Vibration suppression device of heat transfer tube and steam generator

Abstract

There is provided a vibration suppression device of a heat transfer tube including: a cord member that has flexibility and is disposed in a heat transfer tube; and a plurality of sleeves that are mounted outside the cord member with a predetermined first gap and are disposed on an inner face of the heat transfer tube with a predetermined second gap.

1 . A vibration suppression device of a heat transfer tube comprising:
 a cord member that has flexibility and is disposed in a heat transfer tube; and   a plurality of sleeves that are mounted outside the cord member with a predetermined first gap and are disposed on an inner face of the heat transfer tube with a predetermined second gap.   
     
     
         2 . The vibration suppression device of a heat transfer tube according to  claim 1 , wherein the sleeve has a spherical outer face. 
     
     
         3 . The vibration suppression device of a heat transfer tube according to  claim 1 , wherein the sleeve has a first sleeve and a second sleeve with different outer diameters. 
     
     
         4 . The vibration suppression device of a heat transfer tube according to  claim 3 , wherein the first sleeve has a spherical outer face, the second sleeve has a circular outer face, and the outer diameter of the first sleeve is set larger than the outer diameter of the second sleeve. 
     
     
         5 . The vibration suppression device of a heat transfer tube according to  claim 4 , wherein the second sleeve is disposed between the plurality of first sleeves. 
     
     
         6 . The vibration suppression device of a heat transfer tube according to  claim 1 , wherein the plurality of sleeves are mounted movably in a longitudinal direction of the cord member with respect to the cord member and in a radial direction of the cord member. 
     
     
         7 . The vibration suppression device of a heat transfer tube according to  claim 6 , wherein a pair of positioning members are fixed to the cord member with a predetermined gap, and the sleeve is movably disposed between the pair of positioning members. 
     
     
         8 . The vibration suppression device of a heat transfer tube according to  claim 7 , wherein a predetermined third gap is provided between the positioning member and the sleeve or between the plurality of sleeves. 
     
     
         9 . The vibration suppression device of a heat transfer tube according to  claim 7 , wherein a biasing member is interposed between the positioning member and the sleeve or between the plurality of sleeves. 
     
     
         10 . The vibration suppression device of a heat transfer tube according to  claim 1 , wherein the plurality of sleeves include an inner sleeve that is mounted outside the cord member with the first gap, and an outer sleeve that is mounted outside the inner sleeve with a predetermined fourth gap and is disposed on an inner face of the heat transfer tube with the second gap. 
     
     
         11 . The vibration suppression device of a heat transfer tube according to  claim 1 , wherein the cord member has a leading end portion that is connected to a towing portion and a trailing end portion that is connectable to a closure member closing an end portion of the heat transfer tube. 
     
     
         12 . The vibration suppression device of a heat transfer tube according to  claim 1 , wherein the heat transfer tube has a U-shape portion, and the plurality of sleeves are disposed at the U-shape portion. 
     
     
         13 . A steam generator, which is provided with the vibration suppression device of the heat transfer tube according to  claim 1 , comprising:
 a body portion that has a hollow airtight shape;   a heat transfer tube group that is provided to form a reverse U-shape in the body portion and is formed of a plurality of heat transfer tubes in which first cooling water flows;   a tube plate that is fixed to a lower portion in the body portion and supports end portions of the plurality of heat transfer tubes;   an inlet side channel head and an outlet side channel head that are provided at a lower end portion of the body portion and communicate with each end portion of the plurality of heat transfer tubes;   a water supply portion that supplies secondary cooling water into the body portion; and   a steam outlet that is provided at an upper end portion of the body portion.