阅读说明：本技术 蒸汽发生器检查装置 (Steam generator inspection device ) 是由 杨星圭 金在镐 朴钟熙 金德镒 于 2020-04-21 设计创作，主要内容包括：本发明涉及一种能够对导热管束的缝隙中是否有异物存在等进行检查的蒸汽发生器检查装置。为了解决如上所述的课题,适用本发明的一实施例提供一种蒸汽发生器检查装置,包括：凸缘,安装在蒸汽发生器的手孔上；框架,安装在上述凸缘上；滑轮,安装在上述框架上；导向轨道,通过上述手孔沿着上述蒸汽发生器内部的导热管束的外侧进行安装；移动部,缠绕在上述滑轮上,可在上述导向轨道上进行移动；驱动部,用于对上述滑轮进行驱动；以及,摄像头部,以可在上述导热管束之间前进后退的方式安装在上述移动部上。(The present invention relates to a steam generator inspection device capable of inspecting whether or not foreign matter is present in a gap of a heat transfer pipe bundle. In order to solve the above-mentioned problem, an embodiment to which the present invention is applied provides a steam generator inspection apparatus including: a flange installed on a hand hole of the steam generator; a frame mounted on the flange; a pulley mounted on the frame; a guide rail installed along an outer side of the heat conduction pipe bundle inside the steam generator through the hand hole; a moving part wound on the pulley and capable of moving on the guide rail; a driving unit for driving the pulley; and a camera head mounted on the moving part so as to be movable forward and backward between the heat transfer tube bundles.)

1. A steam generator inspection device comprising:

a flange installed on a hand hole of the steam generator;

a frame mounted on the flange;

a pulley mounted on the frame;

a guide rail installed along an outer side of the heat conduction pipe bundle inside the steam generator through the hand hole;

a moving part wound around the pulley and capable of moving on the guide rail;

a driving unit for driving the pulley; and the number of the first and second groups,

and an imaging head unit attached to the moving unit so as to be able to move forward and backward between the heat transfer tube bundles.

2. The steam generator inspection device of claim 1, wherein:

the guide rail is installed along an outer side of the heat transfer tube bundle facing the partition plate inside the steam generator.

3. The steam generator inspection device of claim 2, wherein:

the guide rail is formed in a straight line.

4. The steam generator inspection device of claim 2,

further comprising:

and a bracket mounted on the flange for fixing the guide rail.

5. The steam generator inspection device of claim 2, wherein:

the moving part includes:

a moving body formed by a plurality of moving units hinged to each other; and the number of the first and second groups,

and a plurality of rollers coupled to the moving body and moving on the guide rail.

6. The steam generator inspection device of claim 5, wherein:

the camera head is rotatably attached to the moving section.

7. The steam generator inspection device of claim 6, wherein:

the camera head includes:

a cable;

a probe coupled to a front of the cable; and the number of the first and second groups,

and the 1 st camera is arranged on the probe towards the front.

8. The steam generator inspection device of claim 7,

the camera head further includes:

and the 2 nd camera is arranged on the probe towards the side surface.

9. The steam generator inspection device of claim 7, wherein:

each of the plurality of moving units includes a pair of plates disposed to face each other, each of the plates having 2 pin holes,

the plurality of moving means are arranged so that one pin hole overlaps between adjacent plates, and are connected to each other by a plurality of pins that are coupled to penetrate through pin holes facing each other.

10. The steam generator inspection device of claim 9,

further comprising a head coupled to any one of the plurality of pins,

the cable passes through the head.

11. The steam generator inspection device of claim 10, wherein:

the pin is integrally formed with the head.

12. The steam generator inspection device of claim 7,

further comprising:

a pair of roller parts installed on the moving part, the cable passing through the pair of roller parts.

13. The steam generator inspection device of claim 5,

further comprising:

and a direction switching part mounted on the moving part for switching the direction of the moving part.

14. The steam generator inspection device of claim 13, wherein:

the direction converting part includes:

a link coupled to a front of the moving part; and the number of the first and second groups,

and the actuating mechanism is connected with the connecting rod.

15. The steam generator inspection device of claim 5,

further comprising:

and a position fixing part mounted on the moving part for fixing the position of the moving part.

16. The steam generator inspection device of claim 15, wherein:

the position fixing portion is capable of extending and contracting in a direction approaching or separating from the dividing plate.

17. The steam generator inspection device of claim 16, wherein:

the position fixing part is made of rubber.

18. The steam generator inspection device of claim 13,

the height of the inspection device is 30mm or less.

Technical Field

The present invention relates to a steam generator inspection device, and more particularly, to a steam generator inspection device (inspection device) capable of inspecting whether foreign matter exists in a gap of a heat pipe bundle.

Background

Generally, a nuclear power plant generates steam required for producing electricity using a steam turbine and a generator through a steam generator.

The steam generator is provided with a plurality of heat transfer pipes in a bundle (bundle) form, and the heat transfer pipes perform heat exchange between the class 1 system water including radiant energy and the class 2 system water for driving the turbine to rotate, thereby performing a function of separating the class 1 system water and the class 2 system water.

During the steam generation process of the steam generator, the class 1 system water heated in the process of passing through the atomic furnace flows through the interior of the heat conduction pipe of the steam generator along the pipeline, and the class 2 system water supplied to the exterior of the heat conduction pipe realizes the heat exchange between the class 1 system water and the class 2 system water by taking the pipe wall of the heat conduction pipe as a boundary in the process of crossing the exterior of the electric heating pipe. The stage 1 system water, which has undergone heat exchange by the process described above, will be recirculated to the atomic furnace along a closed loop pipeline, while the stage 2 system water will be converted to steam.

In the steam generator as described above, since the high-temperature and high-pressure radioactive water (level 1 system water) flows through the electric heating tube and the non-radioactive water (level 2 system water) flows through the outside of the electric heating tube, when the electric heating tube is damaged, the radioactive water (level 1 system water) penetrating the electric heating tube leaks to the outside and is mixed with the non-radioactive water (level 2 system water), which causes a serious problem that the entire area supplied after the non-radioactive water (level 2 system water) is converted into steam is contaminated by radioactive energy. Therefore, ensuring the soundness of the heat transfer pipe is an important issue that needs to be considered most advanced in the operation of the nuclear power plant.

However, although the 2-stage system water for steam generation in the conventional steam generator is supplied after being filtered and chemically treated, foreign substances and precipitates generated through various routes may flow into the inside of the steam generator during the internal circulation of the pipe, and the foreign substances flowing or generated through various routes as described above may be fouled on the outer surface of the heat transfer pipe and cause a reduction in heat exchange capacity and damage of the heat transfer pipe.

Therefore, removing the scale on the surface of the heat transfer pipe is a necessary means for ensuring the efficiency of the steam generator and the soundness of the heat transfer pipe, and it is necessary to manually perform work using a small endoscope camera in order to confirm the surface state of the heat transfer pipe.

However, in the above-described device, the endoscope camera is inserted into the heat pipe slit through the guide rail by the manual operation of the operator, and the operator must repeatedly perform the troublesome work of inserting and removing the endoscope camera for confirmation, and it is difficult to find a desired position for confirmation, and there is a high possibility that there is a portion that is not confirmed.

Further, the periphery of the steam generator belongs to a high radiation region, which causes exposure of workers to radiation, and thus it is difficult to effectively perform a visual inspection or a foreign matter removal work.

Disclosure of Invention

The present invention relates to a steam generator inspection device capable of inspecting whether or not foreign matter is present in a gap of a heat transfer pipe bundle.

The technical problem to be solved by the present invention is not limited to the technical problems mentioned in the above, and those having ordinary knowledge in the technical field to which the present invention belongs will be able to further clearly understand other technical problems not mentioned through the following description.

In order to solve the above-mentioned problem, an embodiment to which the present invention is applied provides a steam generator inspection apparatus including: a flange installed on a hand hole of the steam generator; a frame mounted on the flange; a pulley mounted on the frame; a guide rail installed along an outer side of the heat conduction pipe bundle inside the steam generator through the hand hole; a moving part wound on the pulley and capable of moving on the guide rail; a driving unit for driving the pulley; and a camera head mounted on the moving part so as to be movable forward and backward between the heat transfer tube bundles.

In an embodiment to which the present invention is applied, the guide rail may be attached along an outer side of the electric heat pipe bundle facing the partition plate inside the steam generator.

In an embodiment to which the present invention is applied, the guide rail may be formed in a straight line.

In an embodiment to which the present invention is applied, the method can further include: and a bracket mounted on the flange for fixing the guide rail.

In an embodiment to which the present invention is applied, the moving unit may include: a moving body hinge-connected to each other by a plurality of moving units; and a plurality of rollers coupled to the moving body and moving on the guide rail.

In an embodiment to which the present invention is applied, the camera head may be rotatably attached to the moving portion.

In an embodiment to which the present invention is applied, the camera head may include: a cable; a probe coupled to a front of the cable; and a 1 st camera which is installed on the probe facing forward.

In an embodiment to which the present invention is applied, the camera head may further include: and the 2 nd camera is arranged on the probe towards the side surface.

In an embodiment to which the present invention is applied, each of the plurality of mobile units may include: a pair of plates disposed in a mutually facing manner; wherein each of the plates is provided with 2 pin holes, and the plurality of moving means are arranged such that one pin hole of each of adjacent plates overlaps, and are connected to each other by a plurality of pins coupled to penetrate through the pin holes facing each other.

In an embodiment to which the present invention is applied, the method can further include: a head portion coupled to one of the plurality of pins; wherein the cable can pass through the head.

In an embodiment to which the present invention is applied, the pin may be formed integrally with the head.

In an embodiment to which the present invention is applied, the method can further include: a pair of roller parts installed on the moving part for the cable to pass through.

In an embodiment to which the present invention is applied, the method can further include: and a direction switching part mounted on the moving part for switching the direction of the moving part.

In an embodiment to which the present invention is applied, the direction converting unit may include: a link coupled to a front of the moving part; and an actuator connected to the link.

In an embodiment to which the present invention is applied, the method can further include: and a position fixing part mounted on the moving part for fixing the position of the moving part.

In an embodiment to which the present invention is applied, the position fixing portion is capable of expanding and contracting in a direction toward and away from the dividing plate.

In an embodiment to which the present invention is applied, the position fixing portion may be made of a rubber (rubber) material.

In an embodiment to which the present invention is applied, the height of the inspection apparatus may be 30mm or less.

In the present invention, the moving part can be moved forward and backward by the driving part on the guide rail installed along the outside of the heat transfer tube bundle inside the steam generator, and the position of the moving part can be easily fixed by the position fixing part. After the position of the moving portion is fixed, the camera head can be moved forward and backward between the heat pipe bundles, so that whether foreign matter exists in the gaps of the heat pipe bundles or not can be easily checked.

In addition, the inspection can be performed not only on the linear portion by moving the moving portion along the outer side of the heat transfer tube bundle facing the partition plate inside the steam generator, but also on the curved portion by switching the direction of the moving portion.

Therefore, the visual inspection can be effectively performed while avoiding exposure of the worker to a high radiation region.

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

Drawings

Fig. 1 is a sectional view illustrating a steam generator for mounting a steam generator inspection device to which the present invention is applied.

Fig. 2 is an oblique view of a state in which a steam generator inspection device to which an embodiment of the present invention is applied is mounted in a steam generator, viewed from the outside of the steam generator.

Fig. 3 is a side view of a state in which a steam generator inspection device to which an embodiment of the present invention is applied is mounted in a steam generator, viewed from the inside of the steam generator.

Fig. 4 is another side view of the steam generator inspection device of fig. 3.

Fig. 5 is an oblique view of the steam generator inspection device of fig. 4.

Fig. 6 is an oblique view showing the moving body separated from fig. 5.

Fig. 7 is another side view showing a part of fig. 4 in an enlarged manner.

Fig. 8 is a side view illustrating a state in which the moving portion in fig. 3 moves forward.

Fig. 9 is a side view illustrating a state in which the moving portion in fig. 8 moves forward.

[ notation ] to show

10: steam generator

12: hand hole

20: heat conduction pipe bundle

30: partition plate

100: flange

120: frame structure

140: support frame

200: pulley wheel

300: driving part

400: wire track

500: moving part

520: movable main body

522: board

524: pin

526: connecting piece

540: multiple rollers

600: camera head

610: cable with a flexible connection

620: probe head

630: 1 st camera

640: 2 nd camera

650: a pair of roller parts

660: head part

700: position fixing part

800: direction changing part

820: connecting rod

840: actuating mechanism

842: output shaft

Detailed Description

Next, preferred embodiments of a steam generator inspection device to which the present invention is applied will be described with reference to the accompanying drawings.

Furthermore, the terms used hereinafter are defined in consideration of the functions of the present invention, and may be changed according to the intention of a user or a common practice, and the following embodiments are not intended to limit the scope of the claims of the present invention, but are merely illustrative of the constituent elements disclosed in the claims of the present invention.

In order to clearly explain the present invention, portions that are not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification. Throughout the specification, when it is described that a certain portion "includes" a certain constituent element, unless explicitly stated to the contrary, it does not mean that other constituent elements are excluded, but means that other constituent elements can be further provided.

The steam generator inspection apparatus according to an embodiment of the present invention is installed through the hand hole 12 of the steam generator 10, and more specifically, the moving part 500 moves between the electric heating tube bundle 20 and the dividing plate 30 in the steam generator along the guide rail 400, and the camera head 600 moves forward and backward between the electric heating tube bundle 20, thereby inspecting whether there is a foreign object in the gap between the electric heating tube bundles.

Next, referring to fig. 1 to 9, a steam generator inspection apparatus to which an embodiment of the present invention is applied can generally include: the image pickup device includes a flange 100, a frame 120, a pulley 200, a driving unit 300, a guide rail 400, a moving unit 500, and an image pickup head 600.

As shown in fig. 2, it is possible to install a flange 100 on the hand hole 12 of the steam generator and to install a frame 120 on the flange 100. The frame 120 can be fixedly mounted to the hand hole 12 of the steam generator through the flange 100, and the frame 120 is mounted to the outside of the steam generator 10.

A pulley 200 is rotatably mounted to the frame 120, and the pulley 200 is rotatable by a driving unit 300. In a different embodiment, the driving unit 300 may be a servo motor (servo motor), and in this case, the position (moving distance) of the moving unit 500 may be controlled by receiving a control signal of the driving unit 300 and driving the pulley 200.

The guide rail 400 is installed along the outside of the heat conduction pipe bundle 20 inside the steam generator through the hand hole 12. In particular, as shown in fig. 3, the guide rail 400 may be installed along the outer side of the heat transfer tube bundle 20 facing the partition plate 30 inside the steam generator. Thereby, the moving part 500 can move between the heat transfer tube bundle 20 and the partition plate 30 in the steam generator through the guide rail 400.

In the present embodiment, the guide rail 500 is formed in a straight line. That is, the guide rail 400 may be mounted to a straight section corresponding to the section a of the steam generator 10 illustrated in fig. 1.

In various embodiments, it can further include: the bracket 140 is attached to the flange 100 to fix the guide rail 400.

The moving part 500 is wound around the pulley 200 and can move on the guide rail 400. When the pulley 200 is rotated by the driving part 300 to release the moving part 500, the moving part 500 moves forward in the inner direction of the steam generator, and when the moving part 500 is wound, the moving part 500 moves backward in the outer direction of the steam generator.

Specifically, referring to fig. 3 to 6, the moving unit 500 may include: a moving body 520 hinged to each other by a plurality of moving units; and a plurality of rollers 540 coupled to the moving body 520 and moving on the guide rail 400. As described above, the moving body 520 may be configured by a plurality of moving units hinged to each other to perform direction conversion, so that the moving unit may move in a linear section and a curved section. That is, the moving part 500 can move to the section a and the section B of the mounting guide rail 400 in the steam generator 10 illustrated in fig. 1. The plurality of rollers 540 may be installed in pairs along the guide rail 400 at both sides of the moving body 520.

In this embodiment, the plurality of mobile units may include: a pair of plates 522 arranged in a mutually facing manner; each of the plates 522 has 2 pin holes, and the plurality of moving means are arranged so that one pin hole of each of the adjacent plates 522 overlaps, and are connected to each other by a plurality of pins 524 coupled to penetrate through the pin holes facing each other.

Specifically, in the present embodiment, the moving body 520 is formed of a roller chain (rollerchain). The moving body 520 may include a roller, a sleeve, and the like in addition to the plate 522 and the pin 524.

At this time, a pair of plates disposed at the outside among the plurality of moving units is provided with a coupling member, so that the plurality of rollers 540 can be coupled to the moving body 520 through the coupling member 526.

An image pickup unit 600 that can move forward and backward between the heat conduction tube bundles 20 is attached to the moving unit 500.

Specifically, as shown in fig. 7, the camera head 600 includes: a cable 610; a probe 620 coupled to the front of the cable 610; and a 1 st camera 630 attached to the probe 620 so as to face forward.

The cable 610 is wound around a separate pulley disposed outside the steam generator 10 and wound or unwound according to the rotation of the pulley, so that the probe 610 moves forward and backward. In various embodiments, a pulley for winding the cable 610 can also be mounted on the frame 120.

A pair of rollers 650 may be installed in front of the moving part 500, and specifically, in the present embodiment, the pair of rollers 650 may be coupled to the foremost moving unit of the moving body 520 by a coupling 526. By passing the cable 610 through between the pair of rollers 650, the cable 610 can smoothly move forward and backward when the pair of rollers 650 rotate.

The 1 st camera 630 is attached to the probe 620 so as to face forward, and when the probe 620 moves forward and backward between the heat transfer pipe bundles 20, the 1 st camera 630 photographs the space between the heat transfer pipe bundles 20, so that the operator can check the presence or absence of foreign matter, damage, or the like between the heat transfer pipe bundles 20 with his/her eyes.

Further, in various embodiments, the camera head 600 may be rotatably mounted to the moving part 500. The invention also includes: a head part 660 coupled to one of the plurality of pins 524; the cable 610 may be disposed to penetrate the head 660. In the present embodiment, the pin 524 is integrally formed with the head 660.

This makes it possible to adjust the direction in which the cable enters between the heat conduction pipe bundles 20. That is, the cable 610 may enter at various angles as shown in fig. 9, not only in a direction perpendicular to the longitudinal direction of the moving body 520.

In addition, in a different embodiment, the camera head 600 may further include: the 2 nd camera 640 is installed on the probe 620 facing the side.

With this, when the camera 600 is hard to enter the line between the heat conduction pipe bundles 20 in which the tie rods (tie rod) are arranged in the steam generator 10, the line in which the tie rods are arranged can be inspected by the 2 nd camera 640 attached to the side surface while entering the nearby line.

In various embodiments, it can further include: and a position fixing part 700 attached to the moving part 500 for fixing the position of the moving part 500. The position fixing part 700 may be coupled to the moving body 520 by a coupling member 526.

The position fixing part 700 is capable of expanding and contracting in a direction approaching or separating from the dividing plate 30, and in the present embodiment, the position fixing part 700 is configured by a plurality of air tubes (air tubes). The position fixing portion 700 is preferably made of a rubber (rubber) material for protecting the partition plate 30.

As described above, after the moving portion 500 is moved, the position of the moving portion is fixed by the position fixing portion 700, and then the imaging head 600 is inserted between the heat exchanger tube bundles 20, thereby stably performing the inspection.

Furthermore, in various embodiments, it is also possible to include: and a direction switching unit 800 mounted on the moving unit 500 for switching the direction of the moving unit 500.

The direction converting unit 800 includes: a link 820 coupled to the front of the moving part 500; and an actuator 840 connected to the link 820. Specifically, in the present embodiment, the link 820 is coupled to the pair of roller parts 650, but the present invention is not limited thereto, and may be directly coupled to the moving body 520. The actuator 840 can be coupled to the moving body 520, and the link 820 is connected to an output shaft 842 of the actuator 840.

Accordingly, when the actuator 840 does not protrude the output shaft 842, the forward direction of the moving part 500 can be maintained to be straight by the link 820, but when the actuator 840 protrudes the output shaft 842, as shown in fig. 8, the link 820 is bent from the output shaft, and the forward direction of the moving part 500 is changed. Accordingly, when the moving unit 500 moves from the section a to the section B, the moving unit can easily move from the straight section to the curved section by switching the forward direction.

After the moving part 500 enters the B section, which is a curved section, as shown in fig. 9, the actuator 840 is re-driven so that the output shaft 842 is not protruded any more, thereby maintaining the straight-ahead movement of the moving part 500. In the curved section, the position of the moving part 500 can be fixed by the position fixing part 700.

When the moving unit 500 moves in the section a, the image pickup head 600 can move forward and backward in the direction perpendicular to the moving direction of the moving unit 500, i.e., the x direction shown in fig. 1, and inspect the space between the heat transfer pipe bundles 20.

At this time, when the moving unit 500 moves in the B section, the head 660 rotates to maintain the inspection direction of the image pickup head 600. That is, as shown in fig. 9, the cable 610 can be inserted in the x direction by adjusting the insertion direction of the cable 610 to rotate the head 660.

In order to allow the inspection device to be inserted between the partition plate 30 and the heat transfer tube bundle 20 of the steam generator and smoothly moved and inspected, the height of the inspection device can be limited. In particular, the height from the guide rail 400 to the highest member excluding the position fixing portion 700 is preferably within 30 mm.

In the present embodiment, the height from the guide rail 400 to the direction changing portion 800 can be formed within 30 mm. However, the present invention is not limited thereto, and when the height of the pair of rollers 650 is higher than the height of the direction switching unit 800, the height from the guide rail 400 to the pair of rollers 650 may be formed within 30 mm.

At this time, the height from the guide rail 400 to the position fixing part 700 may be less than the distance between the partition plate 30 of the steam generator and the heat transfer tube bundle 20 before the position fixing part 700 is stretched, and may be equal to or greater than the distance between the partition plate 30 of the steam generator and the heat transfer tube bundle 20 when the position fixing part 700 is stretched.

Further, the present invention may further include: and a control unit for controlling the inspection device. When the driving unit 300 is a servo motor, the control unit may control the position (moving distance) of the moving unit 500 by transmitting a control signal thereto and driving the pulley 200. The control unit can receive, store, and process images captured by the imaging head unit 600.

Next, a method of inspecting between heat transfer tube bundles of a steam generator by an inspection apparatus to which the present invention is applied will be briefly described.

First, an inspection device to which the present invention is applied is mounted through the hand hole 12 of the steam generator, and then the moving unit 500 is moved by driving the pulley 200, so that the inspection between the heat exchanger tube bundles 20 can be performed by advancing and retracting between the heat exchanger tube bundles 20 by the imaging head 600.

Specifically, in the steam generator 10 shown in fig. 1, after the moving part 500 enters the steam generator through the hand hole 12, the position thereof is fixed to each line corresponding to the space between the heat conduction pipe bundles 20 by the position fixing part 700, and after the fixing is completed, the camera head 600, specifically, the cable 610 is advanced to the space between the heat conduction pipe bundles 20 and inspected. After the inspection of one line is completed, the cable 610 is retracted and returned to an initial position, and then the moving part 500 is moved to the next line.

The region corresponding to 1/4 of the steam generator can be inspected each time the inspection device to which the present invention is applied is mounted on the hand hole 12 of the steam generator. That is, since the hand holes 12 of the steam generator are formed to face each other at both sides, after the 1/4 area is inspected by mounting the inspection device to one hand hole, the remaining 1/4 area can be inspected by mounting the inspection device to the opposite hand hole. Next, the inspection is performed in the same manner after rotating the steam generator by 180 °, so that a total of 4 inspections can be performed on one steam generator.

In the present invention, the moving part 500 can be moved forward and backward by the driving part 300 on the guide rail 400 installed along the outside of the heat transfer tube bundle 20 inside the steam generator, and the position of the moving part can be easily fixed by the position fixing part 700. After the position of the moving part 500 is fixed, it is possible to easily check whether or not foreign matter is present in the gaps of the heat transfer pipes 20 by moving the imaging head part 600 forward and backward between the heat transfer pipe bundles.

Further, the inspection can be performed not only on the linear portion by moving the moving portion 500 along the outside of the heat transfer tube bundle 20 facing the dividing plate 30 inside the steam generator, but also on the curved portion by switching the direction of the moving portion 500.

Therefore, the visual inspection can be effectively performed while avoiding exposure of the worker to a high radiation region.

The present invention is not limited to the specific embodiments and descriptions described above, and those having ordinary skill in the art to which the present invention pertains can implement various modifications without departing from the gist of the present invention claimed in the claims, and the modifications described above are included in the scope of protection of the present invention.