Vibration damping structure for heat-transfer tube bundle

Patent metadata

Field	Value
Publication number	US-10935232-B2
Application number	US-201716309616-A
Country	US
Kind code	B2
Filing date	Jul 21, 2017
Priority date	Nov 21, 2016
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

A vibration damping structure for a heat-transfer tube bundle including columns arranged at an interval and each composed of a plurality of heat-transfer tubes curved in a common plane and arranged in parallel to each other. The vibration damping structure includes a first vibration damping member and a second vibration damping member disposed between the columns so as to intersect the array direction of the columns. The first vibration damping member and the second vibration damping member are disposed at different positions in an axial direction of each heat-transfer tube, and thicknesses of the first vibration damping member and the second vibration damping member in the array direction are larger than an average value of a clearance between the columns under operation.

First claim

The invention claimed is:

1. A vibration damping structure for a heat-transfer tube bundle including
columns each composed of a plurality of heat-transfer tubes curved in a common plane and arranged in parallel to each other, the columns being arranged at an interval, the vibration damping structure comprising:
at least one first vibration damping member disposed between a Nth column and a N+1th column so as to intersect an array direction of the columns, where N represents a natural number; and at least one second vibration damping member disposed between the N+1th column and a N+2th column so as to intersect the array direction,
wherein the first vibration damping member and the second vibration damping member are disposed at different positions in an axial direction of each heat-transfer tube, and thicknesses of the first vibration damping member and the second vibration damping member in the array direction are larger than an average value of a clearance between the columns under operation, wherein the plurality of the heat-transfer tubes are respectively arranged so that an arc portion is convex upward, and wherein the first vibration damping member and the second vibration damping member are alternately arranged along the array direction so that a bent portion which is curved in an opposite direction to the arc portion corresponds to the arc portion of the plurality of the heat-transfer tubes.

2. The vibration damping structure for the heat-transfer tube bundle according to claim 1 ,
wherein each heat-transfer tube has an uneven cross-section in a plane intersecting the first vibration damping member or the second vibration damping member, and wherein the first vibration damping member and the second vibration damping member abut on the heat-transfer tubes at a concave portion of the uneven cross-section.

3. The vibration damping structure for the heat-transfer tube bundle according to claim 1 ,
wherein the first vibration damping member and the second vibration damping member are curved in an opposite direction to the plurality of heat-transfer tubes, and the first vibration damping member and the second vibration damping member are formed so as to increase curvature with an increase in distance from a curvature center of the plurality of heat-transfer tubes.

4. The vibration damping structure for the heat-transfer tube bundle according to claim 1 ,
wherein the first vibration damping member and the second vibration damping member areeach composed of a plate member having a uniform thickness in the array direction.

5. The vibration damping structure for the heat-transfer tube bundle according to claim 1 , further comprising a third vibration damping member disposed between the Nth column and the N+1th column so as to face the second vibration damping member across the heat-transfer tubes.

6. The vibration damping structure for the heat-transfer tube bundle according to claim 5 , wherein the third vibration damping member is thinner in the array direction than the first vibration damping member.

7. A vibration damping structure for a heat-transfer tube bundle including columns each composed of a plurality of heat-transfer tubes curved in a common plane and arranged in parallel to each other, the columns being arranged at an interval, the vibration damping structure comprising:
at least one first vibration damping member disposed between a Nth column and a N+1th column so as to intersect an array direction of the columns, where N represents a natural number; and at least one second vibration damping member disposed between the N+1th column and a N+2th column so as to intersect the array direction,
wherein the first vibration damping member and the second vibration damping member are disposed at an identical position in an axial direction of each heat-transfer tube so as to face each other across the heat-transfer tubes, and the first vibration damping member and the second vibration damping member have different thicknesses in the array direction,
wherein the plurality of the heat-transfer tubes are respectively arranged so that an arc portion is convex upward, and wherein the first vibration damping member and the second vibration damping member are alternately arranged along the array direction so that a bent portion which is curved in an opposite direction to the arc portion corresponds to the arc portion of the plurality of the heat-transfer tubes.

8. The vibration damping structure for the heat-transfer tube bundle according to claim 7 , wherein the at least one first vibration damping member includes a first thick vibration damping member and a first thin vibration damping member thinner than the first thick vibration damping member, the first thick vibration damping member and the first thin vibration damping member being alternately arranged along the common plane, and
wherein the at least one second vibration damping member includes a second thin vibration damping member disposed to face the first thick vibration damping member across the heat-transfer tubes and a second thick vibration damping member disposed to face the first thin vibration damping member across the heat-transfer tubes.

9. The vibration damping structure for the heat-transfer tube bundle according to claim 7 , wherein each of the at least one first vibration damping member includes a first thick portion disposed in a first region and a first thin portion disposed in a second region adjacent to the first region along an axial direction of each heat-transfer tube, the first thin portion being thinner than the first thick portion, and
wherein each of the at least one second vibration damping member includes a second thin portion disposed to face the first thick portion across the heat-transfer tubes and a second thick portion disposed to face the first thin portion across the heat-transfer tubes.

10. The vibration damping structure for the heat-transfer tube bundle according to claim 7 , wherein the first vibration damping member and the second vibration damping member are curved in an opposite direction to the plurality of heat-transfer tubes, and the first vibration damping member and the second vibration damping member are formed so as to increase curvature with an increase in distance from a curvature center of the plurality of heat-transfer tubes.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Katayama Masaaki
• Monde Masatsugu
• Hirota Kazuo
• Ono Naoki

Classifications

• Y02E30/00

  Energy generation of nuclear origin · CPC title

• F28D7/06

  the conduits having a single U-bend (F28D7/10 takes precedence){(F28D7/0016 and F28D7/0033 take precedence)} · CPC title

• F16F2224/0208

  Alloys · CPC title

• G21D1/00

  Details of nuclear power plant (control G21D3/00) · CPC title

• F28F2265/30

  for preventing vibrations · CPC title