JP2014035161A - Heat exchanger and additional installation method for vibration suppression members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger or the like that can appropriately suppress vibration of a plurality of heat transfer tubes.SOLUTION: The heat exchanger includes: a plurality of heat transfer tubes 5 provided side by side with predetermined gaps between them; and a plurality of second vibration suppression members 14B which are provided in the gaps and are provided at both sides of each of the plurality of heat transfer tubes 5 with each of the heat transfer tubes 5 interposed between them. The plurality of second vibration suppression members 14B are arranged in such a manner that the second vibration suppression member 14B on one side and the second vibration suppression member 14B on the other side are arranged with the heat transfer tubes 5 interposed between them and are provided at positions different from each other in an axial direction of the heat transfer tubes 5, the second vibration suppression members 14B on one side are provided so as to press the heat transfer tubes 5 and the second vibration suppression members 14B on the other side are provided so as to press the heat transfer tubes 5 from a side opposite from the second vibration suppression member 14B on one side.

Description

  The present invention relates to a heat exchanger having a plurality of heat transfer tubes therein and a method for additionally installing a vibration suppressing member provided in the heat exchanger.

  Conventionally, a heat exchanger such as a steam generator in which a plurality of U-shaped heat transfer tubes are provided is known (see, for example, Patent Document 1). In this heat exchanger, a plurality of heat transfer tubes are provided in parallel, and a fluid such as a heat medium circulates inside each heat transfer tube. When the fluid flows through the inside of the heat transfer tube, vibration (fluid excitation vibration) due to the flow of the fluid occurs in the U-shaped arc portion of the heat transfer tube. For this reason, in the heat exchanger, a V-shaped steadying metal fitting is inserted as a vibration suppressing member in the gap between the heat transfer tubes serving as arc portions. And the vibration suppression member inserted has contacted the heat exchanger tube, and is suppressing the fluid excitation vibration.

JP 61-291896 A

  Here, since the vibration suppressing member is inserted into the gap between adjacent heat transfer tubes, the vibration suppression member is disposed on both sides of the heat transfer tubes. Usually, the vibration suppressing members arranged on both sides of the heat transfer tube are in the same position in the axial direction. At this time, the gaps of the heat transfer tubes are not necessarily constant due to dimensional tolerance due to variations in the flatness of the heat transfer tubes in the arc portion. Here, the heat transfer tube flattening amount means a difference between the maximum outer diameter and the minimum outer diameter in one cross section orthogonal to the longitudinal direction of the heat transfer tube. For this reason, some vibration suppression members do not contact | abut the vibration suppression member among several vibration suppression members, and a clearance gap arises between a vibration suppression member and a heat exchanger tube. In this case, since it becomes difficult to suppress the vibration of the heat transfer tube, there is a possibility that the heat transfer tube and the vibration suppressing member come into contact with each other due to the vibration, and the contact portion is worn.

  Then, this invention makes it a subject to provide the additional method of the heat exchanger which can suppress suitably the vibration of a some heat exchanger tube, and a vibration suppression member.

  A heat exchanger according to the present invention includes a plurality of heat transfer tubes provided side by side with a predetermined gap, and at least a pair of vibration suppression members provided on both sides of each heat transfer tube. The pair of vibration suppression members are provided at positions where one vibration suppression member and the other vibration suppression member are different in the axial direction of the heat transfer tube, and one vibration suppression member is provided by pressing the heat transfer tube, The other vibration suppression member is provided by pressing the heat transfer tube from the side opposite to the one vibration suppression member.

  According to this configuration, the heat transfer tubes can be alternately pressed along the axial direction by the pair of vibration suppressing members. For this reason, since a pair of vibration suppression member can be made to contact each heat exchanger tube without a gap, it becomes possible for a pair of vibration suppression members to suppress vibration of each heat exchanger tube suitably. Therefore, wear at the contact portion between the heat transfer tube and the vibration suppressing member can be reduced.

  In this case, a plurality of vibration suppression members are provided in the gap, and the plurality of vibration suppression members include a plurality of existing first vibration suppression members and a plurality of newly added second vibration suppression members. The second vibration suppressing members provided on both sides of each heat transfer tube are preferably provided at different positions in the axial direction of each heat transfer tube.

  According to this configuration, by newly adding the second vibration suppression member to the existing first vibration suppression member, the heat transfer tubes are alternately pressed along the axial direction by the plurality of vibration suppression members. can do. For this reason, since it is possible to bring the plurality of vibration suppression members into contact with the heat transfer tubes without any gap simply by additionally installing the second vibration suppression member, it is possible to suitably suppress the vibrations of the heat transfer tubes.

  In this case, it is preferable that the second vibration suppression member has a longer length in the width direction, which is a direction in which adjacent heat transfer tubes face each other, as compared to the first vibration suppression member.

  According to this configuration, the second vibration suppression member to be additionally installed can be made wider than the first vibration suppression member. For this reason, when the first vibration suppression member and the second vibration suppression member are disposed in the gap between the heat transfer tubes, the second vibration suppression member expands the gap as compared with the first vibration suppression member. As compared with the first vibration suppressing member, the heat transfer tube can be pressed more. For this reason, since the heat transfer tube can be positively pressed by the newly added second vibration suppressing member, vibration of each heat transfer tube can be suitably suppressed.

  In this case, it is preferable that the second vibration suppressing member has a rectangular cross section cut by a plane orthogonal to the insertion direction inserted into the gap.

  According to this configuration, since the contact portion between the heat transfer tube and the second vibration suppressing member can be made in line contact, the contact portion can be enlarged, and the load of pressing the second vibration suppressing member against the heat transfer tube can be dispersed. Can do.

  In this case, it is preferable that the second vibration suppressing member has a circular cross section cut by a plane orthogonal to the insertion direction inserted into the gap.

  According to this configuration, since the contact portion between the heat transfer tube and the second vibration suppression member can be point contact, the contact portion can be reduced, and the frictional resistance during insertion of the second vibration suppression member can be reduced. it can.

  In this case, the second vibration suppressing member is preferably formed in a taper shape that tapers from the rear end side to the front end side in the insertion direction inserted into the gap.

  According to this configuration, since the distal end side in the insertion direction is thin, the second vibration suppressing member can be easily inserted into the gap between the heat transfer tubes.

  The vibration suppression member additional method according to the present invention is for an existing heat exchanger including a plurality of heat transfer tubes provided side by side with a predetermined gap and a plurality of first vibration suppression members provided in the gap. A method of additionally installing a vibration suppression member for newly adding a second vibration suppression member, wherein the plurality of first vibration suppression members are provided on both sides of each heat transfer tube, and the shaft of each heat transfer tube Provided in the same position in the direction, the plurality of second vibration suppression members are provided on both sides of each heat transfer tube, provided between the first vibration suppression members adjacent in the axial direction of the heat transfer tube, and It is provided at different positions in the axial direction of the heat transfer tube.

  According to this configuration, by newly adding the second vibration suppression member to the existing heat exchanger including the plurality of heat transfer tubes and the plurality of first vibration suppression members, by the plurality of second vibration suppression members, Each heat transfer tube can be alternately pressed along its axial direction. For this reason, since it is possible to bring the plurality of second vibration suppression members into contact with the heat transfer tubes without gaps by simply installing the second vibration suppression member, vibrations of the heat transfer tubes can be suitably suppressed. It becomes. Therefore, wear at the contact portion between the heat transfer tube and each vibration suppressing member can be reduced.

1 is a schematic side sectional view of a steam generator according to a first embodiment. FIG. 2 is a schematic plan view of the heat transfer tube group. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic perspective view of the heat transfer tube group. FIG. 5 is a plan view of a part of the heat transfer tube group as viewed from above. FIG. 6 is a plan view of a part of the heat transfer tube group before the second vibration suppressing member is disposed as viewed from above. FIG. 7 is a plan view of a part of the heat transfer tube group of the steam generator according to the second embodiment as viewed from above. FIG. 8 is a plan view of a part of the heat transfer tube group of the steam generator according to the third embodiment as viewed from above. FIG. 9 is a three-side view of the second vibration suppressing member disposed in the heat transfer tube group of the steam generator according to the fourth embodiment. FIG. 10 is a plan view of a part of the heat transfer tube group of the steam generator according to the fifth embodiment as viewed from above. FIG. 11 is a flowchart regarding a method for additionally installing a vibration suppressing member.

  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.

  1 is a schematic side sectional view of a steam generator according to a first embodiment. As a heat exchanger having a plurality of heat transfer tubes inside, for example, there is a steam generator 1 used in a pressurized water reactor (PWR). A primary coolant (for example, light water) as a reactor coolant and a neutron moderator flowing in the reactor and a secondary coolant flowing in the turbine flow into the steam generator 1. In the steam generator 1, the primary coolant that has become high temperature and high pressure is subjected to heat exchange with the secondary coolant, thereby evaporating the secondary coolant to generate steam, and primary cooling that has become high temperature and pressure. The material is cooling.

  The steam generator 1 has a hollow cylindrical shape extending in the vertical direction and sealed. The steam generator 1 has a trunk portion 2 whose 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 51 is provided in the tube group outer tube 3. The heat transfer tube group 51 includes a plurality of heat transfer tubes 5 having an inverted U shape. Each of the heat transfer tubes 5 is arranged so that the U-shaped arc portion is convex upward, and both end portions on the lower side are supported by the tube plate 4, and the intermediate portion includes a plurality of tube support plates 6. And is supported by the tube group outer tube 3. A large number of through holes (not shown) are formed in the tube support plate 6, and the heat transfer tubes 5 are inserted into the through holes.

  The body 2 is provided with a water chamber 7 at its lower end. The water chamber 7 is divided into an entrance chamber 71 and an exit chamber 72 by a partition wall 8. The entrance chamber 71 communicates with one end of each heat transfer tube 5, and the exit chamber 72 communicates with the other end of each heat transfer tube 5. The entrance chamber 71 is formed with an inlet nozzle 74 that communicates with the outside of the body portion 2, and the exit chamber 72 is formed with an exit nozzle 75 that communicates with the exterior of the body portion 2. The inlet nozzle 74 is connected to a cooling water pipe (not shown) through which a primary coolant is sent from the pressurized water reactor, and the outlet nozzle 75 passes the primary coolant 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, the steam / water separator 9 that separates the secondary coolant after heat exchange into steam (gas phase) and hot water (liquid phase), and the moisture content of the separated steam A moisture separator 10 is provided to remove the water and bring it to a state close to dry steam. Between the steam / water separator 9 and the heat transfer tube group 51, a water supply pipe 11 for supplying water of the secondary coolant 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. In addition, the body part 2 has a tube plate in which a secondary coolant supplied from the water supply pipe 11 into the body part 2 flows down between the body part 2 and the tube group outer cylinder 3 in the lower half part. A water supply path 13 that is folded back at 4 and raised along the heat transfer tube group 51 is formed. 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 coolant is connected.

  In such a steam generator 1, the primary coolant heated in the pressurized water reactor is sent to the entrance chamber 71, circulates through the numerous heat transfer tubes 5, and reaches the exit chamber 72. On the other hand, the secondary coolant cooled by the condenser is sent to the water supply pipe 11 and rises along the heat transfer pipe group 51 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 coolant and the secondary coolant in the body portion 2. Then, the cooled primary coolant is returned from the exit chamber 72 to the pressurized water reactor. On the other hand, the secondary coolant that has exchanged heat with the high-pressure and high-temperature primary coolant rises in the body 2 and is separated into steam and hot water by the steam / water separator 9. The separated steam is sent to the turbine after moisture is removed by the moisture separator 10.

  In the steam generator 1 configured as described above, when the primary coolant passes through each heat transfer tube 5, fluid-excited vibration is generated in the inverted U-shaped arc portion. Therefore, a plurality of vibration suppressing members 14 that suppress vibration of the heat transfer tube 5 are provided in the arc portion of the heat transfer tube 5.

  FIG. 2 is a schematic plan view of the heat transfer tube group. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic perspective view of the heat transfer tube group. FIG. 5 is a plan view of a part of the heat transfer tube group as viewed from above. FIG. 6 is a plan view of a part of the heat transfer tube group before the second vibration suppressing member is disposed as viewed from above.

  The upper end portion of the heat transfer tube group 51 is formed in a hemispherical shape by arranging arc portions of a plurality of heat transfer tubes 5 having an inverted U shape. That is, as shown in FIG. 3, each heat transfer tube 5 is bent with a predetermined curvature radius in the plane. For this reason, the heat transfer tube 5 is formed symmetrically with a center plane C that is an axial cross section of the heat transfer tube 5 passing through the apex that is the center of the arc portion and the center of the radius of curvature. The plurality of heat transfer tubes 5 are provided so that the radius of curvature increases toward the outside in the radial direction of the curvature radius in each plane, and the heat transfer tube layers 5A are provided so that the axial directions are parallel to each other. Become.

  As shown in FIG. 2, the heat transfer tube layers 5 </ b> A are arranged in parallel with a predetermined gap in an out-of-plane direction orthogonal to the plane. In the plurality of heat transfer tube layers 5A, the curvature radius of each heat transfer tube 5 on the outermost side in the radial direction of the radius of curvature in the plane decreases toward the outside in the out-of-plane direction. By arranging the plurality of heat transfer tubes 5 in this manner, the upper end portion of the heat transfer tube group 51 is formed in a hemispherical shape.

  As shown in FIG. 4, the plurality of vibration suppressing members 14 are respectively inserted between the plurality of heat transfer tube layers 5A arranged in parallel. Each vibration suppressing member 14 is made of a metal material such as stainless steel, for example. The plurality of vibration suppressing members 14 are disposed after the assembly of the plurality of first vibration suppressing members 14A and the steam generator 1 (for example, after the steam generator 1 is installed) disposed when the steam generator 1 is assembled. And a plurality of second vibration suppressing members 14B. FIG. 4 illustrates a part of the second vibration suppressing member 14B that is additionally provided, and is not limited to the arrangement illustrated in FIG.

  As shown in FIG. 3, the first vibration suppressing member 14A is formed by bending a rod having a rectangular cross section into a substantially V shape. 14 A of 1st vibration suppression members are arrange | positioned so that the bent part bent may be located in the radial direction center side (inner side) in the curvature radius of the heat exchanger tube 5, and the both ends may be located in the radial direction outer side Be placed. Both end portions of the first vibration suppressing member 14A protrude outward from the heat transfer tube 5 on the outermost side in the radial direction of the radius of curvature.

  As shown in FIG. 3, the plurality of first vibration suppression members 14A include a first vibration suppression member 14A having a large V shape and a first vibration suppression member 14A having a small V shape. The first vibration suppression member 14A having a small V shape is disposed inside the first vibration suppression member 14A having a large V shape, thereby forming a pair. For example, three pairs of first vibration suppressing members 14A that form a pair are disposed in a gap between two heat transfer tube layers 5A that are adjacent (stacked) in the out-of-plane direction. 14 A of 1st vibration suppression members used as 3 sets of pairs are provided along the circumferential direction of a curvature radius. That is, of the three sets, the first vibration suppressing member 14A that is a pair of the first vibration suppressing member 14A that is provided at the center so that the bent portion is located on the center plane C, A pair of first vibration suppressing members 14 </ b> A is provided on each of both sides.

  As described above, the plurality of first vibration suppressing members 14 </ b> A are disposed, and as shown in FIG. 4, the end portions of the plurality of first vibration suppressing members 14 </ b> A are hemispherical arcs of the heat transfer tube group 51. Are arranged in a row in the out-of-plane direction of the heat transfer tube layer 5A, that is, the direction in which the heat transfer tubes 5 face each other. Further, the end portions of the first vibration suppressing members 14A in a row are arranged in a plurality of rows at predetermined intervals along the in-plane direction of the heat transfer tube layer 5A along the hemispherical arc of the heat transfer tube group 51. The That is, since the end portions of the first vibration suppression members 14A provided on both sides of each heat transfer tube 5 are provided at the same position in the axial direction of each heat transfer tube 5, a plurality of first vibration suppression members 14A. These end portions are arranged in a grid pattern.

  As shown in FIGS. 5 and 6, the end portions of the plurality of first vibration suppressing members 14 </ b> A are arranged in a lattice shape, so that the heat transfer tube layer 5 </ b> A has a plurality of gaps in the axial direction of the heat transfer tube 5. It is divided into a plurality of sections in the direction in which the heat transfer tubes 5 are arranged. That is, the gaps between the heat transfer tube layers 5A are partitioned into a plurality of regions S so as to form a lattice shape. For this reason, the gap of the heat transfer tube layer 5A is defined by the first vibration suppressing member 14A.

  15 A of joining members are each provided in the both ends of each 1st vibration suppression member 14A. The joining member 15A is joined to a holding member 16A described later, as shown in FIGS. The joining member 15A is made of a metal material such as stainless steel, for example.

  As shown in FIGS. 2 and 4, the holding member 16 </ b> A is a rod formed in an arc shape along the hemispherical outer periphery of the heat transfer tube group 51. The holding member 16 </ b> A is arranged so as to connect the end portions of the first vibration suppressing members 14 </ b> A arranged in a line along the hemispherical arc of the heat transfer tube group 51. And 15 A of joining members provided in the edge part of each 1st vibration suppression member 14A are joined to this holding member 16A by welding. An attachment member 17 described later is joined to the holding member 16A by welding or the like.

  The attachment member 17 is formed in a substantially U-shape, and is inserted between the heat transfer tube 5 on the outermost side in the radial direction of the radius of curvature and the heat transfer tube 5 on the inner side. And the holding member 16A is attached to the heat exchanger tube group 51 by joining the both ends of the attachment member 17 to the holding member 16A by welding or the like.

  In addition, although the 1st vibration suppression member 14A used the V-shaped thing, the thing of a rectangular parallelepiped shape (linear shape) is used, or the thing of a V shape and a rectangular parallelepiped shape are used together. There is no particular limitation.

  As shown in FIGS. 3 and 5, the second vibration suppressing member 14 </ b> B is a rectangular parallelepiped (straight line) rod having a rectangular cross section. That is, the second vibration suppression member 14B has a rectangular cross section cut by a plane orthogonal to the insertion direction inserted into the gap. The second vibration suppressing member 14B is arranged so that its longitudinal direction is the same as the radial direction of the radius of curvature. That is, the second vibration suppressing member 14B is disposed so that one end portion in the longitudinal direction thereof is positioned on the center side (inner side) in the radial direction of the radius of curvature of the heat transfer tube 5, and the other end portion in the longitudinal direction is disposed in the radial direction. It arrange | positions so that it may be located outside. For this reason, the second vibration suppressing member 14B has one end side in the longitudinal direction serving as the distal end side in the insertion direction and the other end side in the longitudinal direction serving as the rear end side in the insertion direction. Inserted. The other end of the second vibration suppressing member 14B protrudes outward from the heat transfer tube 5 located on the outermost side in the radial direction of the radius of curvature.

  For example, the plurality of second vibration suppressing members 14B are arranged in two gaps respectively formed on both sides of the predetermined heat transfer tube layer 5A in the out-of-plane direction (the front-rear direction in FIG. 3). The first vibration suppressing member 14A is disposed between them. Specifically, three eleven second vibration suppression members 14B are provided for each pair of first vibration suppression members 14A, and three pairs of first vibration suppression members 14A. There are two in between. One of the three second vibration suppression members 14B provided for the pair of first vibration suppression members 14A is provided inside the first vibration suppression member 14A having a small V shape. The remaining two second vibration suppression members 14B are respectively provided between both end portions of the first vibration suppression member 14A having a small V shape and both end portions of the first vibration suppression member 14A having a large V shape. The two second vibration suppressing members 14B provided between the three pairs of first vibration suppressing members 14A include a pair of first vibration suppressing members 14A provided at the center and both sides thereof. Are provided between the pair of first vibration suppressing members 14 </ b> A that are paired with each other.

  Five eleven second vibration suppression members 14B are provided in one (front of FIG. 3) gap and six are provided in the other (backward of FIG. 3) gap. The five second vibration suppression members 14B provided in one gap form three sets of pairs with the three second vibration suppression members 14B provided inside the first vibration suppression member 14A having a small V shape. It comprises two second vibration suppressing members 14B provided between the first vibration suppressing members 14A. The six second vibration suppression members 14B provided in the other gap are between both ends of the first vibration suppression member 14A having a small V shape and both ends of the first vibration suppression member 14A having a large V shape. Each of the two second vibration suppressing members 14B is provided.

  For this reason, as shown in FIGS. 3 and 5, the eleventh second vibration suppression members 14 </ b> B connect the heat transfer tubes 5 in two gaps formed on both sides of the predetermined heat transfer tube layer 5 </ b> A in the out-of-plane direction. Provided on both sides of the heat exchanger tube 5 and arranged alternately at a predetermined interval along the axial direction of the heat transfer tube 5. In other words, the second vibration suppressing members 14 </ b> B provided on both sides of each heat transfer tube 5 are provided at different positions in the axial direction of the heat transfer tube 5. That is, the plurality of second vibration suppressing members 14B are arranged in a staggered manner.

  At this time, the second vibration suppression member 14B has a length in the width direction that is a direction in which the adjacent heat transfer tubes 5 face each other, that is, a length in the out-of-plane direction, in the width direction of the first vibration suppression member 14A. It is formed longer than That is, the second vibration suppressing member 14B is formed wider than the first vibration suppressing member 14A.

  From the above, as shown in FIG. 5, the plurality of first vibration suppression members 14A are arranged in a lattice pattern, the plurality of second vibration suppression members 14B are arranged in a staggered pattern, and the second vibration suppression member 14B is the first vibration suppression member 14B. It is formed wider than the vibration suppressing member 14A. For this reason, the plurality of second vibration suppressing members 14 </ b> B have positions where the second vibration suppressing member 14 </ b> B on one side and the second vibration suppressing member 14 </ b> B on the other side are different in the axial direction of the heat transfer tube 5 with the heat transfer tube 5 interposed therebetween. The second vibration suppression member 14B on one side is provided by pressing the heat transfer tube 5, and the second vibration suppression member 14B on the other side is from the side opposite to the second vibration suppression member 14B on the one side. It is provided by pressing the heat transfer tube 5. Accordingly, the plurality of second vibration suppressing members 14B are arranged in such a manner that the heat transfer tubes 5 are staggered in the direction in which the heat transfer tubes 5 face each other at different positions in the axial direction of the heat transfer tubes 5, that is, in the out-of-plane direction of the heat transfer tube layer 5A. Can be pressed. In other words, the heat transfer tubes 5 are alternately pressed along the axial direction of the heat transfer tubes 5 by the plurality of second vibration suppressing members 14B provided on both sides thereof.

  Here, since the second vibration suppression member 14B is formed in a rectangular cross section and each heat transfer tube 5 is a round tube, the second vibration suppression member 14B and the heat transfer tube 5 are in line contact. In FIG. 5, each heat transfer tube 5 pressed by the plurality of second vibration suppressing members 14 </ b> B is distorted in an S-shape, but this easily illustrates the phenomenon that the heat transfer tube 5 is pressed. It is shown for explanation, and the actual heat transfer tube 5 is not distorted as shown in FIG.

  As described above, since the plurality of second vibration suppression members 14B are arranged, the illustration of the second vibration suppression members 14B is omitted. The heat transfer tube group 51 is arranged in a line along the hemispherical arc in the out-of-plane direction of the heat transfer tube layer 5A. Further, the end portions of the second vibration suppressing members 14B in a row are arranged in a plurality of rows at predetermined intervals along the in-plane direction of the heat transfer tube layer 5A along the hemispherical arc of the heat transfer tube group 51. The

  Each of the second vibration suppressing members 14B is provided with a joining member 15B at the other end (a radially outer end). As shown in FIGS. 2 and 3, the joining member 15B is joined to a holding member 16B described later. The joining member 15B is made of a metal material such as stainless steel, for example.

  As shown in FIG. 2, the holding member 16 </ b> B is substantially the same as the holding member 16 </ b> A, and is a rod formed in an arc shape along the hemispherical outer periphery of the heat transfer tube group 51. The holding member 16B is disposed so as to connect the end portions of the second vibration suppressing members 14B arranged in a line along the hemispherical arc of the heat transfer tube group 51. For this reason, the holding member 16B is disposed between the adjacent holding members 16A. And the joining member 15B provided in the other end part of each 2nd vibration suppression member 14B is joined to this holding member 16B by welding etc. FIG.

  Next, with reference to FIG. 5, FIG. 6 and FIG. 11, a description will be given of a method of additionally installing a vibration suppression member for newly adding a plurality of second vibration suppression members 14B to the existing steam generator 1 installed. To do. FIG. 11 is a flowchart regarding a method for additionally installing a vibration suppressing member.

  As shown in FIG. 6, in the existing steam generator 1 before the second vibration suppressing member 14B is disposed, the heat transfer tube group 51 includes a plurality of heat transfer tube layers 5A (in FIG. 6, only the outermost heat transfer tube 5 is shown. ) Are disposed with a predetermined gap therebetween, whereby the plurality of heat transfer tubes 5 are parallel to each other. Moreover, the edge part of several 1st vibration suppression member 14A is arrange | positioned at a grid | lattice form by providing the several 1st vibration suppression member 14A used as V shape in the clearance gap between the adjacent heat exchanger tube layers 5A. Further, the gaps between adjacent heat transfer tube layers 5A are partitioned into a plurality of regions S having a lattice shape by the end portions of the plurality of first vibration suppressing members 14A provided in a lattice shape.

  As shown in FIG. 5, the plurality of second vibration suppressing members 14B are inserted in a staggered manner into the plurality of regions S having a lattice shape (member insertion step: step S11 in FIG. 11). Specifically, the second vibration suppressing member 14B is inserted into a predetermined gap of the heat transfer tube layer 5A and then inserted into a predetermined gap of the heat transfer tube layer 5A adjacent in the out-of-plane direction. Then, by repeating this insertion a plurality of times, the plurality of second vibration suppression members 14B are arranged in a staggered manner with respect to the plurality of regions S having a lattice shape.

  First, in a predetermined gap of the heat transfer tube layer 5A, the second vibration suppression member 14B is a region in which the second vibration suppression member 14B is inserted into the region S divided into a plurality along the axial direction of the heat transfer tube 5. S and the region S in which the second vibration suppressing member 14B is not inserted are inserted so as to alternate along the axial direction of the heat transfer tube 5. At this time, one second vibration suppression member 14 </ b> B is disposed at the center of the region S in the axial direction of the heat transfer tube 5. In addition, when inserting the 2nd vibration suppression member 14B in a clearance gap, a clearance gap may be expanded beforehand using a predetermined jig | tool, and may be expanded by the 2nd vibration suppression member 14B to insert.

  Thereafter, when the second vibration suppression member 14B is inserted into a predetermined gap of the heat transfer tube layer 5A, the second vibration suppression member 14B is subsequently inserted into a predetermined gap of the heat transfer tube layer 5A adjacent in the out-of-plane direction. In a predetermined gap between the heat transfer tube layers 5 </ b> A adjacent in the out-of-plane direction, the second vibration suppression member 14 </ b> B has a second vibration suppression member 14 </ b> B with respect to the region S divided into a plurality along the axial direction of the heat transfer tube 5. The regions S to be inserted and the regions S in which the second vibration suppressing member 14 </ b> B is not inserted are inserted so as to alternate along the axial direction of the heat transfer tube 5. At this time, in the second vibration suppression member 14B, the regions S in which the second vibration suppression member 14B is inserted and the regions S in which the second vibration suppression member 14B are not inserted alternately in the out-of-plane direction of the heat transfer tube layer 5A. It is inserted to become.

  Then, the second vibration suppressing member 14B is inserted into the predetermined gap of the heat transfer tube layer 5A, and the second vibration suppressing member 14B is inserted into the predetermined gap of the heat transfer tube layer 5A adjacent to the predetermined gap in the out-of-plane direction. Are repeatedly performed, the plurality of second vibration suppressing members 14B are arranged in a staggered manner with respect to the plurality of regions S having a lattice shape. The other end portions of the plurality of second vibration suppressing members 14B arranged in a staggered manner are arranged in a line along the hemispherical arc of the heat transfer tube group 51 in the out-of-plane direction of the heat transfer tube layer 5A. The heat transfer tube layers 5A are arranged in a plurality of rows at predetermined intervals in the in-plane direction.

  When the insertion of the plurality of second vibration suppressing members 14B is completed, the holding members 16B are subsequently arranged between the holding members 16A. A joining member 15B provided at the other end of each second vibration suppressing member 14B is joined to each holding member 16B disposed between the holding members 16A (member joining step: step S12 in FIG. 11). . This completes the additional installation of the second vibration suppressing member 14B.

  As described above, according to the configuration of the first embodiment, the second vibration suppression member 14B is newly added in a staggered manner to the existing first vibration suppression member 14A, so that a plurality of heat transfer tubes 5 are provided on both sides. It can arrange | position so that the 2nd vibration suppression member 14B of this may be pressed. At this time, since the plurality of second vibration suppressing members 14B are at different positions in the axial direction of the heat transfer tube 5, the heat transfer tubes 5 can be alternately pressed along the axial direction. For this reason, the second vibration suppressing member 14B can suitably suppress the vibration of each heat transfer tube 5. Therefore, the steam generator 1 can reduce wear at the contact portion between the heat transfer tube 5 and the vibration suppressing member 14.

  Further, according to the configuration of the first embodiment, the second vibration suppressing member 14B can be formed wider than the first vibration suppressing member 14A. For this reason, when the first vibration suppression member 14A and the second vibration suppression member 14B are disposed in the gap between the heat transfer tubes 5, the second vibration suppression member 14B has a gap as compared to the first vibration suppression member 14A. It is possible to push the heat transfer tube 5 more than the first vibration suppressing member 14A. For this reason, since the heat transfer tube 5 can be positively pressed by the newly added second vibration suppressing member 14B, vibration of each heat transfer tube 5 can be suitably suppressed.

  Moreover, according to the structure of Example 1, since the 2nd vibration suppression member 14B can be formed in a cross-sectional rectangle shape, a contact part with the heat exchanger tube 5 can be made into line contact. For this reason, the contact part of the heat exchanger tube 5 and the 2nd vibration suppression member 14B can be enlarged, and the load of the press with respect to the heat transfer tube 5 of the 2nd vibration suppression member 14B can be disperse | distributed.

  Next, with reference to FIG. 7, the steam generator 80 which concerns on Example 2 is demonstrated. In the second embodiment, only parts different from the first embodiment will be referred to in order to avoid the description overlapping with the first embodiment. FIG. 7 is a plan view of a part of the heat transfer tube group of the steam generator according to the second embodiment as viewed from above. In the steam generator 1 of the first embodiment, the second vibration suppressing member 14B is formed in a rectangular cross section, but in the steam generator 80 of the second embodiment, the second vibration suppressing member 81 is formed in a circular cross section. . Hereinafter, with reference to FIG. 7, the steam generator 80 of Example 2 is demonstrated.

  In the steam generator 80 according to the second embodiment, the second vibration suppressing member 81 is a cylindrical rod having a circular cross section. That is, the second vibration suppression member 81 has a circular cross section cut by a plane orthogonal to the insertion direction inserted into the gap. Further, the second vibration suppressing member 81 is formed such that its diameter is longer than the length in the width direction (out-of-plane direction) of the first vibration suppressing member 14A. Here, since each heat transfer tube 5 is a round tube, the second vibration suppressing member 81 and the heat transfer tube 5 are in point contact. For this reason, if the 2nd vibration suppression member 81 is inserted in the clearance gap between 5 A of heat exchanger tube layers, the 2nd vibration suppression member 81 will be inserted, making point contact with each heat exchanger tube 5. FIG.

  As described above, according to the configuration of the second embodiment, since the second vibration suppressing member 81 can be formed in a circular cross section, the contact portion with the heat transfer tube 5 can be made point contact. For this reason, in the steam generator 80, since the contact part of the heat exchanger tube 5 and the 2nd vibration suppression member 81 can be made small, since frictional resistance can be made small, it is easy to insert the 2nd vibration suppression member 81. Can do.

  Next, with reference to FIG. 8, the steam generator 90 which concerns on Example 3 is demonstrated. In the third embodiment, only parts different from the first embodiment will be referred to in order to avoid the description overlapping with the first embodiment. FIG. 8 is a plan view of a part of the heat transfer tube group of the steam generator according to the third embodiment as viewed from above. In the steam generator 1 of the first embodiment, one second vibration suppression member 14B is disposed in each region S in the gap of the heat transfer tube layer 5A. However, in the steam generator 90 of the third embodiment, the second vibration suppression member A plurality of 14Bs are arranged in each region S. Hereinafter, with reference to FIG. 8, the steam generator 90 of Example 3 is demonstrated.

  In the steam generator 90 according to the third embodiment, the second vibration suppression member 14B is configured to suppress the second vibration with respect to the plurality of regions S arranged in a lattice shape partitioned by the end portions of the plurality of first vibration suppression members 14A. The region S in which the member 14B is inserted and the region S in which the second vibration suppressing member 14B is not inserted are inserted in a staggered manner so as to alternate along the in-plane direction and the out-of-plane direction. At this time, two second vibration suppression members 14B are inserted into each region S, and the two second vibration suppression members 14B are provided side by side in the axial direction (in-plane direction) of the heat transfer tube 5, and two The second vibration suppression members 14B are provided close to the end portions of the two first vibration suppression members 14A on the outer side in the in-plane direction.

  As described above, according to the configuration of the third embodiment, even if each region S defined by the end portion of the first vibration suppression member 14A is long in the in-plane direction, the two second vibration suppression members 14B. Can appropriately press each heat transfer tube 5 in the out-of-plane direction on both sides in the in-plane direction of each region S. For this reason, the second vibration suppressing member 14B can suitably suppress the vibration of each heat transfer tube 5. Therefore, the steam generator 90 can reduce wear at the contact portion between the heat transfer tube 5 and the vibration suppressing member 14.

  Next, with reference to FIG. 9, the steam generator 100 which concerns on Example 4 is demonstrated. In the fourth embodiment, only parts different from the first embodiment will be referred to in order to avoid overlapping with the first embodiment. FIG. 9 is a three-side view of the second vibration suppressing member disposed in the heat transfer tube group of the steam generator according to the fourth embodiment. In the steam generator 1 of the first embodiment, the second vibration suppression member 14B having a rectangular shape with a rectangular cross section is disposed. However, in the steam generator 100 of the fourth embodiment, the second vibration suppression member having a tapered shape is provided. 101 is arranged. Hereinafter, with reference to FIG. 9, the steam generator 100 of Example 4 is demonstrated.

  In the steam generator 100 of the fourth embodiment, as shown in FIG. 9, the second vibration suppressing member 101 has a length in the in-plane direction from the other end side (rear end side) to one end side (front end side). Are formed in a linear shape having the same length. On the other hand, the second vibration suppression member 101 is formed in a tapered shape that tapers from the other end side toward the one end side in the width direction (out-of-plane direction). That is, as for the 2nd vibration suppression member 101, both the side surfaces in an out-of-plane direction become the taper surface 101a, and the taper surface 101a is an inclined surface which goes inside toward the one end side from the other end side. In the second vibration suppression member 101, the length of one end portion formed in a thin direction in the out-of-plane direction is shorter (thinner) than the length in the out-of-plane direction of the first vibration suppression member 14A. On the other hand, in the second vibration suppression member 101, the length in the out-of-plane direction of the other end formed thick is longer (thicker) than the length in the out-of-plane direction of the first vibration suppression member 14A. Yes.

  As described above, according to the configuration of the fourth embodiment, the second vibration suppressing member 101 can be formed in a tapered shape that tapers from the other end side toward the one end side. For this reason, when inserting the 2nd vibration suppression member 101 in the clearance gap between 5 A of heat exchanger tube layers, since the one end part of the 2nd vibration suppression member 101 is thin, the one end part of the 2nd vibration suppression member 101 is made into a heat exchanger tube. It can be easily inserted into the gap of the layer 5A. And by inserting the 2nd vibration suppression member 101 further, since the other end part of the 2nd vibration suppression member 101 can be located in the clearance gap between 5 A of heat exchanger tube layers, the other end part of the 2nd vibration suppression member 101 Thus, the heat transfer tube 5 can be suitably pressed. The second vibration suppressing member 101 may be formed in a tapered shape that tapers from the other end side toward the one end side in the in-plane direction (direction orthogonal to the width direction).

  Next, with reference to FIG. 10, the steam generator 110 which concerns on Example 5 is demonstrated. In the fifth embodiment, only parts different from the first embodiment are referred to in order to avoid the description overlapping with the first embodiment. FIG. 10 is a plan view of a part of the heat transfer tube group of the steam generator according to the fifth embodiment as viewed from above. In the steam generator 1 according to the first embodiment, the second vibration suppression member 14B is newly added to the existing steam generator 1 to arrange the second vibration suppression member 14B in a staggered manner. In the steam generator 110, the vibration suppressing members 111 are arranged in a staggered manner when the steam generator 110 is assembled. Hereinafter, with reference to FIG. 10, the steam generator 110 of Example 5 is demonstrated.

  In the steam generator 110 according to the fifth embodiment, the plurality of vibration suppressing members 111 are respectively inserted into the gaps between the heat transfer tube layers 5A adjacent in the out-of-plane direction, as shown in FIG. The plurality of vibration suppressing members 111 are provided with a plurality of first vibration suppressing members 111A in one of the two gaps formed on both sides of the predetermined heat transfer tube layer 5A in the out-of-plane direction. A plurality of second vibration suppression members 111B are provided in the gap.

  In the first embodiment, the second vibration suppression member 14B is formed wider than the first vibration suppression member 14A. However, in the fifth embodiment, the second vibration suppression member 111B and the first vibration suppression member 111A are formed. Are the same width.

  The plurality of first vibration suppressing members 111A have the same configuration as the first vibration suppressing member 14A of the first embodiment, and the first vibration suppressing member 14A as a pair of three sets has a radius of curvature in the heat transfer tube layer 5A. It is provided along the circumferential direction.

  The plurality of second vibration suppression members 111B have the same configuration as the second vibration suppression member 14B of the first embodiment, and the eleventh second vibration suppression members 111B form a pair of first vibration suppression members. Three are provided for each 111A, and two are provided between three pairs of first vibration suppressing members 111A. At this time, in Example 1, five eleven second vibration suppression members 14B were provided in one of two gaps formed on both sides of the predetermined heat transfer tube layer 5A in the out-of-plane direction, and six in the other. However, in Example 5, the eleventh second vibration suppressing member 111B is provided in the other gap of the heat transfer tube layer 5A.

  And the clearance gap in which the some 1st vibration suppression member 111A was provided, and the clearance gap in which the several 2nd vibration suppression member 111B was provided are alternated in the out-of-plane direction of the heat exchanger tube layer 5A. For this reason, as shown in FIG. 10, the plurality of first vibration suppression members 111 </ b> A and the plurality of second vibration suppression members 111 </ b> B are provided on both sides of each heat transfer tube 5, and extend along the axial direction of the heat transfer tube 5. Are alternately arranged at predetermined intervals. In other words, the plurality of vibration suppression members 111 provided on both sides of each heat transfer tube 5 are provided at different positions in the axial direction of the heat transfer tube 5. That is, the plurality of vibration suppressing members 111 are arranged in a staggered manner.

  As described above, according to the configuration of the fifth embodiment, when the steam generator 110 is assembled, the plurality of vibration suppression members 111 are arranged in a staggered manner, so that the plurality of vibration suppression members are provided on both sides of each heat transfer tube 5. 111 can be arranged to press. At this time, since the plurality of vibration suppressing members 111 are at different positions in the axial direction of the heat transfer tubes 5, the heat transfer tubes 5 can be alternately pressed along the axial direction. For this reason, the plurality of vibration suppressing members 111 can suitably suppress the vibration of each heat transfer tube 5. Therefore, the steam generator 110 can reduce wear at the contact portion between the heat transfer tube 5 and the vibration suppressing member 111.

  In the first to fifth embodiments, the plurality of second vibration suppressing members 14B, 81, 101 or the plurality of vibration suppressing members 111 are arranged in a staggered manner. The heat transfer tubes 5 may be provided on both sides in the radial direction and at different positions in the axial direction of the heat transfer tubes 5.

DESCRIPTION OF SYMBOLS 1 Steam generator 2 Body 3 Tube group outer cylinder 4 Tube plate 5 Heat transfer tube 5A Heat transfer tube layer 6 Tube support plate 7 Water chamber 8 Bulkhead 9 Air-water separator 10 Moisture separator 11 Water supply pipe 12 Steam exhaust port 14 Vibration Suppression member 14A First vibration suppression member 14B Second vibration suppression member 15A Joining member 15B Joining member 16A Holding member 16B Holding member 17 Mounting member 51 Heat transfer tube group 71 Entrance chamber 72 Exit chamber 74 Inlet nozzle 75 Outlet nozzle 80 Steam generator (implementation) Example 2)
81 Second vibration suppressing member (Example 2)
90 Steam generator (Example 3)
100 Steam generator (Example 4)
101 Second vibration suppressing member (Example 4)
110 Steam generator (Example 5)
111 Vibration suppression member (Example 5)
111A 1st vibration suppression member (Example 5)
111B 2nd vibration suppression member (Example 5)
S area

Claims (8)

A plurality of heat transfer tubes provided side by side with a predetermined gap;
Provided in the gap, and at least a pair of vibration suppressing members provided on both sides across the heat transfer tubes,
The pair of vibration suppressing members are provided at a position where one of the vibration suppressing members and the other vibration suppressing member are different in the axial direction of the heat transfer tube,
One vibration suppression member is provided by pressing the heat transfer tube,
The other vibration suppression member is provided by pressing the heat transfer tube from the side opposite to the one vibration suppression member. A plurality of the vibration suppression members are provided in the gap,
The plurality of vibration suppression members include a plurality of existing first vibration suppression members and a plurality of second vibration suppression members newly installed,
2. The heat exchanger according to claim 1, wherein the second vibration suppressing members provided on both sides of the heat transfer tubes are provided at different positions in the axial direction of the heat transfer tubes.   3. The heat exchange according to claim 2, wherein the second vibration suppression member has a length in a width direction that is a direction in which the adjacent heat transfer tubes face each other, as compared with the first vibration suppression member. vessel.   The heat exchanger according to claim 2 or 3, wherein a plurality of the second vibration suppressing members are provided between the first vibration suppressing members adjacent in the axial direction of the heat transfer tube.   The cross section cut by the surface orthogonal to the insertion direction inserted in the said clearance gap is formed in the said 2nd vibration suppression member in the rectangular shape, The any one of Claim 2 to 4 characterized by the above-mentioned. Heat exchanger.   The cross section cut by the surface orthogonal to the insertion direction in which the second vibration suppressing member is inserted into the gap is formed in a circular shape. Heat exchanger.   The said 2nd vibration suppression member is formed in the taper shape tapering off toward the front end side from the rear end side of the insertion direction inserted in the said clearance gap, The any one of Claim 2 to 6 characterized by the above-mentioned. The heat exchanger according to item. A second vibration suppression member is newly added to an existing heat exchanger that includes a plurality of heat transfer tubes provided side by side with a predetermined gap and a plurality of first vibration suppression members provided in the gap. A method of additionally installing a vibration suppressing member,
The plurality of first vibration suppression members are provided on both sides of each heat transfer tube, and are provided at the same position in the axial direction of each heat transfer tube,
The plurality of second vibration suppression members are provided on both sides of the heat transfer tubes, are provided between the first vibration suppression members adjacent in the axial direction of the heat transfer tubes, and each of the heat transfer tubes A method for additionally installing a vibration suppressing member, wherein the vibration suppressing member is provided at a different position in the axial direction.

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