VIBRATION DAMPING STRUCTURE FOR HEAT-TRANSFER TUBE BUNDLE

• US 20190309940A1
• Filed: 07/21/2017
• Published: 10/10/2019
• Est. Priority Date: 11/21/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Katayama, Masaaki, Monde, Masatsugu, Hirota, Kazuo, Ono, Naoki
• Granted Patent: US 10,935,232 B2
• Time in Patent Office: Days
• CPC Class Codes: F16F 15/02 Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems F16F15/005 takes precedence ; layered products B32B; suppression of vibration in ships B63; relieving load on bearings, using magnetic means F16C39/06
• CPC Class Codes: F16F 15/073 using only leaf springs
• CPC Class Codes: F16F 2224/0208 Alloys
• CPC Class Codes: F16F 3/023 composed only of leaf springs
• CPC Class Codes: F22B 1/025 with vertical U shaped tubes carried on a horizontal tube sheet
• CPC Class Codes: F22B 37/206 Anti-vibration supports for the bends of U-tube steam generators
• CPC Class Codes: F28D 7/06 the conduits having a single U-bend F28D7/10 takes precedenceF28D7/0016 and F28D7/0033 take precedence
• CPC Class Codes: F28F 2265/30 for preventing vibrations
• CPC Class Codes: G21D 1/00 Details of nuclear power plant control G21D3/00
• CPC Class Codes: Y02E 30/00 Energy generation of nuclear origin
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

The preset application relates to 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.

Claims

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.

2. The vibration damping structure for a 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 a 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 a heat-transfer tube bundle according to claim 1,

wherein the first vibration damping member and the second vibration damping member are each composed of a plate member having a uniform thickness in the array direction.

5. The vibration damping structure for a 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 a 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.

8. The vibration damping structure for a heat-transfer tube bundle according to claim 7,

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.

9. The vibration damping structure for a 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.

10. The vibration damping structure for a 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.

11. The vibration damping structure for a 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.