WO2012066945A1

WO2012066945A1 - Pipe expansion tool

Info

Publication number: WO2012066945A1
Application number: PCT/JP2011/075449
Authority: WO
Inventors: 崇香川; 貴志金伏; 下楠　善昭
Original assignee: 三菱重工業株式会社
Priority date: 2010-11-15
Filing date: 2011-11-04
Publication date: 2012-05-24
Also published as: JP2012106249A

Abstract

Two liquid sealing sections are arranged on the outer peripheral surface of a mandrel section (13) at an interval in the axial direction, the mandrel section (13) pressing and expanding a pipe material (P) from the inside by hydraulic pressure and affixing the pipe material (P) to the pipe hole. The liquid sealing sections each comprises, in order from the liquid discharge opening (13c) side: an annular elastic member (15, 16); an annular guide member (17, 18) having a tapered sloped surface facing the annular elastic member (15, 16); an annular deformable member (19, 20) having an outer diameter expanded by being compressed by pressing force from the annular guide member (17, 18); and an annular engagement member (21, 22). The annular elastic member (15, 16), the annular guide member (17, 18), and the annular deformable member (19, 20) can move in the axial direction on the outer peripheral surface, and the annular engagement member (21, 22) cannot move. The annular elastic members (15, 16) are formed so that the outer diameter thereof is smaller than the inner diameter of the pipe material (P) and that the annular elastic members (15, 16) can move in the axial direction on the sloped surfaces. Preferably, a communication groove (21a, 22a) for connecting spaces formed on the annular end surface side of annular positioning member (23, 24) is provided in the annular engagement member (21, 22) and in the annular positioning member (23, 24) which is located on the outer peripheral surface of the annular engagement member (21, 22).

Description

Tube expansion tool

The present invention relates to a tube expansion tool for fixing a tube material inserted into a tube hole of a tube holding member to the tube hole by expanding the tube material from the inside.

Conventionally, various pipe expansion methods using this type of pipe expansion tool are known. For example, Patent Documents 1 to 4 listed below disclose a tube expansion tool and a tube expansion method for a heat transfer tube of a steam generator used as a heat exchanger in a nuclear power plant. The pipe expanding method disclosed in Patent Documents 1 and 2 is a so-called hydraulic pipe expanding method in which the pipe is pushed from the inside by the liquid pressure of the liquid filled in the pipe. Here, Patent Document 1 discloses that two liquid seal portions provided at intervals in the axial direction on the outer peripheral surface of a mandrel inserted into the pipe material, and the liquid disposed between the liquid seal portions. A tube expansion tool having a discharge port is described. The liquid sealing portion performs a liquid sealing function by an O-ring, a urethane rubber ring, and a backup ring arranged in order from the liquid discharge port side. In this pipe expanding tool, the O-ring enhances the liquid tightness between the inner wall surface of the pipe material regardless of whether or not the hydraulic pressure is applied to the O-ring. Furthermore, in this tube expansion tool, when a pressing force is applied to the urethane rubber ring from the O-ring to which hydraulic pressure is applied, the urethane rubber ring whose movement in the axial direction is regulated by the backup ring is compressed while the outer diameter Therefore, the tube material is expanded from the inner wall surface side, and the liquid tightness is enhanced between the tube material and the inner wall surface. Patent Document 3 discloses a tube expansion tool including two liquid sealing portions and a liquid discharge port between them as in the case of Patent Document 1. One liquid sealing portion described in Patent Document 3 is not moved or deformed during tube expansion while being inserted in a state where liquid tightness is ensured in the pipe material. On the other hand, the other liquid sealing portion includes two soft elastic bodies and a hard elastic body in order from the liquid discharge port side, and expands in the outer diameter direction while moving in the axial direction during tube expansion. To go. In this tube expansion tool, liquid tightness is ensured by one soft elastic body before the hydraulic pressure is applied. Further, the pipe expanding method disclosed in Patent Document 4 is a so-called so-called pipe expanding roller that is radially arranged by inserting radially expanding pipe expanding rollers into the pipe and moving the pipe expanding rollers in the radial direction while pushing them open in the radial direction. This is called the roller expansion method. Further, in the pipe expansion method of Patent Document 5, after the end of the pipe material is expanded by a roller, most of the portion of the pipe material to be expanded (hereinafter referred to as “expanded portion”) is hydraulically expanded, and thereafter The part that was not expanded is expanded by a roller.

JP 2001-269732 A Japanese Utility Model Publication No. 63-101127 Japanese Patent No. 3416220 Japanese Utility Model Publication No. 63-006125 JP 2008-025918 A

By the way, in such a pipe expansion method, it is naturally important to accurately expand the target part of the pipe material to be expanded, but it is also important not to expand the part other than the target part. For example, in the liquid pressure expanding method, if the liquid leaks from the expansion target part, the liquid pressure may be applied to the part other than the expansion target part and the pipe may be expanded. That is, in this hydraulic expansion method, securing liquid-tightness is an important requirement for performing an appropriate expansion operation for the site to be expanded.

Therefore, an object of the present invention is to provide a tube expansion tool that improves the disadvantages of the conventional example and enables an appropriate tube expansion operation for the tube expansion target portion.

In order to achieve the above object, the present invention inserts the tube material into the tube hole inserted into the tube hole of the tube holding member, and expands the tube material from the inside by the pressure of the liquid supplied from the liquid discharge port. A mandrel portion to be fixed in the hole, and two liquid sealing portions disposed on the outer peripheral surface of the mandrel portion with an interval in the axial direction to suppress leakage of the liquid to the outside of the tube. In the tool, the liquid sealing part is an annular elastic member (O-ring), an annular guide member, and an annular deformation member that are movable in the axial direction on the outer peripheral surface of the mandrel part in order from the liquid discharge port side in the axial direction. (Urethane rubber ring) and an annular locking member that cannot move in the axial direction on the outer peripheral surface of the mandrel portion. The annular guide member has a tapered inclined surface facing the annular elastic member, and the annular elastic member has an outer diameter smaller than an inner diameter of the tube material and is on the inclined surface of the annular guide member. The annular deformable member is shaped so as to be compressed by the axial pressing force from the annular guide member so that the outer diameter can be expanded. .

Here, it is desirable to provide an annular positioning member having an outer diameter equivalent to the inner diameter of the tube material on the outer peripheral surface of each of the annular locking members.

Further, at least one of the annular locking member and the annular positioning member arranged at least on the distal end side of the mandrel portion is provided with a communication groove for communicating a space formed on each annular end face side of the annular positioning member. It is desirable to provide it.

In the pipe expanding tool according to the present invention, an annular elastic member having an outer diameter smaller than the inner diameter of the pipe material is moved on the tapered inclined surface by being guided to the annular guide member by hydraulic pressure. The liquid tightness of the tube expansion target part is secured by crimping to the wall surface. For this reason, this tube expansion tool is already crimped to the inner wall surface of the pipe material before the hydraulic pressure is applied, and moves in the axial direction by applying the hydraulic pressure to compress the annular deformation member (urethane rubber ring). As compared with the annular elastic member (O-ring) disclosed in Patent Document 1, it is possible to improve the durability of the annular elastic member and improve the liquid-tightness due to the annular elastic member. In other words, the conventional annular elastic member repeatedly wears the outer peripheral surface with the inner wall surface of the pipe material. On the other hand, since the annular elastic member according to the present invention can suppress such wear on the outer peripheral surface, durability is improved. The annular elastic member according to the present invention not only can suppress a decrease in liquid-tightness due to an improvement in durability, but also has a pressing force in the direction along the tapered inclined surface due to the hydraulic pressure (an axis line due to the hydraulic pressure). Pressure force to the outer wall of the tube and the inner wall surface of the pipe material, so that only the radially outward pressing force due to its own elasticity and the axial pressing force due to the hydraulic pressure can be applied. The liquid tightness is improved as compared with the conventional annular elastic member. Further, in this pipe expanding tool, the pipe material is expanded by an annular deforming member that is compressed by an axial pressure from the annular guide member and has an enlarged outer diameter. Since it is crimped to the inner wall surface, the liquid tightness can be improved. As described above, according to the tube expansion tool according to the present invention, the liquid tightness of the tube expansion target portion can be sufficiently ensured, so that an appropriate tube expansion operation for the tube expansion target portion can be performed. Moreover, in this pipe expansion tool, since the center axis | shaft of a pipe material and a pipe expansion tool can be made to correspond substantially by providing an annular positioning member, a hydraulic pressure can be applied equally with respect to the inner wall surface of a pipe material, and equal Tube expansion becomes possible. Further, in this pipe expanding tool, the annular elastic member leaks out from the pipe expansion target part before exhibiting liquid tightness by providing a communication groove for communicating the space formed on each annular end face side of the annular positioning member. Since the liquid can escape from the communication groove, unnecessary pipe expansion operation due to the liquid pressure of the leaked liquid can be prevented.

FIG. 1 is a view showing an example of a hydraulic expansion system in which a tube expansion tool according to the present invention is used. FIG. 2 is a view showing a tube expanding tool according to the present invention. FIG. 3 is a cross-sectional view taken along the line XX of FIG. 2 and shows the periphery of the through hole for liquid flow and the liquid discharge port. FIG. 4 is a partial cross-sectional view taken along the line XX in FIG. 2 and is a view showing the distal end side of the tube expanding tool. FIG. 5 is a view showing a state when the tube expansion work by the tube expansion tool according to the present invention is finished. FIG. 6 is a view showing another example of the tube expansion tool according to the present invention. 7 is a cross-sectional view taken along line YY in FIG. FIG. 8 is a diagram illustrating an example of a nuclear power plant including a steam generator that can be used for pipe expansion work by the pipe expansion tool according to the present invention. FIG. 9 is a diagram illustrating an example of a steam generator including a heat transfer tube to which tube expansion work can be applied using a tube expansion tool according to the present invention.

Hereinafter, embodiments of the tube expansion tool according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.

[Example]
An embodiment of a pipe expanding tool according to the present invention will be described with reference to FIGS.

The pipe expanding tool of the present embodiment is used for a hydraulic pipe expanding method in which a high-pressure liquid is supplied into a pipe material and pushed from the inside, and the liquid is supplied to the inside thereof. .

1 indicates a tube expanding tool of the present embodiment, and 50 in FIG. 1 indicates a hydraulic tube expanding system. The hydraulic expansion system 50 illustrated here includes a tube expansion tool 1 that is inserted into the tube material P inserted into the tube hole of the tube holding member S, and a positioning device that inserts and removes the tube expansion tool 1 with respect to the tube material P. 51, a liquid supply device 52 that pumps the liquid to the tube expansion tool 1, and a control device 53 that controls operations of the positioning device 51 and the liquid supply device 52. The pipe material P before the pipe expansion has an outer diameter smaller than that of the pipe hole.

In the hydraulic pressure expansion system 50, the control device 53 controls the positioning device 51 and inserts the tube expansion tool 1 into the tube material P. Thereafter, the control device 53 controls the liquid supply device 52 to supply the liquid whose pressure has been increased to a predetermined high pressure to the tube expansion tool 1. Thereby, since the liquid flows out into the inside of the pipe material P from the tube expansion tool 1, the pipe material P is pushed and expanded from the inside by the pressure of the liquid filled in the inside. The control device 53 controls the liquid supply device 52 to lower the fluid pressure after the completion of the tube material P expanding step, and controls the positioning device 51 to remove the tube expanding tool 1 from the inside of the tube material P. In addition, it may replace with the positioning apparatus 51 and an operator may perform manually about insertion / extraction of the pipe expansion tool 1. FIG.

As shown in FIG. 2, the tube expansion tool 1 includes a columnar base portion 11, a liquid introduction portion 12 extending from one end of the base portion 11 in the axial direction, and an axis line from the other end of the base portion 11. And a mandrel portion 13 extending in the direction.

The liquid introduction part 12 is formed into a concentric circular column shape whose outer diameter is smaller than the outer diameter of the base part 11, for example. The liquid introduction part 12 is a part into which the liquid from the liquid supply device 52 is introduced in the tube expansion tool 1, but is also a coupling part inserted into a liquid supply part (not shown) of the liquid supply apparatus 52. Therefore, an annular elastic member made of an elastic material (hereinafter referred to as “annular elastic member”) is formed on the outer peripheral surface of the liquid introducing portion 12 in order to prevent liquid leakage from the liquid supply portion 12. 14 is arranged. As the annular elastic member 14, for example, an O-ring is used. Here, the annular elastic member 14 is disposed in an annular groove formed on the outer peripheral surface thereof.

As shown in FIG. 3, the liquid introduction part 12 is formed with a through hole 12a on its central axis. The liquid (water) that has been pumped to the liquid supply unit in the liquid supply device 52 flows into the end surface of the liquid introduction unit 12 from the opening formed by the through hole 12a.

Here, the base 11 has a through hole 11 a on the central axis similar to the liquid introduction part 12. Since the through hole 11 a and the through hole 12 a of the liquid introduction part 12 are in communication, the liquid fed into the through hole 12 a flows into the through hole 11 a of the base part 11. In this example, since the base portion 11 and the liquid introduction portion 12 are integrally formed, the through

holes

11a and 12a are formed as one through hole.

Furthermore, the mandrel portion 13 is also formed with a through hole 13a along the axial direction with the same central axis as the center. The through hole 13 a communicates with the through hole 12 a of the liquid introduction part 12. For this reason, the liquid supplied from the liquid supply device 52 is sent to the through hole 13 a of the mandrel part 13.

The mandrel part 13 is formed into a concentric cylindrical shape whose outer diameter is smaller than the outer diameter of the base part 11, for example. Specifically, as shown in FIG. 2, the mandrel portion 13 includes a first cylindrical portion 13A and second and third portions extending from the respective end surfaces of the first cylindrical portion 13A in the axial direction thereof. Are roughly divided into

cylindrical portions

13B and 13C. In this example, the first to third

cylindrical portions

13A, 13B, and 13C are integrally formed. Further, the outer diameters of the second and third

cylindrical portions

13B and 13C are smaller than the outer diameter of the first cylindrical portion 13A as shown in FIGS. A liquid discharge port 13c, which will be described later, is formed in the first cylindrical portion 13A. The second cylindrical portion 13B connects the first cylindrical portion 13A and the base 11. Here, as shown in FIG. 3, the second cylindrical portion 13 </ b> B is screwed to the base portion 11 so that they can be attached and detached. The third cylindrical portion 13 </ b> C forms the tip side of the mandrel portion 13.

In the tube expansion tool 1, the liquid is discharged from the mandrel portion 13, and the liquid is filled inside the tube expansion target portion of the pipe material P. For this reason, the mandrel portion 13 is formed longer than at least the portion to be expanded. Here, when the mandrel portion 13 is inserted into the tube material P, the annular end surface of the base 11 formed on the mandrel portion 13 side is brought into contact with the end surface of the tube material P. Here, when expanding the pipe P, the end of the pipe P may be expanded by, for example, a well-known roller expansion method before the hydraulic expansion process. For this reason, in this case, the pipe expansion target part (hereinafter referred to as “hydraulic pipe expansion target part”) is a roller pipe expansion part executed at least in the previous process from the whole pipe expansion target part of the pipe P. Refers to the removed part. The pipe material P given as an example in FIG. 2 shows the shape after the roller expansion and before the hydraulic expansion.

The first cylindrical portion 13A of the mandrel portion 13 is formed with a through hole 13b that communicates the outer peripheral surface with the through hole 13a. Thereby, the opening part which the through-hole 13b comprises in the outer peripheral surface becomes the liquid discharge port 13c which sends a liquid into the inside of the pipe material P. FIG. The through hole 13b is formed so that the liquid discharge port 13c is located at a position where the liquid discharge port 13c can face the inner wall of the pipe P in the target site of the hydraulic pressure expansion. Here, the through hole 13 b is orthogonal to the axial direction of the mandrel portion 13. Accordingly, the liquid supplied from the liquid supply device 52 sequentially flows through the through

holes

12a, 11a, 13a, and 13b, and is supplied from the liquid discharge port 13c to the inside of the hydraulic pressure expansion target portion in the pipe material P.

In order to expand the tube material P with the tube expansion tool 1, a high fluid pressure is applied from the inside to the target site of the fluid pressure expansion, so that it is necessary to prevent the supplied liquid from leaking outside. For this reason, two liquid sealing portions are provided on the outer peripheral surface of the mandrel portion 13 so as to have a predetermined interval in the axial direction and suppress leakage of the liquid to the outside. The liquid discharge port 13c is disposed between the respective liquid seal portions. Here, it is only necessary to prevent the supplied liquid from leaking out from the target site of the liquid pressure expansion tube, and thus corresponds to both ends of the target site of the hydraulic pressure tube expansion on the outer peripheral surface when the mandrel portion 13 is inserted into the pipe P. A liquid seal is provided for each part.

Each liquid seal portion includes first and second annular

elastic members

15 and 16. For the first and second annular

elastic members

15, 16, for example, O-rings are used.

Here, the first and second annular

elastic members

15 and 16 are formed as those having an outer diameter smaller than the inner diameter of the tube material P before the tube expansion in order to facilitate the insertion of the mandrel portion 13 into the tube material P. For this reason, the first and second annular

elastic members

15 and 16 cannot secure liquid-tightness as they are. Therefore, the first and second annular

elastic members

15 and 16 first determine the inner diameters so that they can move in the axial direction on the outer peripheral surfaces of the second and third

cylindrical portions

13B and 13C, respectively. Thereby, when hydraulic pressure is supplied, the first and second annular

elastic members

15 and 16 can be pushed and moved in the axial direction by the hydraulic pressure. Furthermore, concentric tapered (conical) slopes on the outer peripheral surfaces of the second cylindrical portion 13B and the third cylindrical portion 13C are opposed to the first annular elastic member 15 and the second annular elastic member 16, respectively. Each surface is provided. The tapered inclined surface has a divergent shape in which the outer diameter expands along the pushing direction of the first and second annular

elastic members

15 and 16 by hydraulic pressure. The first and second annular

elastic members

15 and 16 determine their shapes and materials so that they can move along the axial direction on the inclined surfaces. The tapered inclined surface is inclined so that the first and second annular

elastic members

15 and 16 can move based on the pressing force applied from the first and second annular

elastic members

15 and 16. Set to corner. Furthermore, the tapered inclined surface is smaller than the inner diameter of the tube material P before the pipe expansion with respect to the maximum outer diameter portion, and the first and second annular

elastic members

15 and 16 reaching the maximum outer diameter portion. Is set to a size capable of applying a pressing force to the inclined surface and the inner wall surface of the pipe P before and after the expansion. Accordingly, the first and second annular

elastic members

15 and 16 move on the inclined surface while expanding the outer diameter while being compressed by the hydraulic pressure, and the inclined surface and the inner wall surface of the pipe member P as shown in FIG. Therefore, the liquid tightness inside the portion of the pipe P that is subject to the hydraulic pressure expansion can be secured.

The tapered inclined surfaces are provided on the first annular guide member 17 and the second annular guide member 18 disposed on the outer peripheral surfaces of the second cylindrical portion 13B and the third cylindrical portion 13C, respectively. Here, the annular side surfaces of the first and second

annular guide members

17 and 18 are formed as tapered inclined surfaces. Specifically, each of the first and second

annular guide members

17 and 18 is an annular body in which one annular end surface is formed into a taper shape centered on its own central axis. The first and second

annular guide members

17 and 18 have second and third

cylindrical portions

13B and 13B, respectively, so that the tapered inclined surfaces thereof face the respective annular end surfaces of the first cylindrical portion 13A. Insert 13C.

The first and second

annular guide members

17 and 18 are formed of a hard material such as metal that is not easily deformed by the pressing force from the first and second annular

elastic members

15 and 16. Therefore, the first and second annular

elastic members

15 and 16 move on the tapered inclined surfaces of the first and second

annular guide members

17 and 18 when pressed by hydraulic pressure. can do. The first and second

annular guide members

17 and 18 are shaped so that they can move in the axial direction on the outer peripheral surfaces of the second and third

cylindrical portions

13B and 13C, respectively. For example, the first and second

annular guide members

17 and 18 may be spline fitted to the second and third

cylindrical portions

13B and 13C, respectively. Therefore, the first and second

annular guide members

17 and 18 move in the axial direction by the pressing force from the first and second annular

elastic members

15 and 16 on the tapered inclined surfaces. (FIG. 2 → FIG. 5).

In the mandrel portion 13, as shown in FIG. 2-4, the first and second annular grooves 13d having the respective tapered inclined surfaces and the respective annular end surfaces of the first cylindrical portion 13A as side walls. 13e, and the first and second annular

elastic members

15, 16 are disposed in the first and second

annular grooves

13d, 13e. Therefore, the first and second annular

elastic members

15 and 16 are formed on the groove bottoms (on the outer peripheral surface of the mandrel portion 13) of the first and second

annular grooves

13d and 13e or on the tapered inclined surfaces by hydraulic pressure. Move.

Furthermore, on the outer peripheral surface of each of the second and third

cylindrical portions

13B and 13C, the other annular end face side of the first and second annular guide members 17 and 18 (the above-mentioned tapered inclined surface and The first and second annular

deformable members

19 and 20 having annular end surfaces that can come into contact with the end surfaces are also disposed on the opposite side. The first and second annular deforming

members

19 and 20 are annular bodies concentric with the inserted second and third

cylindrical portions

13B and 13C, and an axial pressing force is applied to the annular end surfaces. Thus, compression in the axial direction and expansion of the outer diameter by the pressing force are enabled. The first and second annular deforming

members

19 and 20 are shaped so that they can move in the axial direction on the outer peripheral surfaces of the second and third

cylindrical portions

13B and 13C, respectively.

Furthermore, on the outer peripheral surface of each of the second and third

cylindrical portions

13B and 13C, the other annular end face side of the first and second annular deformation members 19 and 20 (the first and second above-mentioned) is provided. The first and second

annular locking members

21 and 22 each having an annular end surface capable of contacting the respective end surfaces on the opposite side of the contact surface with the

annular guide members

17 and 18 are also provided. It is arranged. The first and second

annular locking members

21, 22 are arranged so that they do not move in the axial direction on the outer peripheral surfaces of the second and third

cylindrical portions

13B, 13C. It fixes with respect to

cylindrical part

13B, 13C. For example, here, the first and second

annular locking members

21 and 22 are screwed to the outer peripheral surfaces of the second and third

cylindrical portions

13B and 13C, respectively. Therefore, on the outer peripheral surfaces of the second cylindrical portion 13B and the third cylindrical portion 13C, when the hydraulic pressure is applied to the first and second annular

elastic members

15 and 16, the first and second annular elastic members 15 are applied. , 16, the first and second

annular guide members

17, 18, and the first and second

annular deformation members

19, 20 in the order of the axial pressing force are generated by the first and second

annular locking members

21, 22 acts. At that time, since the first and second

annular locking members

21 and 22 cannot move on the outer peripheral surfaces of the second and third

cylindrical portions

13B and 13C, the first and second annular

elastic members

15 and 16 can be moved. The movement of the first and second

annular guide members

17 and 18 and the first and second

annular deformation members

19 and 20 in the axial direction is stopped.

When the hydraulic pressure is generated, the first and second

annular deformation members

19 and 20 are sandwiched between the first and second

annular guide members

17 and 18 and the first and second

annular locking members

21 and 22. The pressing force from the first and second

annular guide members

17 and 18 is applied. Here, the first and second

annular deformation members

19 and 20 are compressed by the pressing force to expand the outer diameter, and the tube material P can be expanded by the pressing force accompanying the radial deformation. And decide on the material. The material is a soft material that can be compressed by the pressing force from the first and second

annular guide members

17 and 18 to expand the outer diameter, but the tube P can be expanded with the expansion. A material having sufficient hardness (for example, resin) is used. For example, the first and second

annular deformation members

19 and 20 are urethane rubber rings made of urethane. For this reason, the first and second

annular deformation members

19 and 20 are crushed in the axial direction by the pressing force, and the outer diameter is larger than before the pressing force is applied (FIG. 2 → FIG. 5). In this pipe expansion tool 1, the pipe P is expanded also by the expansion of the outer diameter of the 1st and 2nd

annular deformation members

19 and 20 in that case. Accordingly, the first and second annular deforming

members

19 and 20 have a pressing force from the first and second

annular guide members

17 and 18 so that the first and second annular deforming

members

19 and 20 can be expanded to at least an outer diameter suitable for their expansion. The material, thickness (outer diameter and inner diameter) and width (width in the axial direction) are determined in consideration. Here, the material should be able to return to its original shape when the pressing force from the first and second

annular guide members

17 and 18 is released so that it can withstand repeated use. desirable.

Thus, one liquid sealing part is the 1st cyclic | annular elastic member 15, the 1st cyclic | annular guide member 17, and the 1st cyclic | annular form which can move to the axial direction on the outer peripheral surface of the mandrel part 13 in order from the liquid discharge port 13c side. The deformable member 19 and a first annular locking member 21 that cannot move in the axial direction on the outer peripheral surface of the mandrel portion 13 are provided. Further, the other liquid sealing portion is, in order from the liquid discharge port 13c side, a second annular elastic member 16, a second annular guide member 18 and a second annular deformation member that can move in the axial direction on the outer peripheral surface of the mandrel portion 13. 20 and a second annular locking member 22 that cannot move in the axial direction on the outer peripheral surface of the mandrel portion 13.

In the tube expanding tool 1, when a high-pressure liquid is supplied, the first and second annular

elastic members

15, 16 and the first and second

annular guide members

17, 18 are pressed by the first and second annular

elastic members

15, 18. The outer diameters of the

annular deformation members

19 and 20 can be expanded, and the tube material P can be expanded until the outer diameter reaches the inner wall surface of the tube hole of the tube holding member S.

Here, in the tube expanding tool 1, the first and second annular

elastic members

15, 16 having an outer diameter smaller than the inner diameter of the pipe material P are guided to the first and second

annular guide members

17, 18 by hydraulic pressure. By moving the taper on the tapered inclined surface, the liquid tightness of the target site of the hydraulic pressure expansion is ensured by pressing the inclined surface and the inner wall surface of the pipe P. For this reason, the tube expansion tool 1 is already crimped to the inner wall surface of the pipe P before the hydraulic pressure is applied, and moves in the axial direction when the hydraulic pressure is applied to form an annular deformation member (urethane rubber ring). The first and second annular

elastic members

15 and 16 are improved in durability and the first and second annular

elastic members

15 and 16 are improved with respect to the above-described annular elastic member (O-ring) disclosed in Patent Document 1. It is possible to improve the liquid tightness due to. That is, the conventional annular elastic member repeatedly wears the outer peripheral surface with the inner wall surface of the pipe material P. On the other hand, the first and second annular

elastic members

15 and 16 of this embodiment can suppress such wear on the outer peripheral surface, so that the durability is improved. The first and second annular

elastic members

15 and 16 not only can suppress a decrease in liquid tightness accompanying an increase in durability, but also can push in a direction along a tapered inclined surface due to the hydraulic pressure. Since pressure is applied to the inclined surface and the inner wall surface of the pipe P with pressure (pressing force in the axial direction and in the radial direction due to the hydraulic pressure), the axial pressing direction in the radial direction due to its own elasticity and the axial direction due to the hydraulic pressure The liquid tightness is improved as compared with the conventional annular elastic member to which only pressing force can be applied. Further, in the tube expanding tool 1, the first and second annular deforming members 19, which are compressed by the axial pressing force from the first and second

annular guide members

17, 18 to expand the outer diameter, Since the pipe material P is expanded by 20 and the first and second annular

deformable members

19 and 20 are pressure-bonded to the inner wall surface of the pipe material P at that time, the liquid tightness can be improved. That is, at the time of the pipe expanding operation, the first and second annular

elastic members

15 and 16 guided by the first and second

annular guide members

17 and 18 and the first and second annular guide members 17. The first and second

annular deformation members

19 and 20 whose outer diameters are expanded by the pressing force from the first and

second pressure members

18 and 18 improve the liquid-tightness. For this reason, the tube expansion tool 1 can sufficiently secure the liquid tightness of the tube expansion target portion, and therefore, it is possible to perform an appropriate tube expansion operation on the pipe P target portion.

Further, since the first and second

annular deformation members

19 and 20 have a hardness that allows the pipe P to be expanded, but are formed of a soft material, the pipe P has a first shape as shown in FIG. In addition, the boundary between the portion expanded by the second annular

deformable members

19 and 20 and the portion not expanded is smoothly connected.

The first and second

annular positioning members

23 and 24 are disposed on the outer peripheral surfaces of the first and second

annular locking members

21 and 22, respectively. The first and second

annular positioning members

23 and 24 are positioning annular members (centering bands) for suppressing the deviation between the central axis of the tube material P and the central axis of the mandrel portion 13, and have an outer diameter thereof. It shape | molds so that it may become a magnitude | size substantially equivalent to the internal diameter of the pipe material P before pipe expansion. The outer diameter is made smaller than the inner diameter of the tube material P within a range that does not impair the insertability of the mandrel portion 13. The first and second

annular positioning members

23, 24 are, for example, screwed or fitted to the first and second

annular locking members

21, 22. In the tube expanding tool 1, the first and second annular elastic members 15 are equally applied to the inner wall surface of the portion subjected to the hydraulic pressure expansion in the pipe P by the first and second

annular positioning members

23 and 24. , 16 can be applied.

Further, although not described in detail, various annular members may be arranged on the outer peripheral surfaces of the second cylindrical portion 13B and the third cylindrical portion 13C. In that case, the annular member is formed with an inner peripheral surface so as to be screwed to the outer peripheral surface of the second cylindrical portion 13B or the third cylindrical portion 13C, and can be removed from the second cylindrical portion 13B or the third cylindrical portion 13C. It is preferable to keep it. It is preferable that the first and second

annular locking members

21 and 22 can be similarly removed. Thereby, since the 1st and 2nd cyclic | annular

elastic members

15 and 16 and the 1st and 2nd cyclic |

annular deformation members

19 and 20 can be removed from the 2nd cylindrical part 13B or the 3rd cylindrical part 13C, they are used. As a result, it can be exchanged when a decrease in liquid tightness or a decrease in tube expansion function is observed.

By the way, the first and second annular

elastic members

15 and 16 create a gap between the first and second annular

elastic members

15 and 16 until the first and second annular

elastic members

15 and 16 are pressure-bonded to the inner wall surface of the pipe material P by the hydraulic pressure. Therefore, a part of the liquid discharged from the liquid discharge port 13c may leak out from the gap until the gap is closed. The leaked liquid remains in a space formed between the first and second annular

elastic members

15 and 16 and the first and second

annular positioning members

23 and 24 after the gap is closed. The space is reduced as the first and second

annular deformation members

19 and 20 are deformed. Therefore, the liquid in the space loses its place when the volume of the space falls below that amount. At that time, the liquid that has lost its destination, for example, presses the inner wall surface of the pipe P in the radial direction, and tries to expand the pipe larger than necessary. However, in this example, since the amount of pipe expansion of the pipe material P is regulated by the diameter of the pipe hole of the pipe holding member S, the pipe is not expanded more than necessary. Therefore, for example, when the first and second

annular positioning members

23 and 24 are formed of a hard material such as metal, the first and second annular positioning members 23 are caused by the pressing force of the liquid that has lost its destination. , 24 may be disengaged from the first and second

annular locking members

21, 22. At that time, the function of positioning by the first and second

annular positioning members

23 and 24 deteriorates. For example, when the first and second

annular positioning members

23 and 24 are formed of a soft material such as urethane, the first and second annular positioning members 23 are caused by the pressing force of the liquid that has lost its destination. , 24 is deformed to an unexpected shape, and the pipe P is expanded to an unexpected shape, or the positioning function is lowered.

Therefore, the first and second

annular locking members

21 and 22 are arranged on the outer peripheral surfaces thereof on the side opposite to the above-mentioned space that can be formed on the respective end surface sides of the first and second

annular positioning members

23 and 24. At least one

communication groove

21a, 22a shown in FIGS. 6 and 7 for communicating with the space is formed. The

communication grooves

21a and 22a are not provided in the end surfaces of the first and second

annular locking members

21 and 22 in this example, but may be extended to at least one of the end surfaces. By providing

such communication grooves

21a and 22a, the liquid in the space can escape to the space on the opposite side via the

communication grooves

21a and 22a. Accordingly, in this case, the first and second

annular positioning members

23 and 24 are disengaged from the first and second

annular locking members

21 and 22 and the positioning function is reduced. Pipe expansion to the unexpected shape of the pipe material P accompanying the deformation of the

positioning members

23 and 24 can be suppressed.

In this example, the first and second

annular locking members

21 and 22 are provided with

communication grooves

21a and 22a, respectively, but this type of communication groove is formed by the first and second

annular locking members

21 and 22 respectively. Instead of or together with the

communication grooves

21a and 22a of the first and second

annular locking members

21 and 22, they may be provided on the inner peripheral surfaces of the first and second

annular positioning members

23 and 24, respectively. . Further, this kind of communication groove may be provided at least on the second annular locking member 22 side located on the distal end side of the mandrel portion 13.

This tube expansion tool 1 is difficult to expand the tube P in the vicinity of the first annular positioning member 23 as shown in FIG. For this reason, when the above-described roller expansion is performed prior to this hydraulic expansion step, the tube P is expanded between the end portion of the end of the expansion by the roller expansion and the expansion expansion portion of the hydraulic expansion. The unfinished part remains. For this reason, after the hydraulic pressure expansion is completed, the roller expansion is performed again in order to expand the unexpanded portion of the expansion. The roller expansion at that time is called a so-called well-known one-step roller expansion. That is, the tube expansion tool 1 of the present embodiment is applied to a tube expansion method for performing tube expansion work through at least a roller tube expansion step, a hydraulic pressure tube expansion step, and a roller tube expansion step, for example, in Japanese Patent Laid-Open No. 2008-025918 (Patent Document 5) described above. It is also possible to apply to the tube expansion method described.

Here, in the mandrel portion 13 of the present embodiment, the outer diameter of the first cylindrical portion 13A is larger than the outer diameters of the second and third

cylindrical portions

13B and 13C. The

annular grooves

13d and 13e are formed. For this reason, in this example, the first and second annular

elastic members

15 and 16 are disposed in the first and second

annular grooves

13d and 13e. On the other hand, the mandrel part 13 may change the outer diameter of the first cylindrical part 13A to the same size as the outer diameters of the second and third

cylindrical parts

13B and 13C, instead of the illustration. Even in this case, the tube expanding tool 1 can perform the tube expanding operation similar to the above example by providing the liquid discharge port 13c between the first and second annular

elastic members

15 and 16. Thus, the same effect as that illustrated can be achieved.

As a specific application example of the tube expansion tool shown above, for example, a nuclear power plant can be considered. The code | symbol 100 of FIG. 8 shows an example of a nuclear power plant.

The nuclear power plant 100 exemplified here is a pressurized water light water reactor nuclear power generation facility. In this nuclear power plant 100, the reactor 120, the pressurizer 130, the steam generator 140, and the pump 150 are sequentially connected by a primary coolant pipe 160 in the reactor containment vessel 110, thereby circulating a primary coolant circulation path (primary System circulation path). In the nuclear power plant 100, a circulation path (secondary system circulation path) of the secondary coolant (water) is formed between the steam generator 140 and the turbine 210.

In this nuclear power plant 100, first, the primary coolant is heated to a high temperature and a high pressure by the reactor 120, and this is pressurized by the pressurizer 130 and supplied to the steam generator 140 while the pressure is maintained constant. . In the steam generator 140, heat exchange between the primary coolant and the secondary coolant is performed, whereby the secondary coolant evaporates and becomes steam. In the nuclear power plant 100, the secondary coolant that has become the steam is supplied to the turbine 210, whereby the turbine 210 is driven and power is supplied to the generator 220. The primary coolant that has been subjected to heat exchange by the steam generator 140 is recovered by the reactor 120 through the primary coolant pipe 160 as the pump 150 is driven. Further, the secondary coolant that has passed through the turbine 210 is cooled by the condenser 230 and then recovered by the steam generator 140 through the secondary coolant tube 240.

As shown in FIG. 9, the steam generator 140 includes a body portion 141, a plurality of heat transfer tubes 142, a steam / water separator 143, and a moisture separator 144.

The body 141 has a substantially cylindrical shape and a hollow hermetic structure, and is arranged with the longitudinal direction oriented in the vertical direction. In addition, the body 141 has a pair of

water chambers

1413 and 1414 formed by a tube plate 1411 and a partition plate 1412 at the bottom. One water chamber 1413 is connected to the pressurizer 130 side of the primary coolant pipe 160 via the inlet side nozzle 1415. The other water chamber 1414 is connected to the pump 150 side of the primary coolant pipe 160 via the outlet side nozzle 1416.

The heat transfer tube 142 has a substantially U-shape, and is arranged in the body 141 with both ends directed vertically downward. Each of the heat transfer tubes 142 is supported in a state where each end portion is inserted into the tube plate 1411, and one of the heat transfer tubes 142 is opened in the water chamber 1413 on the inlet side, and the other is opened in the water chamber 1414 on the outlet side. I am letting. Here, a cylindrical tube group outer tube 145 is disposed in the body 141 at a vertically upper portion of the tube plate 1411, and each heat transfer tube 142 is disposed in the tube group outer tube 145. Further, since a plurality of tube support plates 146 are arranged at predetermined intervals in the longitudinal direction in the tube group outer tube 145, each heat transfer tube 142 is inserted into each of the tube support plates 146. Support in the state. The tube group outer cylinder 145 is disposed in a state where a gap is formed with respect to the inner wall of the body 141.

The steam / water separator 143 and the moisture separator 144 are arranged on the upper part of the body 141. The steam separator 143 is a device that separates feed water into steam and hot water. The moisture separator 144 is a device that removes moisture from the separated steam and brings it into a state close to dry steam.

In the steam generator 140, a primary coolant (for example, light water that can be used as a reactor coolant and a neutron moderator) flows from the inlet side nozzle 1415 into the inlet side water chamber 1413, passes through the heat transfer tube 142, and is on the outlet side. The water chamber 1414 is discharged from the outlet side nozzle 1416 to the outside. Further, the secondary coolant is introduced from the water supply pipe 1417 into the body 141 and passes through the pipe group outer cylinder 145. At this time, in the steam generator 140, heat exchange between the primary coolant and the secondary coolant is performed via the heat transfer tube 142, and the secondary coolant is heated. In the steam generator 140, the secondary coolant passes through the steam separator 143 and the moisture separator 144, whereby the steam component of the secondary cooling water is taken out and supplied to the turbine 210 side. .

In the manufacturing process, the steam generator 140 inserts the heat transfer tube 142 as the tube material P into the tube hole of the tube plate 1411 as the tube holding member S, and pushes the heat transfer tube 142 from the inside to expand the tube hole. To fix. Therefore, the tube expansion tool 1 of the present embodiment can be used for attaching the heat transfer tube 142 and the tube plate 1411.

As described above, the tube expansion tool according to the present invention is useful for a technique that enables an appropriate tube expansion operation for a tube expansion target portion.

DESCRIPTION OF SYMBOLS 1 Tube expansion tool 11 Base 12

Liquid introduction part

11a, 12a, 13a, 13b Through-hole 13 Mandrel part 13c

Liquid discharge port

13A, 13B, 13C 1st-3rd

cylindrical part

15,16 1st and 2nd annular

elastic member

17, 18 First and second

annular guide members

19, 20 First and second

annular deformation members

21, 22 First and second

annular locking members

21a,

22a Communication grooves

23, 24 First and second Annular positioning member 140 steam generator 142 heat transfer tube 1411 tube plate P tube material

Claims

A mandrel portion that is inserted into the tube material inserted into the tube hole of the tube holding member, and that the tube material is expanded from the inside by the pressure of the liquid supplied from the liquid discharge port and fixed to the tube hole; and the mandrel portion In the tube expansion tool provided with two liquid sealing portions that are arranged at an interval in the axial direction on the outer peripheral surface of the two, and suppress leakage of the liquid to the outside than between the two,
The liquid sealing portion includes an annular elastic member, an annular guide member, and an annular deformation member that are movable in the axial direction on the outer peripheral surface of the mandrel portion in order from the liquid discharge port side, and an outer periphery of the mandrel portion. An annular locking member that is immovable in the axial direction on the surface, and
The annular guide member has a tapered inclined surface facing the annular elastic member,
The annular elastic member is shaped so that the outer diameter is smaller than the inner diameter of the tubular material and can move along the axial direction on the inclined surface of the annular guide member,
The tube expanding tool, wherein the annular deforming member is formed to be compressed by an axial pressing force from the annular guide member so as to expand an outer diameter.
The tube expansion tool according to claim 1, wherein an annular positioning member having an outer diameter equivalent to the inner diameter of the tube material is provided on an outer peripheral surface of each of the annular locking members.
At least one of the annular locking member and the annular positioning member arranged at least on the distal end side of the mandrel portion is provided with a communication groove for communicating a space formed on each annular end surface side of the annular positioning member. The tube expansion tool according to claim 2, wherein: