400 in a linear direction inside the steam generator.

As in the first embodiment, when the pipe joint 500 includes the protective pipes 510 fixed by the joint 530, and the protective pipes 510 are made of a coil, the pipe joint 500 may have flexibility. In addition, it has strength and can easily move the inspection head 400 in a linear direction.

In order to move the inspection head 400 in a desired direction, the pipe assembly 500 must be easily bent according to the rotation of the guide arm 230, and the heat transfer pipe 26 located inside the steam generator 20 is inspected. In order for the pipe joint 500 to have strength and not bend. When a flexible circuit board is used, since the flexible circuit board does not have strength, the flexible circuit board may bend without overcoming the weight of the test head.

In the first embodiment, joints 530 are formed at predetermined intervals on a plurality of protection tubes 510 made of coils, so that not only can the inspection head move in the direction of gravity but also the direction inclined to the direction of gravity by providing flexibility and straightness. You can also move to.

In addition, when the pipe joint 500 includes a reinforced cable 520 fixed to the protective pipe 510, the strength of the pipe joint 500 may be further improved. In addition, since the plurality of joints 530 are spaced apart in the longitudinal direction of the protective pipe 510 at preset intervals, even if the pipe joint 500 is elongated, it is possible to prevent the pipe joint from bending due to the weight of the inspection head 400. have.

Hereinafter, an apparatus for inspecting a heat transfer pipe according to a second embodiment of the present invention will be described. 8 is a view showing a pipe joint according to a second embodiment of the present invention.

Referring to FIG. 8, the heat transfer pipe inspection apparatus according to the second embodiment has the same structure as the heat transfer pipe inspection apparatus according to the first embodiment, except for the pipe joint 600, so that the same configuration is duplicated. Description is omitted.

The tube assembly 600 may include a protection tube 610 for transmitting current and data to the test head and a reinforced cable 620 fixed to the protection tube 610. The pipe assembly 600 includes four protective pipes 610 and two reinforced cables 620, and a wire for transmitting current and data may be inserted and installed in the protective pipe 610. The protective tube 610 and the reinforcing cable 620 may be formed of a flexible tube and may be formed of a coil wound in a spiral shape.

The protective tube 610 and the reinforcing cable 620 are fixed to each other by a bonding portion 630, and the bonding portion 630 may be made of an adhesive material. Here, the adhesive material may be made of a polymer. However, the present invention is not limited thereto, and the joint 630 may be formed by welding. The junction 630 may be formed of a point spaced apart from an adjacent junction. A plurality of joints 630 may be spaced apart at predetermined intervals in the longitudinal direction of the pipe joint.

Here, the first bonding portion 631 formed at one side end of any one of the protection tube 610 and the second bonding portion 632 formed at the other side end may be spaced apart from each other in the longitudinal direction of the protection tube 610. That is, the joints 630 adjacent in the width direction of the pipe joint 600 are spaced apart from each other in the longitudinal direction of the pipe joint 600. The junction part 630 includes a first junction part 631 and a second junction part 632, wherein the first junction parts 631 are spaced apart in the width direction of the pipe joint 600, and between the first junction parts 631 The positioned second joint 632 is spaced apart from the first joint 631 in the longitudinal direction of the pipe joint 600.

If the joint portions 630 adjacent to each other in the width direction of the pipe joint 600 are disposed spaced apart from each other in the longitudinal direction of the pipe joint 600 as in the second embodiment, the straightness of the pipe joint 600 may be further improved.

Hereinafter, an apparatus for inspecting a heat transfer pipe according to a third embodiment of the present invention will be described. 9 is a view showing a pipe joint according to a third embodiment of the present invention.

Referring to FIG. 9, the heat transfer pipe inspection apparatus according to the third embodiment has the same structure as the heat transfer pipe inspection apparatus according to the first embodiment, except for the pipe assembly 700, so that the same configuration is duplicated. Description is omitted.

The tube assembly 700 may include a protection tube 710 for transmitting current and data to the test head and a reinforced cable 720 fixed to the protection tube 710. The pipe assembly 700 includes four protective pipes 710 and two reinforced cables 720, and a cable for transmitting current and data is inserted and installed in the protective pipe 710. The protective tube 710 and the reinforcing cable 720 may be formed of a flexible tube and may be formed of a coil in which a wire is wound in a spiral shape.

The protection tube 710 and the reinforcing cable 720 are fixed to each other by a bonding portion 730, and the bonding portion 730 may be formed of a welding portion formed by welding. The joint portion 730 may be formed by laser welding, and may be formed of a line extending from one side end of the pipe joint 700 to the other side end.

Here, the direction in which the junction 730 is connected and the width direction perpendicular to the longitudinal direction of the pipe joint 700 may be formed to be inclined at a predetermined inclination angle A1. Here, the inclination angle A1 may be 30 degrees to 60 degrees.

When the junction part 730 is formed in a line as in the third embodiment, the protection tubes 710 and the reinforced cable 720 may be more stably fixed. In addition, when the direction in which the joint 730 is connected and the width direction of the pipe joint 700 are arranged to be inclined, the pipe joint 700 may be more easily bent.

Hereinafter, an apparatus for inspecting a heat transfer pipe according to a fourth embodiment of the present invention will be described. 10 is a view showing a pipe joint according to a fourth embodiment of the present invention.

Referring to FIG. 10, the heat transfer pipe inspection apparatus according to the fourth embodiment has the same structure as the heat transfer pipe inspection apparatus according to the first embodiment, except for the pipe assembly 800, so that the same configuration is duplicated. Description is omitted.

The tube assembly 800 may include a protection tube 810 for transmitting current and data to the test head and a reinforced cable 820 fixed to the protection tube 810. The pipe assembly 800 includes four protective pipes 810 and two reinforced cables 820, and a wire for transmitting current and data is inserted and installed in the protective pipe 810. The protective tube 810 is made of a flexible tube and may be formed of a coil in which a wire is wound in a spiral shape.

The protective tube 810 and the reinforcing cable 820 are fixed to each other by a bonding portion 830, and the bonding portion 830 may be formed by welding. The junction 830 may be formed of a point spaced apart from the neighboring junction 830. A plurality of joint portions 830 may be spaced apart from each other at predetermined intervals in the longitudinal direction of the pipe joint 800.

The reinforced cable 820 may be made of a metal wire filled with the inside, and may have greater rigidity and less flexibility than the protection tube 810. In addition, the reinforced cable 820 may have a smaller diameter than the protective tube 810. The reinforcing cables 820 are disposed on the outer side of the tube assembly 800 in the width direction, respectively, and may be fixed to the protection tube 810 disposed on the outermost side through the bonding portion 830.

When a reinforced cable 820 having a larger rigidity and a smaller diameter than the protection tube 810 is fixedly installed on the outside of the protection tube 810 as in the fourth embodiment, the straightness of the tube assembly 800 is further improved while the tube assembly 800 can be easily bent.

Hereinafter, an apparatus for inspecting a heat transfer pipe according to a fifth embodiment of the present invention will be described. 11 is a view showing a pipe joint according to a fifth embodiment of the present invention.

Referring to FIG. 11, the heat transfer pipe inspection apparatus according to the fifth embodiment has the same structure as the heat transfer pipe inspection apparatus according to the first embodiment, except for the pipe assembly 900, so that the same configuration is duplicated. Description is omitted.

The tube assembly 900 may include a protection tube 910 that transmits current and data to the test head and a reinforced cable 920 fixed to the protection tube 910. The pipe assembly 900 includes four protective pipes 910 and two reinforced cables 920, and a wire for transmitting current and data is inserted and installed in the protective pipe 910. The protective tube 910 is made of a flexible tube and may be formed of a coil in which a wire is wound in a spiral shape.

The protective tubes 910 are fixed to each other by a first joint 931, and the first joint 931 may be formed by welding. The first junction 931 may be formed of a point spaced apart from the neighboring first junction 931. The plurality of first joints 931 may be spaced apart from each other at predetermined intervals in the longitudinal direction of the pipe joint 900.

The reinforced cable 920 may be made of a polymer material and may have a structure filled with the inside. The reinforced cable 920 may have greater rigidity and less flexibility than the protective tube 910. The reinforcing cables 920 may be disposed outside the pipe joint in the width direction, and may be fixed to the protective pipe 910 disposed on the outermost side through the second joint 932.

The reinforced cable 920 has a coupling groove 921 into which the side of the protective tube is inserted, and the coupling groove 921 may be curved in an arc shape. In addition, a surface of the reinforcing cable 920 facing the opposite direction to the coupling groove 921 may be formed as a flat surface. The second joint portion 932 is formed by melting of the reinforcing cable 920 and the reinforcing cable 920 is melt-bonded to the protective tube. The plurality of second bonding portions 932 may be spaced apart from each other in the longitudinal direction of the reinforcing cable 920.

When the reinforced cable 920 made of a polymer is fixedly installed on the outside of the protective tube 910 as in the fifth embodiment, the tube assembly 900 can be easily bent while further improving the straightness of the tube assembly 900. In addition, since the coupling groove 921 is formed in the reinforcing cable 920, damage to the protective tube 910 may be prevented by the reinforcing cable 920.

As described above, one embodiment of the present invention has been described, but those of ordinary skill in the relevant technical field add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. Various modifications and changes can be made to the present invention by means of the like, and it will be said that this is also included within the scope of the present invention.

10: Heat transfer pipe inspection device
20: steam generator
21: outer wall
24: outer space
25: hand hole
26: insulation tube
100: drive unit
101: frame
102: main pulley
103: sub pulley
200: Balance
210: bogie body
230: guide arm
240: running roller
250: transfer roller
260: guide roller
300: rail part
320: rail piece
340: fixed wire
400: inspection head
410: camera
420, 430: light emitting device
450: foreign matter removal unit
500, 600, 700, 800, 900: pipe joint
510, 610, 710, 810, 910: sheath
520, 620, 720, 820, 920: reinforced cable
530, 630, 730, 830: junction
550: wire

Claims (15)

In the heat transfer pipe inspection device for inspecting foreign substances inside the steam generator,
A rail part inserted into the steam generator;
An inspection head including a camera and a light emitting element;
A cart installed to be movable along the rail part and moving the inspection head; And
A pipe joint electrically connected to the test head and including a plurality of flexible protective pipes;
Including,
The protective pipes are fixed to the neighboring protective pipes by a plurality of joints, wherein the joints are spaced apart in the longitudinal direction of the pipe joint. The method of claim 1,
The protective tube is a heat transfer tube inspection device made of a coil spring. The method of claim 2,
The joint portion is a heat transfer pipe inspection apparatus consisting of a welding portion in which the protective pipes are formed by welding. The method of claim 1,
The protective tubes are arranged on one virtual plane,
The pipe assembly penetrates the bogie, protrudes from the front end of the bogie, and is installed to move relative to the bogie. The method of claim 1,
The heat transfer pipe inspection apparatus consisting of a point at which the junction is joined to neighboring protective pipes. The method of claim 1,
A heat transfer pipe inspection apparatus, wherein a junction formed at one side end of one of the protection tubes and a junction formed at the other side end are spaced apart in the longitudinal direction of the protection tube. The method of claim 1,
The connection part is a heat transfer pipe inspection apparatus consisting of a line extending from one side end of the pipe joint to the other side end. The method of claim 1,
In the inside of the protection tube, a cable for transmitting current or signal is inserted and installed, and the tube assembly is disposed outside the protection tube to reinforce the strength of the tube assembly and inspect a heat transfer pipe including a reinforced cable connected in the longitudinal direction of the protection tube. Device. The method of claim 8,
The reinforced cable is a heat transfer tube inspection device made of a hollow coil. The method of claim 8,
The reinforced cable is made of a polymer, and the heat transfer tube inspection device melt-bonded to the protective tube. The method of claim 10,
The reinforced cable has a groove into which the protection tube is inserted, and a heat transfer tube inspection device for inserting and supporting the protection tube disposed on the outermost side. The method of claim 8,
The reinforced cable has a greater stiffness than the protection tube and has a smaller diameter than the protection tube. The method of claim 1,
A heat transfer pipe inspection apparatus further comprising a main pulley wound by the rail part, wherein the rail part is separated from the main pulley when the main pulley rotates and inserted in an arc shape in a circumferential direction of the steam generator. The method of claim 1,
The rail unit includes a plurality of rail pieces hingedly connected to each other and a fixing wire for fixing the plurality of rail pieces,
The rail piece is an upper flange provided with first and second connection portions on both sides to enable hinge connection with an adjacent rail piece, and a web portion protruding downward from the upper flange, and is fixed to a lower end of the web portion and faces the upper flange. It includes a lower flange that,
The fixed wire is a heat transfer pipe inspection device installed to pass through the lower flange. The method of claim 1,
The bogie is rotatable with respect to the bogie body and the body portion and a plurality of running rollers installed under the bogie body and rotating in contact with the rail, and the transfer roller rotating in contact with the tube assembly and moving the tube assembly. It includes a guide arm that is coupled to each other,
The pipe joint is a heat transfer pipe inspection device protruding from the tip of the guide arm.

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