JP5893833B2 - Heat transfer tube inspection device and inspection method - Google Patents

Description

  The present invention relates to a heat transfer tube inspection apparatus and an inspection method applied when inspecting a heat transfer tube of a heat exchanger.

  For example, a steam generator as a heat exchanger used in a pressurized water reactor (PWR) has a large number of heat transfer tubes formed in an inverted U shape, and both ends are connected to the tube plate in the body. Inserted and fixed. This heat transfer tube is inspected for its soundness. Such inspection requires visual inspection (VT inspection) and ultrasonic inspection (UT inspection) in order to confirm damage to the inner surface of the heat transfer tube when eddy current inspection (ECT) is detected. Done accordingly.

  Conventionally, the heat transfer tube inspection apparatus shown in Patent Document 1 or Patent Document 2 uses an heat transfer tube to insert an inspection probe into an inspection robot supported on the lower surface of the tube plate (the surface of the tube plate on the water chamber side). A cylindrical guide member for guiding is provided. Since the inspection robot is supported on the lower surface of the tube plate by a clamp mechanism inserted through the heat transfer tube, the position of the heat transfer tube is used as a reference. Since the guide member is provided in the inspection robot in consideration of the pitch of the heat transfer tubes, the guide member is disposed immediately below the heat transfer tubes in a state where the inspection robot is supported on the lower surface of the tube plate.

Japanese Patent No. 3137576 Japanese Patent Laid-Open No. 10-227765

  By the way, in particular, in the appearance inspection and the ultrasonic flaw detection inspection, the center axis of the inspection probe coincides with the center axis of the heat transfer tube, whereby an accurate inspection can be performed. However, when the guide member is mounted with a slight positional deviation with respect to the inspection robot, the center axis of the inspection probe inserted through the guide member is displaced from the center axis of the heat transfer tube. It becomes difficult to perform an accurate inspection in the ultrasonic flaw detection inspection.

  This invention solves the subject mentioned above, and aims at providing the inspection apparatus and inspection method of a heat exchanger tube which can match | combine the center axis | shaft of an inspection probe and a heat exchanger tube.

  In order to achieve the above object, a heat transfer tube inspection apparatus according to the present invention is provided with a fixing means fixed to a tube plate surface of a tube plate in which a heat transfer tube opens, and an inspection probe inserted into the heat transfer tube. A cylindrical guide member that is inserted and guided along its own central axis, and provided in the fixing means. The central axis of the guide member is parallel to the central axis of the guide member. Positioning members that are arranged at intervals based on the arrangement interval of the heat tubes and that can be fitted to the heat transfer tubes, and the positioning members along the central axis of the positioning members And a positioning member moving means for moving.

  According to this heat transfer tube inspection apparatus, the center axis of the positioning member coincides with the center axis of the fitted heat transfer tube by fitting the positioning member to the heat transfer tube. For this reason, the central axis of the guide member coincides with the central axis of the heat transfer tube to be inspected. As a result, the central axes of the inspection probe inserted and supported by the guide member and the heat transfer tube to be inspected can be matched.

  In the heat transfer tube inspection apparatus according to the present invention, the positioning member is configured as a fitting portion having a conical tapered surface, and the tapered surface of the heat transfer tube is moved along with the movement by the positioning member moving means. It is characterized by being fitted into the opening.

  According to this heat transfer tube inspection device, the conical tapered surface of the fitting portion is aligned with the true circular portion of the opening of the heat transfer tube, that is, with respect to the central axis of the heat transfer tube. It fits so that the central axis of a fitting part may correspond. Since this fitting part fits into the opening part of a heat exchanger tube, since the stroke of movement is comparatively short, size reduction of an apparatus can be achieved.

  In addition, the heat transfer tube inspection apparatus of the present invention is characterized by including an elastic member that elastically biases the fitting portion toward the heat transfer tube.

  According to this heat transfer tube inspection apparatus, the fitting portion abuts on the opening portion of the heat transfer tube while being given an elastic biasing force by the elastic member, so that its own perfect circle portion matches the opening portion of the heat transfer tube. The action to assist is assisted. As a result, the effect that the center axis of the fitting portion matches the center axis of the heat transfer tube can be remarkably obtained.

  In addition, the heat transfer tube inspection apparatus of the present invention includes a slide mechanism that supports the guide member and the positioning member so as to be slidable in directions orthogonal to the central axes.

  According to this heat transfer tube inspection apparatus, the positional deviation with respect to the fixing means can be absorbed by the sliding movement of the guide member and the positioning member.

  Further, the heat transfer tube inspection apparatus of the present invention includes a guide member moving means for moving the guide member along the central axis of the guide member, and around the opening of the heat transfer tube as the guide member moves. And a sealing material provided over the entire periphery of the tip of the guide member in a contact manner.

  According to this heat transfer tube inspection apparatus, the seal material at the tip of the guide member is around the opening of the heat transfer tube to be inspected and abuts against the tube plate surface of the tube plate, and guides the heat transfer tube to be inspected. The members are connected in a sealed state. As a result, for example, in an inspection in which water is filled in the heat transfer tube as a contact medium like an ultrasonic flaw detection inspection, there is no leakage of the water, so that accurate inspection data can be acquired.

  In the heat transfer tube inspection apparatus of the present invention, the positioning member moving means and the guide member moving means are configured in common.

  According to this heat transfer tube inspection device, each moving means is configured in common, so that the size of the device can be reduced and the manufacturing cost can be reduced.

  In the heat transfer tube inspection apparatus of the present invention, the guide member is formed to a length that supports the inspection probe therein.

  According to this heat transfer tube inspection apparatus, when inspecting the opening portion of the heat transfer tube to the tube plate, it is necessary to support the inspection probe at the position of the opening portion of the heat transfer tube. Therefore, if the guide member is formed to a length that supports the inspection probe therein, the inspection probe can be supported at the position of the opening of the heat transfer tube, so the opening portion of the heat transfer tube to the tube plate is inspected. In this case, accurate inspection data can be acquired.

  In order to achieve the above-mentioned object, the heat transfer tube inspection method of the present invention is provided with a fixing means fixed to a tube plate surface of a tube plate in which the heat transfer tube opens, and an inspection probe inserted into the heat transfer tube is provided. A cylindrical guide member that is inserted and guided along its own central axis, and provided in the fixing means. The central axis of the guide member is parallel to the central axis of the guide member. Positioning members that are arranged at intervals based on the arrangement interval of the heat tubes and that can be fitted to the heat transfer tubes, and the positioning members along the central axis of the positioning members A heat transfer tube inspection method using a heat transfer tube inspection device comprising: a positioning member moving means to be moved, wherein the fixing means is positioned so that the guide member is located immediately below the heat transfer tube to be inspected. The process of fixing to the tube plate surface, The positioning member is moved by the positioning member moving means and fitted to a heat transfer tube different from the heat transfer tube to be inspected, and the central axis of the guide member is set to the central axis of the heat transfer tube to be inspected And a step of inspecting the heat transfer tube by inserting the inspection probe into the heat transfer tube to be inspected through the guide member.

  According to this heat transfer tube inspection method, by fitting the positioning member to the heat transfer tube, the central axis of the positioning member coincides with the central axis of the fitted heat transfer tube. For this reason, the central axis of the guide member coincides with the central axis of the heat transfer tube to be inspected. As a result, the center axis of the inspection probe inserted through and supported by the guide member and the heat transfer tube to be inspected are aligned, and accurate inspection data can be acquired.

  Further, in the heat transfer tube inspection method of the present invention, the heat transfer tube inspection device includes a guide member moving means for moving the guide member along a central axis of the guide member, and the movement of the guide member. And a seal member provided over the entire circumference of the tip of the guide member so as to abut around the opening of the heat transfer tube, and the central axis of the guide member is the central axis of the heat transfer tube to be inspected The guide member is moved by the guide member moving means to bring the seal material into contact with the periphery of the opening of the heat transfer tube to be inspected, and the guide member is sealed against the heat transfer tube. Including a step of connecting in a state.

  According to this heat transfer tube inspection method, the seal material at the tip of the guide member is around the opening of the heat transfer tube to be inspected and abuts against the tube plate surface of the tube plate, and guides the heat transfer tube to be inspected. The members are connected in a sealed state. As a result, for example, in an inspection in which water is filled in the heat transfer tube as a contact medium like an ultrasonic flaw detection inspection, there is no leakage of the water, so that accurate inspection data can be acquired.

  According to the present invention, the central axes of the inspection probe and the heat transfer tube can be aligned.

FIG. 1 is a schematic sectional side view of a steam generator. FIG. 2 is a perspective view showing a heat transfer tube inspection apparatus according to an embodiment of the present invention. FIG. 3 is a schematic view showing a usage state of the heat transfer tube inspection apparatus according to the embodiment of the present invention. FIG. 4 is a side sectional view showing a probe support mechanism of the heat transfer tube inspection apparatus according to the embodiment of the present invention. FIG. 5 is an enlarged view of the probe support mechanism shown in FIG. FIG. 6 is a side sectional view showing the operation of the probe support mechanism of the heat transfer tube inspection apparatus according to the embodiment of the present invention. FIG. 7 is an enlarged view of the probe support mechanism shown in FIG.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic sectional side view of a steam generator. The steam generator 1 as a heat exchanger is used, for example, in a pressurized water reactor (PWR). The pressurized water reactor uses light water as a reactor coolant and neutron moderator. The pressurized water reactor sends primary cooling water to the steam generator 1 as high-temperature and high-pressure water that does not boil light water over the entire core. In the steam generator 1, the heat of the primary cooling water at high temperature and high pressure is transmitted to the secondary cooling water, and water vapor is generated in the secondary cooling water. Then, the steam generator is rotated by this steam to generate electricity.

  The steam generator 1 has a hollow cylindrical shape that extends in the up-down direction and is hermetically sealed, and has a trunk portion 2 in which the lower half is slightly smaller in diameter than the upper half. The trunk portion 2 is provided with a tube group outer cylinder 3 having a cylindrical shape disposed at a predetermined distance from the inner wall surface of the trunk portion 2 in the lower half portion thereof. The lower end portion of the tube group outer tube 3 extends to the vicinity of the tube plate 4 disposed below in the lower half of the body portion 2. A heat transfer tube group 5A is provided in the tube group outer tube 3. The heat transfer tube group 5A includes a plurality of heat transfer tubes 5 having an inverted U shape. Each heat transfer tube 5 is arranged with the U-shaped arc portion facing upward, the lower end portion is inserted and supported through the tube hole of the tube plate 4, and the intermediate portion is a tube through a plurality of tube support plates 6. It is supported by the group outer cylinder 3. The tube support plate 6 is formed with a large number of heat transfer tube insertion holes, and supports each heat transfer tube 5 by inserting each heat transfer tube 5 into the heat transfer tube insertion hole.

  The body 2 is provided with a water chamber 7 at its lower end. The interior of the water chamber 7 is divided into an entrance chamber 7A and an exit chamber 7B by a partition wall 8. One end of each heat transfer tube 5 communicates with the entrance chamber 7A, and the other end of each heat transfer tube 5 communicates with the exit chamber 7B. Further, the entrance chamber 7A is formed with an inlet nozzle 7Aa that communicates with the outside of the body portion 2, and the exit chamber 7B is formed with an exit nozzle 7Ba that communicates with the outside of the body portion 2. The inlet nozzle 7Aa is connected to a cooling water pipe (not shown) through which primary cooling water is sent from the pressurized water reactor, and the outlet nozzle 7Ba sends the primary cooling water after heat exchange to the pressurized water reactor. The cooling water piping (not shown) to send is connected.

  In the upper half of the body portion 2, an air-water separator 9 that separates feed water into steam and hot water, and a moisture separator that removes the moisture of the separated steam and makes it close to dry steam. 10 is provided. Between the steam / water separator 9 and the heat transfer tube group 5A, a water supply pipe 11 for supplying secondary cooling water from the outside into the body 2 is inserted. Furthermore, the trunk | drum 2 has the vapor | steam exhaust port 12 formed in the upper end part. Further, the body 2 has a tube plate in the lower half of which the secondary cooling water supplied from the water supply pipe 11 into the body 2 flows down between the body 2 and the tube group outer tube 3. 4, a water supply passage 13 is formed that is folded back and raised along the heat transfer tube group 5A. The steam outlet 12 is connected to a cooling water pipe (not shown) for sending steam to the turbine, and the water supply pipe 11 has two steams used in the turbine cooled by a condenser (not shown). A cooling water pipe (not shown) for supplying the next cooling water is connected.

  In such a steam generator 1, the primary cooling water heated in the pressurized water reactor is sent to the entrance chamber 7 </ b> A, circulates through the numerous heat transfer tubes 5, and reaches the exit chamber 7 </ b> B. On the other hand, the secondary cooling water cooled by the condenser is sent to the water supply pipe 11 and rises along the heat transfer pipe group 5 </ b> A through the water supply path 13 in the trunk portion 2. At this time, heat exchange is performed between the high-pressure and high-temperature primary cooling water and the secondary cooling water in the trunk portion 2. Then, the cooled primary cooling water is returned from the exit chamber 7B to the pressurized water reactor. On the other hand, the secondary cooling water subjected to heat exchange with the high-pressure and high-temperature primary cooling water rises in the body portion 2 and is separated into steam and hot water by the steam separator 9. The separated steam is sent to the turbine after moisture is removed by the moisture separator 10.

  The heat transfer tube 5 of the steam generator 1 is inspected at the same time when the operation of the core is periodically stopped for fuel replacement work after the steam generator 1 is put into service, for example. In this inspection, since the inside of the water chamber 7 is in a radiation atmosphere by directly touching the primary cooling water heated in the nuclear reactor, it is not preferable that the operator who performs the inspection stays in the water chamber 7 for a long time. . For this reason, an inspection device that performs an inspection by remote operation from the outside of the water chamber 7 is used.

  FIG. 2 is a perspective view showing a heat transfer tube inspection apparatus according to the present embodiment, and FIG. 3 is a schematic view showing a use state of the heat transfer tube inspection apparatus according to the present embodiment. As shown in FIG. 2, the inspection device 20 for the heat transfer tube 5 of the present embodiment is a fixing means that is fixed to the tube plate surface (the lower surface of the tube plate 4) in which the heat transfer tube 5 opens in the water chamber 7. A certain inspection robot 21 is provided. In addition, as a fixing means, it fixes to the tube plate surface (lower surface of the tube plate 4) which the heat exchanger tube 5 opens, For example, although not shown clearly in a figure, with the manipulator etc. which are arrange | positioned in the water chamber 7, etc. It may be present and is not limited to the inspection robot 21.

  As shown in FIG. 2, the inspection robot 21 has a circular substrate 211 provided with an X-axis direction walking device 212 and a Y-axis direction walking device 213 (two-dimensionally orthogonal X-axis along the tube sheet surface). Represented by the Y axis). The X-axis direction walking device 212 has three clamp shafts 212a. The clamp shaft 212a is inserted into the heat transfer tube 5 opened to the tube plate surface by the clamp cylinder 212b, and is expanded and fixed in the heat transfer tube 5, while the expansion is released by the clamp cylinder 212b and the heat transfer tube 5 is released. Extracted from. The X-axis direction walking device 212 includes an X-axis drive cylinder 212c. The X-axis drive cylinder 212c moves the two clamp shafts 212a by one pitch of the heat transfer tube 5 in the X-axis direction.

  Similarly, the Y-axis direction walking device 213 has three clamp shafts 213a. The clamp shaft 213a is inserted into the heat transfer tube 5 opened on the tube plate surface by the clamp cylinder 213b, and is expanded and fixed in the heat transfer tube 5, while the expansion is released by the clamp cylinder 213b and the heat transfer tube 5 is released. Extracted from. The Y-axis direction walking device 213 includes a Y-axis drive cylinder 213c. The Y-axis drive cylinder 213c moves the two clamp shafts 213a by one pitch of the heat transfer tube 5 in the Y-axis direction.

  The inspection robot 21 is provided with a plurality of (three in the present embodiment) guide rollers 214 on the substrate 211.

  The inspection robot 21 is provided with a turntable 215 on the outer periphery of the substrate 211. The turntable 215 is driven at a predetermined angle in the circumferential direction of the substrate 211 by the driving device 216. The turntable 215 is provided with a mounting plate 217. The attachment plate 217 is attached with an elevating mechanism 218. In the lifting mechanism 218, a lifting platform 218a is connected to a mounting plate 217 via a belt 218b. The belt 218b moves the elevator 218a up and down by the drive motor 218c. A probe support mechanism 22 that guides and supports an inspection probe 30, which will be described later, is attached to the lifting platform 218a.

  Such an inspection robot 21 uses the X-axis direction walking device 212 and the Y-axis direction walking device 213 as a stride of one pitch of the heat transfer tubes 5 arranged at a predetermined pitch on the tube plate 4 and is 2 along the tube plate surface. Walk in dimension. During this walking movement, the guide roller 214 is in contact with the tube sheet surface and guides the movement. Thereby, as shown in FIG. 3, since the inspection robot 21 is moved and fixed to an arbitrary position on the tube plate surface, the probe support mechanism 22 can be arranged at the position of the heat transfer tube 5 to be inspected. The predetermined inspection can be performed by inserting the inspection probe 30 into the heat transfer tube 5. In addition, since the probe support mechanism 22 is rotated as the rotating table 215 rotates as necessary, the inspection robot 21 can be disposed at the position of the heat transfer tube 5 to be inspected. The predetermined inspection can be performed by inserting the inspection probe 30 into the heat transfer tube 5. In order to send the inspection probe 30, the cable 30 a connected to the inspection probe 30 is pushed out by the pusher 23 a of the pusher device 23 shown in FIG. 3 arranged outside the water chamber 7. The cable 30a is wound around the take-up reel 23b of the pusher device 23. When the inspection probe 30 is sent out, the cable 30a is fed out from the take-up reel 23b. When the inspection probe 30 is pulled out from the heat transfer tube 5, the take-up reel 23b is pulled out. Rolled up.

  Prior to the inspection of the heat transfer tube 5, the inspection robot 21 is attached with a detachable long operation rod (not shown). The operator holds the operation rod, inserts it into the water chamber 7 from the manhole 7C, and positions it on the tube plate surface of the tube plate 4 immediately above the manhole 7C. Then, the inspection robot 21 inserts and clamps the clamp shafts 212a and 213a of the X-axis direction walking device 212 and the Y-axis direction walking device 213 into the heat transfer tube 5. Thereafter, by removing the operation rod, the inspection robot 21 is installed on the tube plate surface of the tube plate 4 in such a manner that the operation cable 219 extending from the substrate 211 is drawn out of the water chamber 7 from the manhole 7C. After the inspection robot 21 is installed on the tube plate 4 in this way, the drive motor 218c of the lifting mechanism 218 is operated to extend the belt 218b downward from the position shown in FIG. 2, and the lifting platform 218a is lowered to the manhole 7C. . Then, the probe support mechanism 22 is attached to the lifting platform 218a, the drive motor 218c is operated again to retract the belt 218b upward, the lifting platform 218a is returned to the original position shown in FIG. 2, and the preparation for inspection is completed. .

  By the way, the heat transfer tube 5 is inspected for damage on the inner surface of the heat transfer tube 5 by an eddy current flaw inspection. When damage to the inner surface of the heat transfer tube 5 is detected by the eddy current flaw inspection, an appearance inspection or an ultrasonic flaw inspection is performed as necessary to confirm this. Here, in the appearance inspection and the ultrasonic flaw detection inspection, the center axis of the inspection probe 30 coincides with the center axis of the heat transfer tube 5 so that an accurate inspection can be performed. The inspection robot 21 described above is supported on the tube plate surface by the clamp shafts 212a and 213a inserted into the heat transfer tube 5, and is based on the position of the heat transfer tube 5. And since the probe support mechanism 22 that guides and supports the inspection probe 30 is attached to the inspection robot 21 in consideration of the pitch of the heat transfer tubes 5, the inspection robot 21 is supported on the tube plate surface, It arrange | positions directly under the heat exchanger tube 5 to be examined. However, when the probe support mechanism 22 is attached to the inspection robot 21 with a slight positional deviation, the center axis of the inspection probe 30 guided by the probe support mechanism 22 is shifted from the center axis of the heat transfer tube 5. Therefore, it becomes difficult to perform an accurate inspection in appearance inspection and ultrasonic flaw detection inspection.

  Therefore, in the inspection apparatus 20 according to the present embodiment, even if the probe support mechanism 22 is attached to the inspection robot 21 with a minute positional deviation, the probe aligns the central axes of the inspection probe 30 and the heat transfer tube 5. A support mechanism 22 is provided.

  FIG. 4 is a side sectional view showing the probe support mechanism of the heat transfer tube inspection apparatus according to the present embodiment, FIG. 5 is an enlarged view of the probe support mechanism shown in FIG. 4, and FIG. It is a sectional side view which shows operation | movement of the probe support mechanism of the inspection apparatus of the heat exchanger tube which concerns on this form, and FIG. 7 is an enlarged view of the probe support mechanism shown in FIG. 4 to 7, the probe support mechanism 22 is attached to the inspection robot 21 as the fixing means as described above, and the inspection robot 21 is fixed to the tube plate surface of the tube plate 4. Indicates the state.

  As shown in FIGS. 4 and 5, the probe support mechanism 22 has a guide member 222 and a positioning mechanism for an inspection robot 21 as a fixing means, specifically, a mounting base 221 attached to a lifting platform 218 a of the lifting mechanism 218. 223 and moving means 224 are provided.

  The guide member 222 is formed in a long cylindrical shape, and guides the above-described inspection probe 30 through the inside thereof. The guide member 222 is attached so that the inspection robot 21 is fixed to the tube plate surface of the tube plate 4 so that the opening at one end faces upward (toward the tube plate 4) and the opening at the other end faces downward. It is attached to the base 221. The guide member 222 has an annular connecting portion 222a fixed to the outer periphery of one end thereof in a form having liquid tightness through an O-ring 222b. The connecting portion 222a is provided with an endless sealing material 222c that protrudes annularly over the entire circumference of the connecting portion 222a on the surface facing the tube sheet 4 side. The guide member 222 has a central axis C1 that is the central axis C2 of the heat transfer tube 5 in a state where the mounting base 221 is attached to the inspection robot 21 and the inspection robot 21 is fixed to the tube plate surface of the tube plate 4. It is provided to match.

  Further, as shown in FIG. 6, the guide member 222 has a length corresponding to the axial length of the inspection probe 30 so as to support the center axis C4 of the inspection probe 30 so as to coincide with the center axis C1 in the cylinder. Is formed. As shown in FIG. 6, the inspection probe 30 is disposed at the tip of the cable 30a and is formed long in the axial direction as a centering function. Therefore, the guide member 222 has a minute gap that can move in the axial direction with respect to the outer diameter of the inspection probe 30 so as to support the center axis C4 of the inspection probe 30 so as to coincide with the center axis C1 within the cylinder. The inner diameter of the inspection probe 30 is within the cylinder.

The positioning mechanism 223 has a proximal end attached to the attachment base 221 so that the distal end faces upward (toward the tube plate 4 side) in a state where the inspection robot 21 is fixed to the tube plate surface of the tube plate 4. Yes.
The positioning mechanism 223 includes a base portion 2231 on the proximal end side, a distal end portion 2232 on the distal end side, and a moving portion 2233 disposed between the base portion 2231 and the distal end portion 2232.

  The base portion 2231 has a cylindrical shape extending in the vertical direction in a state where the inspection robot 21 is fixed to the tube plate surface of the tube plate 4, and a cylindrical slide chamber 2231a is formed therein. ing. The base portion 2231 is isolated from the sliding chamber 2231a, and an air introduction path 2231b is formed from the lower end to the upper end. In addition, the base portion 2231 is formed with an air vent path 2231c communicating from the sliding chamber 2231a to the outside.

  The moving unit 2233 is formed in a state in which the inspection robot 21 is fixed to the tube plate surface of the tube plate 4 and has a cylindrical shape extending in the vertical direction, the lower end is opened, and the upper end is closed. Thus, a cylindrical expansion / contraction chamber 2233a is provided therein. This moving part 2233 is provided so as to be movable in the vertical direction with respect to the base part 2231 in a state where the expansion / contraction chamber 2233a has the base part 2231 and is airtight via the O-ring 2233b. . The expansion / contraction chamber 2233a communicates with the air introduction path 2231b of the base portion 2231. The moving portion 2233 is provided with a rod-like sliding portion 2233c that extends downward from the closed upper end in the expansion / contraction chamber 2233a and penetrates the sliding chamber 2231a of the base portion 2231. The sliding portion 2233c is provided with airtightness through the O-rings 2233d and 2233e with respect to the portion of the base portion 2231 penetrating the sliding chamber 2231a and the inner peripheral surface of the sliding chamber 2231a. The sliding portion 2231a of the base portion 2231 is configured to be slidable in the vertical direction. The upper end of the sliding portion 2233c is airtight through an O-ring 2233f, and is provided through the expansion / contraction chamber 2233a. The upper end of the sliding portion 2233c penetrating the expansion / contraction chamber 2233a is provided with an attachment pin 2233g extending upward. In the present embodiment, the moving part 2233 is connected to the guide member 222 by a connecting part 2233h.

  The distal end portion 2232 has a cylindrical shape extending in the vertical direction in a state where the inspection robot 21 is fixed to the tube plate surface of the tube plate 4, and the lower end is opened and the upper end is closed. Thus, a cylindrical storage chamber 2232a is provided therein. The distal end portion 2232 is provided so as to be movable in the vertical direction with respect to the moving portion 2233 in a state where the storage chamber 2232a has the moving portion 2233 installed therein. This movement is guided to the mounting pin 2233g because the mounting pin 2233g at the upper end of the sliding portion 2233c of the moving unit 2233 penetrates the housing chamber 2232a upward. The distal end portion 2232 is elastically biased so as to always move upward by a compression coil spring 2232b as an elastic member mounted around the moving portion 2233. Further, the top end portion 2232 is formed with a fitting portion 2232c as a positioning means having a tapered surface with a conical shape tapered toward the upper side and a bottom portion slightly larger than the opening diameter of the heat transfer tube 5 at the upper end thereof. ing.

  The moving means 224 moves the moving part 2233 and the front end part 2232 of the positioning mechanism 223 along the vertical direction, and is configured as an air cylinder. The moving means 224 is fixed to the base end side of the base portion 2231, and the compressed air supply side communicates with the air introduction path 2231 b of the base portion 2231. That is, the compressed air supplied by the moving means 224 is supplied to the expansion / contraction chamber 2233a of the moving unit 2233 via the air introduction path 2231b. When the compressed air from the moving means 224 is supplied to the expansion / contraction chamber 2233a, as shown in FIGS. 6 and 7, the air in the sliding chamber 2231a is discharged by obtaining the air vent 2231c, and the moving portion 2233 is compressed. The tip portion 2232 moves upward due to the air moving upward. On the other hand, when the supply of compressed air by the moving means 224 stops, as shown in FIG. 4 and FIG. 5, an air vent path 2231c is obtained and air is introduced into the sliding chamber 2231a, and the sliding portion 2233c moves downward. Since it moves down, the moving part 2233 moves downward, and accordingly, the tip part 2232 moves downward. Further, since the guide member 222 is connected to the moving part 2233 via the connecting part 2233h, the guide member 222 moves up and down as the moving part 2233 moves up and down.

  Note that the guide member 222 may not be coupled to the moving unit 2233 via the coupling unit 2233h. In this case, the moving means 224 is configured as a positioning means moving means that only moves the fitting portion 2232c as the positioning means. When the guide member 222 is moved in the axial direction in the configuration in which the guide member 222 is not connected to the moving unit 2233, the air similar to the moving unit 224 is shown separately from the positioning unit moving unit, although not shown in the drawing. A guide member moving means comprising a cylinder may be provided.

  In the positioning mechanism 223, the conical center line C3 of the fitting portion 2232c is parallel to the moving direction of the moving portion 2233 by the sliding portion 2233c and coincides with the central axis of the mounting pin 2233g extending. It is configured. The central axis C3 is parallel to the central axis C1 of the guide member 222, and is arranged with respect to the central axis C1 of the guide member 222 at an interval based on the arrangement interval of the heat transfer tubes 5. For this reason, the positioning mechanism 223 has the center axis C3 as the center of the heat transfer tube 5 in a state where the mounting base 221 is attached to the inspection robot 21 and the inspection robot 21 is fixed to the tube plate surface of the tube plate 4. It is provided so as to coincide with the axis C2.

  As shown in FIGS. 4 to 7, in the probe support mechanism 22, the guide member 222 is connected to the moving portion 2233 of the positioning mechanism 223, and the moving means 224 is fixed to the base portion 2231 of the positioning mechanism 223. Therefore, the guide member 222, the positioning mechanism 223, and the moving means 224 are integrated. The guide member 222, the positioning mechanism 223, and the moving means 224 are provided so as to be slidable in the direction perpendicular to the central axes C1 and C3 by the slide mechanism with respect to the mounting base 221. Specifically, as shown in FIGS. 5 and 7, in the slide mechanism, the guide member 222 is inserted into the insertion hole 221 a provided in the attachment base 221 with a gap. The spring member 221b is interposed in the gap between the guide member 222 and the insertion hole 221a. Further, the base 2231 of the positioning mechanism 223 is controlled to move in the direction perpendicular to the central axes C1 and C3 while being restricted from moving in the direction along the central axes C1 and C3 with respect to the mounting base 221. And is attached by a support frame 221c. Further, the moving means 224 is inserted through a through hole 221d provided in the attachment base 221 with a gap. A spring member 221e is interposed in the gap between the moving means 224 and the insertion hole 221d. Thus, the guide member 222, the positioning mechanism 223, and the moving means 224 are provided to be slidable in the direction perpendicular to the central axes C1 and C3 by the slide mechanism with respect to the mounting base 221.

  The operation of the probe support mechanism 22 described above and the inspection method using the probe support mechanism 22 described above will be described below.

  First, the inspection robot 21 to which the probe support mechanism 22 is attached is fixed to the tube plate surface of the tube plate 4, and the guide member 222 is disposed immediately below the heat transfer tube 5 to be inspected. Along with this, the positioning mechanism 223 is disposed directly under the heat transfer tube 5 different from the inspection target (see FIG. 4).

  Next, as shown in FIG. 6 from the state of FIG. 4, the moving unit 224 moves the moving unit 2233 and the front end 2232 of the positioning mechanism 223 upward. Thereby, the taper surface of the fitting part 2232c of the front-end | tip part 2232 contact | abuts to the opening part of the heat exchanger tube 5, being provided with the elastic urging | biasing force by the compression coil spring 2232b. Since the tapered surface of the fitting portion 2232c is conical, the fitting portion 2232c is fitted to the central axis C2 of the heat transfer tube 5 so that the true circle portion thereof matches the opening of the heat transfer tube 5. The fitting portion 2232c is fitted into the opening of the heat transfer tube 5 so that the central axis C3 of the portion 2232c coincides. For this reason, the central axis C1 of the guide member 222 also coincides with the central axis C2 of the heat transfer tube 5 to be inspected. As a result, even if the probe support mechanism 22 is attached to the inspection robot 21 with a slight positional deviation, the center between the inspection probe 30 inserted and supported by the guide member 222 and the heat transfer tube 5 to be inspected is obtained. The axes C2 and C4 can be aligned.

  In particular, when the opening portion of the heat transfer tube 5 to the tube plate 4 is inspected, the center axes C2 and C4 of the inspection probe 30 inserted and supported by the guide member 222 and the heat transfer tube 5 to be inspected coincide with each other. Otherwise, it is difficult to obtain accurate inspection data. Therefore, according to the inspection apparatus of the present embodiment and the inspection method using the inspection apparatus, the central axes C2 and C4 of the inspection probe 30 inserted and supported by the guide member 222 and the heat transfer tube 5 to be inspected are obtained. Since they can be combined, accurate inspection data can be acquired when the opening portion of the heat transfer tube 5 to the tube plate 4 is inspected.

  As shown in FIG. 6, the guide member 222 connected to the moving unit 2233 of the positioning mechanism 223 also moves upward together with the moving unit 2233. For this reason, the sealing material 222c at the tip of the guide member 222 is in contact with the tube plate surface of the tube plate 4 around the opening of the heat transfer tube 5 to be inspected, and the guide member 222 with respect to the heat transfer tube 5 to be inspected. Will be connected in a sealed state. As a result, for example, in an inspection in which water is filled in the heat transfer tube 5 as a contact medium as in the ultrasonic flaw detection inspection, there is no leakage of the water, so that accurate inspection data can be acquired.

  In particular, when the opening portion of the heat transfer tube 5 to the tube plate 4 is inspected, if the guide member 222 is not connected in a sealed state to the heat transfer tube 5 to be inspected, the water charged in the heat transfer tube 5 is filled. Leakage is significant. Therefore, according to the inspection device of the present embodiment and the inspection method using the inspection device, the guide member 222 can be connected in a sealed state to the heat transfer tube 5 to be inspected. It is possible to acquire accurate inspection data when inspecting the opening to the tube sheet 4.

  As described above, the heat transfer tube inspection apparatus according to the present embodiment is provided in the inspection robot (fixing means) 21 fixed to the tube plate surface of the tube plate 4 where the heat transfer tube 5 opens, and is inserted into the heat transfer tube 5. A cylindrical guide member 222 for inserting and guiding the inspection probe 30 along its own central axis C1 and the inspection robot 21 and having its own central axis C3 parallel to the central axis C1 of the guide member 222 In addition, the central axes C1 and C3 are arranged at intervals based on the arrangement interval of the heat transfer tubes 5 and are fitted to the heat transfer tubes 5 so as to be fitted (positioning members) 2232c. And a moving means (positioning member moving means) 224 for moving the fitting portion 2232c along the central axis C3 of the fitting portion 2232c.

  According to this heat transfer tube inspection device, by fitting the fitting portion 2232c to the heat transfer tube 5, the central axis C3 of the fitting portion 2232c coincides with the central axis C2 of the fitted heat transfer tube 5. . For this reason, the central axis C1 of the guide member 222 coincides with the central axis C2 of the heat transfer tube 5 to be inspected. As a result, the central axes C2 and C4 of the inspection probe 30 inserted and supported by the guide member 222 and the heat transfer tube 5 to be inspected can be aligned.

  In addition, in embodiment mentioned above, although the fitting part 2232c was demonstrated as a positioning member, the positioning member corresponds to the central axis C2 of the heat exchanger tube 5 with the said central axis C3 along its own central axis C3. Anything can be used. For example, although not explicitly shown in the drawing, it is inserted and fitted into the heat transfer tube 5 by moving along the center axis C3, and the center axis C3 coincides with the center axis C2 of the heat transfer tube 5 by this insertion, A clamp mechanism that is inserted into the heat transfer tube 5 by moving along the axis C <b> 3 and expanded within the heat transfer tube 5 may be used.

  In addition, the heat transfer tube inspection apparatus of the present embodiment is configured as a fitting portion 2232c having a conical tapered surface as a positioning member, and the tapered surface is an opening portion of the heat transfer tube 5 as the moving unit 224 moves. Is abutted and fitted.

  According to this heat transfer tube inspection device, the conical taper surface of the fitting portion 2232c is aligned with the opening of the heat transfer tube 5 so that its true circle portion coincides, that is, the central axis of the heat transfer tube 5 Fitting is performed so that the central axis C3 of the fitting portion 2232c matches with C2. Since the fitting portion 2232c is fitted into the opening of the heat transfer tube 5, the movement stroke is relatively short, so that the apparatus can be downsized.

  Further, the heat transfer tube inspection device of the present embodiment includes a compression coil spring (elastic member) 2232b that elastically biases the fitting portion 2232c toward the heat transfer tube 5.

  According to this heat transfer tube inspection device, the fitting portion 2232c abuts the opening of the heat transfer tube 5 while being elastically biased by the compression coil spring 2232b. The action of matching circles is assisted. As a result, the effect that the center axis C3 of the fitting portion 2232c matches the center axis C2 of the heat transfer tube 5 can be obtained remarkably.

  In addition, the heat transfer tube inspection apparatus according to the present embodiment includes a slide mechanism that supports the guide member 222 and the fitting portion (positioning member) 2232c so as to be slidable in directions orthogonal to the central axes C1 and C3. .

  This heat transfer tube inspection device can absorb the displacement of the inspection robot 21 by the sliding movement of the guide member 222 and the fitting portion (positioning member) 2232c.

  In addition, the heat transfer tube inspection apparatus according to the present embodiment includes a moving unit (guide member moving unit) 224 that moves the guide member 222 along the central axis C <b> 1 of the guide member 222, and the movement of the guide member 222. A seal member 222c provided over the entire periphery of the tip of the guide member 222 in a manner of coming into contact with the periphery of the opening of the heat transfer tube 5.

  According to this heat transfer tube inspection apparatus, the seal material 222c at the tip of the guide member 222 is in contact with the tube plate surface of the tube plate 4 around the opening of the heat transfer tube 5 to be inspected, and the heat transfer tube to be inspected. 5, the guide member 222 is connected in a sealed state. As a result, for example, in an inspection in which water is filled in the heat transfer tube 5 as a contact medium as in the ultrasonic flaw detection inspection, there is no leakage of the water, so that accurate inspection data can be acquired.

  Further, in the heat transfer tube inspection apparatus according to the present embodiment, the positioning member moving means that moves the fitting portion (positioning member) 2232c and the guide member moving means that moves the guide member 222 are common moving means 224. Consists of.

  According to this heat transfer tube inspection apparatus, by configuring each moving means in common, the apparatus can be miniaturized and the manufacturing cost can be reduced.

  Further, in the heat transfer tube inspection apparatus of the present embodiment, the guide member 222 is formed to a length that supports the inspection probe 30 therein.

  According to this heat transfer tube inspection device, the inspection probe 30 needs to be supported at the position of the opening of the heat transfer tube 5 when the opening of the heat transfer tube 5 to the tube plate 4 is inspected. Therefore, if the guide member 222 is formed to a length that supports the inspection probe 30 therein, the inspection probe 30 can be supported at the position of the opening of the heat transfer tube 5, so that the heat transfer tube 5 is attached to the tube plate 4. It is possible to acquire accurate inspection data when performing inspection of the opening.

  Further, the heat transfer tube inspection method of the present embodiment is provided in the inspection robot (fixing means) 21 fixed to the tube plate surface of the tube plate 4 where the heat transfer tube 5 opens, and is inserted into the heat transfer tube 5. A cylindrical guide member 222 that inserts and guides the probe 30 along its own central axis C1 and the inspection robot 21 have its own central axis C3 parallel to the central axis C1 of the guide member 222, and The center axes C1 and C3 are arranged at intervals based on the arrangement interval of the heat transfer tubes 5, and are fitted with fitting portions (positioning members) 2232c provided so as to be fitted to the heat transfer tubes 5. A heat transfer tube inspection method using a heat transfer tube inspection device comprising: a moving means (positioning member moving means) 224 for moving the fitting portion 2232c along the central axis C3 of the joint portion 2232c, the guide member 222 is the inspection target A step of fixing the inspection robot 21 to the surface of the tube plate so as to be positioned directly below the heat transfer tube 5, and then moving the fitting portion 2232 c by the moving means 224 to separate the heat transfer tube 5 to be inspected. The step of fitting to the heat pipe 5 so that the central axis C1 of the guide member 222 coincides with the central axis C2 of the heat transfer tube 5 to be inspected, and then the inspection probe 30 to the heat transfer tube 5 to be inspected through the guide member 222. And inspecting the heat transfer tube 5.

  According to this heat transfer tube inspection method, by fitting the fitting portion 2232c to the heat transfer tube 5, the central axis C3 of the fitting portion 2232c coincides with the central axis C2 of the fitted heat transfer tube 5. . For this reason, the central axis C1 of the guide member 222 coincides with the central axis C2 of the heat transfer tube 5 to be inspected. As a result, it is possible to match the central axes C2 and C4 of the inspection probe 30 inserted and supported by the guide member 222 and the heat transfer tube 5 to be inspected, and to acquire accurate inspection data.

  Further, in the heat transfer tube inspection method of the present embodiment, the heat transfer tube inspection device includes a moving means (guide member moving means) 224 for moving the guide member 222 along the central axis C1 of the guide member 222, and a guide. A seal member 222c provided over the entire periphery of the tip of the guide member 222 in such a manner as to abut around the opening of the heat transfer tube 5 as the member 222 moves, and the central axis C1 of the guide member 222 Is aligned with the central axis C2 of the heat transfer tube 5 to be inspected, the guide member 222 is moved by the moving means 224 to bring the sealing material 222c into contact with the periphery of the opening of the heat transfer tube 5 to be inspected. A step of connecting the guide member 222 to the heat pipe 5 in a sealed state is included.

  According to this heat transfer tube inspection method, the sealing material 222c at the tip of the guide member 222 is in contact with the tube plate surface of the tube plate 4 around the opening of the heat transfer tube 5 to be inspected, and the heat transfer tube to be inspected. 5, the guide member 222 is connected in a sealed state. As a result, for example, in an inspection in which water is filled in the heat transfer tube 5 as a contact medium as in the ultrasonic flaw detection inspection, there is no leakage of the water, so that accurate inspection data can be acquired.

DESCRIPTION OF SYMBOLS 1 Steam generator 4 Tube plate 5 Heat transfer tube 7 Water chamber 7C Manhole 20 Inspection device 21 Inspection robot 22 Probe support mechanism 221 Mounting base 221a Insertion hole 221b Spring member 221c Support frame 221d Insertion hole 221e Spring member 222 Guide member 222a Connection part 222a O-ring 222c Sealing material 223 Positioning mechanism 2231 Base portion 2231a Sliding chamber 2231b Air introduction passage 2231c Air vent passage 2232 Tip portion 2232a Storage chamber 2232b Compression coil spring 2232c Fitting portion 2233 Moving portion 2233a Expansion / contraction chamber 2233b, 2233d, 2233d 2233f O-ring 2233c Sliding part 2233g Mounting pin 2233h Connecting part 224 Moving means 23 Pusher device 30 Inspection probe 30a Cable C1, C2, C3, C4 Axis

Claims (6)

A cylindrical guide member that is provided in a fixing means that is fixed to the tube plate surface of the tube plate in which the heat transfer tube is opened, and that guides the inspection probe inserted into the heat transfer tube along its own central axis,
Provided in the fixing means, having its own central axis parallel to the central axis of the guide member, the central axes being arranged at intervals based on the arrangement interval of the heat transfer tubes, and A positioning member provided so as to be fitted to the heat transfer tube;
Positioning member moving means for moving the positioning member along the central axis of the positioning member;
Guide member moving means for moving the guide member along the central axis of the guide member;
A seal member provided over the entire periphery of the tip of the guide member in a manner of abutting around the opening of the heat transfer tube with the movement of the guide member;
And the sealing member of the guide member abuts around the opening of the heat transfer tube to be inspected in a state where the positioning member is fitted to a heat transfer tube different from the heat transfer tube to be inspected. As described above, the positioning member moving means and the guide member moving means are configured in common, and water is filled in the heat transfer tube to be inspected as a contact medium for ultrasonic flaw detection inspection. apparatus.   The positioning member is configured as a fitting portion having a conical tapered surface, and the tapered surface is brought into contact with and fitted to the opening of the heat transfer tube as the positioning member moves. The heat transfer tube inspection device according to claim 1.   The heat transfer tube inspection apparatus according to claim 2, further comprising an elastic member that elastically biases the fitting portion toward the heat transfer tube.   The heat transfer tube according to any one of claims 1 to 3, further comprising a slide mechanism that supports the guide member and the positioning member so as to be slidable together in a direction orthogonal to the central axis. Inspection device. The said guide member is formed in the length which supports the said test | inspection probe inside, The inspection apparatus of the heat exchanger tube as described in any one of Claims 1-4 characterized by the above-mentioned. A cylindrical guide member that is provided in a fixing means that is fixed to the tube plate surface of the tube plate in which the heat transfer tube opens, and that guides the inspection probe inserted into the heat transfer tube along its own central axis, and the fixing And the center axis of the guide member is parallel to the center axis of the guide member, the center axes are arranged at intervals based on the arrangement interval of the heat transfer tubes, and the heat transfer tubes A positioning member that can be fitted to the positioning member, a positioning member moving unit that moves the positioning member along the central axis of the positioning member, and a positioning member that moves along the central axis of the guide member. A guide member moving means for moving the guide member, and a seal member provided over the entire circumference of the tip of the guide member in a manner of coming into contact with the periphery of the opening of the heat transfer tube as the guide member moves. wherein the positioning member moves Wherein the guide member moving means are commonly constituted a means, method of inspecting a heat exchanger tube using a test device of the heat transfer tube,
Fixing the fixing means to the tube plate surface so that the guide member is located immediately below the heat transfer tube to be inspected;
Next, the positioning member is moved by the positioning member moving means and fitted to a heat transfer tube different from the heat transfer tube to be inspected, and the central axis of the guide member is set to the heat transfer tube to be inspected A step of matching the central axis of
Next, the step of inserting the inspection probe into the heat transfer tube to be inspected through the guide member and inspecting the heat transfer tube;
Including
In the step of causing the center axis of the guide member to coincide with the center axis of the heat transfer tube to be inspected, the positioning member is fitted to another heat transfer tube, and the sealing material is attached to the heat transfer tube to be inspected. Contacting the periphery of the opening, and connecting the guide member in a sealed state to the heat transfer tube,
A heat transfer tube inspection method, wherein water is filled into the heat transfer tube as a contact medium for ultrasonic flaw detection inspection.

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