Heat exchanger tube vibration suppression device and steam generator

Abstract

A heat exchanger tube vibration suppression device and a steam generator are provided. The heat exchanger tube vibration suppression device includes: a plurality of sleeves disposed in a heat exchanger tube with a predetermined gap in relation to an inner surface of the heat exchanger tube so as to extend in a longitudinal direction of the heat exchanger tube; and a connecting member that connects the plurality of sleeves so as to be movable between a contracted position at which adjacent sleeves overlap at least partially and an extended position at which the amount of overlap of the adjacent sleeves is minimized. In this way, it is possible to suppress the vibration of the heat exchanger tube appropriately.

1 . A heat exchanger tube vibration suppression device comprising:
 a plurality of sleeves disposed in a heat exchanger tube with a predetermined gap in relation to an inner surface of the heat exchanger tube so as to extend in a longitudinal direction of the heat exchanger tube; and   a connecting member that connects the plurality of sleeves so as to be movable between a contracted position at which adjacent sleeves overlap at least partially and an extended position at which an amount of overlap of the adjacent sleeves is minimized.   
     
     
         2 . The heat exchanger tube vibration suppression device according to  claim 1 , wherein
 the connecting member includes a first locking portion provided on one side in the longitudinal direction of the sleeve and a second locking portion provided on the other side in the longitudinal direction of the sleeve, and the first locking portion and the second locking portion can be locked together.   
     
     
         3 . The heat exchanger tube vibration suppression device according to  claim 2 , wherein
 the first locking portion and the second locking portion can hold the plurality of sleeves at the contracted position and the extended position.   
     
     
         4 . The heat exchanger tube vibration suppression device according to  claim 3 , wherein
 the plurality of sleeves has the same shape and has a cylindrical shape in which a diameter on one side in the longitudinal direction is smaller than a diameter on the other side, the first locking portion is provided on an outer side and the second locking portion is provided on an inner side.   
     
     
         5 . The heat exchanger tube vibration suppression device according to  claim 3 , wherein
 the first locking portion and the second locking portion have a base end portion that is attached to the sleeve so as to freely fluctuate.   
     
     
         6 . The heat exchanger tube vibration suppression device according to  claim 2 , wherein
 the plurality of sleeves includes a large-diameter sleeve and a small-diameter sleeve which are alternately arranged along the longitudinal direction of the heat exchanger tube, the first locking portion and the second locking portion of the large-diameter sleeve are provided on an inner side, and the first locking portion and the second locking portion of the small-diameter sleeve are provided on an outer side.   
     
     
         7 . The heat exchanger tube vibration suppression device according to  claim 1 , wherein
 an attenuation ring is disposed on an outer side of the sleeve.   
     
     
         8 . The heat exchanger tube vibration suppression device according to  claim 7 , wherein
 a restricting portion that restricts the attenuation ring so as to be immovable over an entire length of the sleeve is provided.   
     
     
         9 . The heat exchanger tube vibration suppression device according to  claim 1 , wherein
 a cord-like member having flexibility is disposed on an inner side of the plurality of sleeves.   
     
     
         10 . The heat exchanger tube vibration suppression device according to  claim 9 , wherein
 a holding member that holds the plurality of sleeves at the contracted position is detachably attached to the cord-like member.   
     
     
         11 . A steam generator comprising:
 a body part having a hollow airtight shape;   a heat exchanger tube bundle including a plurality of heat exchanger tubes which is arranged in the body part so as to form a reverse U-shape and in which a primary cooling water flows;   a tube plate that is fixed to a lower portion of the body part so as to support an end portion of the plurality of heat exchanger tubes;   an inlet-side channel head and an outlet-side channel head that are provided in a lower end portion of the body part so as to communicate with the respective end portions of the plurality of heat exchanger tubes;   a water supply portion that supplies a secondary cooling water into the body part;   a steam outlet provided in an upper end portion of the body part; and   the heat exchanger tube vibration suppression device according to  claim 1 .   
     
     
         12 . A heat exchanger tube vibration suppression device comprising:
 a cord-like member having flexibility and disposed in a heat exchanger tube;   a plurality of sleeves having a hollow shape and disposed along a longitudinal direction of the cord-like member; and   a plurality of granular bodies that is movably filled in the sleeve.   
     
     
         13 . The heat exchanger tube vibration suppression device according to  claim 12 , wherein
 the sleeve has a hollow cylindrical shape and is disposed so that a predetermined gap is formed between an outer circumferential surface of the sleeve and an inner surface of the heat exchanger tube.   
     
     
         14 . The heat exchanger tube vibration suppression device according to  claim 12 , wherein
 the sleeve is fixed to the cord-like member with a predetermined gap in the longitudinal direction of the cord-like member.   
     
     
         15 . The heat exchanger tube vibration suppression device according to  claim 12 , wherein
 a pair of disc members is fixed to the cord-like member with a predetermined gap in a longitudinal direction of the cord-like member, and the plurality of sleeves is disposed between the pair of disc members so as to be movable along the longitudinal direction of the cord-like member.   
     
     
         16 . The heat exchanger tube vibration suppression device according to  claim 15 , wherein
 the gap between the sleeve and the heat exchanger tube is larger than the gap between the disc member and the heat exchanger tube.   
     
     
         17 . The heat exchanger tube vibration suppression device according to  claim 12 , wherein
 the heat exchanger tube is formed such that a U-shaped portion is connected to an upper end portion of a straight portion, and the plurality of sleeves is disposed in the U-shaped portion.   
     
     
         18 . The heat exchanger tube vibration suppression device according to  claim 17 , wherein
 a holding member that holds the cord-like member to be held at the straight portion so that the plurality of sleeves is positioned at a predetermined position of the heat exchanger tube is provided.   
     
     
         19 . The heat exchanger tube vibration suppression device according to  claim 17 , wherein
 the cord-like member has respective end portions in the longitudinal direction being held at the straight portion by a tension member.   
     
     
         20 . A steam generator comprising:
 a body part having a hollow airtight shape;   a heat exchanger tube bundle including a plurality of heat exchanger tubes which is arranged in the body part so as to form a reverse U-shape and in which a primary cooling water flows;   a tube plate that is fixed to a lower portion of the body part so as to support an end portion of the plurality of heat exchanger tubes;   an inlet-side channel head and an outlet-side channel head that are provided in a lower end portion of the body part so as to communicate with the respective end portions of the plurality of heat exchanger tubes;   a water supply portion that supplies a secondary cooling water into the body part;   a steam outlet provided in an upper end portion of the body part; and   the heat exchanger tube vibration suppression device according to  claim 12 .   
     
     
         21 . A heat exchanger tube vibration suppression device comprising:
 a cord-like member having flexibility and disposed in a heat exchanger tube; and   a moving device provided at least one end portion of the cord-like member so as to move the cord-like member toward a U-bend part when the cord-like member is disposed in the heat exchanger tube.   
     
     
         22 . The heat exchanger tube vibration suppression device according to  claim 21 , wherein
 the moving device has a fixing mechanism that fixes to an end portion of the heat exchanger tube.   
     
     
         23 . The heat exchanger tube vibration suppression device according to  claim 22 , wherein
 a plugging member that blocks the end portion of the heat exchanger tube is provided, the fixing mechanism is provided in the plugging member, and a push-up mechanism capable of moving the cord-like member is disposed between the end portion of the cord-like member and the plugging member.   
     
     
         24 . The heat exchanger tube vibration suppression device according to  claim 21 , wherein
 the cord-like member has a first cord portion having predetermined bending strength and a second cord portion provided on at least one end side in the longitudinal direction of the cord-like member and having higher bending strength than the first cord portion.   
     
     
         25 . The heat exchanger tube vibration suppression device according to  claim 24 , wherein
 the second cord portion is formed by connecting a plurality of connecting members in series.   
     
     
         26 . The heat exchanger tube vibration suppression device according to  claim 25 , wherein
 a rolling member is provided on an outer circumferential portion of the connecting member.   
     
     
         27 . The heat exchanger tube vibration suppression device according to  claim 25 , wherein
 a sleeve configured to make sliding contact with an inner circumferential surface of the heat exchanger tube is provided on an outer circumferential portion of the connecting member.   
     
     
         28 . The heat exchanger tube vibration suppression device according to  claim 24 , wherein
 an expanding member is disposed between the first cord portion and the second cord portion.   
     
     
         29 . The heat exchanger tube vibration suppression device according to  claim 24 , wherein
 a holding member that holds the second cord portion at a predetermined position of the heat exchanger tube is provided.   
     
     
         30 . A steam generator comprising:
 a body part having a hollow airtight shape;   a heat exchanger tube bundle including a plurality of heat exchanger tubes which is arranged in the body part so as to form a reverse U-shape and in which a primary cooling water flows;   a tube plate that is fixed to a lower portion of the body part so as to support an end portion of the plurality of heat exchanger tubes;   an inlet-side channel head and an outlet-side channel head that are provided in a lower end portion of the body part so as to communicate with the respective end portions of the plurality of heat exchanger tubes;   a water supply portion that supplies a secondary cooling water into the body part;   a steam outlet provided in an upper end portion of the body part; and   the heat exchanger tube vibration suppression device according to  claim 21 .   
     
     
         31 . A steam generator comprising:
 a body part having a hollow airtight shape;   a heat exchanger tube bundle including a plurality of heat exchanger tubes which is arranged in the body part so as to form a reverse U-shape and in which a primary cooling water flows;   a tube plate that is fixed to a lower portion of the body part so as to support an end portion of the plurality of heat exchanger tubes;   an inlet-side channel head and an outlet-side channel head that are provided in a lower end portion of the body part so as to communicate with the respective end portions of the plurality of heat exchanger tubes;   a water supply portion that supplies a secondary cooling water into the body part;   a steam outlet provided in an upper end portion of the body part; and   a vibration suppression device in which a cord-like member is disposed in a portion of the plurality of heat exchanger tubes and which is supported by being pushed up from a lower surface of a U-bend part of the heat exchanger tube.