JP6820566B2 - Metal-coated heat insulating structure of small pipe branch and its construction method - Google Patents

Description

The present invention relates to a metal-coated heat insulating structure of a small pipe branch portion and a method for constructing the same.

For example, a plurality of heat insulating objects such as pipes, steam generators, pressurizers, primary cooling pumps, and tanks in nuclear power generation equipment, experimental nuclear reactors, and other various nuclear equipment can be arranged along the outer peripheral surface. In addition, a metal-coated heat insulating device is used in which a box-shaped partially cylindrical metal casing having a curved surface along the outer peripheral surface is provided and a heat insulating material is housed in the partial cylindrical metal casing. Then, it has a sealing device located at a branching portion with a small tube branched from the heat insulating object and closing a through hole for insertion of the metal-coated heat insulating device formed around the small tube, and the sealing device is provided. The device includes a filler that fills the insertion through hole.

As the sealing device, for example, as shown in Patent Document 1, a heat insulating material 20 made of a metal foil is filled and covered with a metal cover plate 300 (see FIGS. 3 and 4A of the same publication). ..

By the way, the position of the small tube (second member 200) of the heat-insulated object greatly fluctuates due to thermal expansion exposed to high temperature and heat contraction when the operation is stopped. However, if the metal cover plate 300 is firmly attached to prevent the heat insulating material from falling off, it may be difficult to follow the position fluctuation of the small tube. Further, the heat insulating material 20 attaches the metal foil 24 to the attachment plate 26 along the longitudinal direction of the second member 200. Therefore, there is a concern that heat conduction in the longitudinal direction of the second member 200 is performed through the mounting plate 26, and the heat insulating property is impaired.

Japanese Unexamined Patent Publication No. 2016-84835

In view of such a conventional situation, the present invention provides a metal-coated heat insulating structure of a small tube branch portion capable of following a change in the position of a small tube due to thermal expansion and contraction and exhibiting sufficient heat insulating performance, and a method for constructing the same. The purpose is to provide.

In order to achieve the above object, the feature of the metal-coated heat insulating structure of the small tube branch portion according to the present invention is located at the branch portion between the metal-coated heat insulating device covering the heat insulating object and the small pipe branched from the heat insulating object. The sealing device has a sealing device for closing the insertion through hole of the metal-coated heat insulating device formed around the small tube, and the sealing device has a structure provided with a filler for filling the insertion through hole. The sealing device includes a lid that covers the filler and closes the insertion through hole, and the lid is divided into at least two parts and a small pipe notch for inserting the small pipe is formed in the divided portion. Further, it is attached to the metal-coated heat insulating device with a stopper, and the displacement in the direction perpendicular to the pipe length with respect to the direction orthogonal to the pipe length of the small tube due to thermal expansion and contraction of the heat insulating object as a main component. An easy deformation process for absorbing the small pipe is provided at the peripheral portion of the notch, or a movement allowance mechanism for absorbing the displacement in the longitudinal direction of the pipe is provided near the stopper.

According to the characteristics of the metal-coated heat insulating structure of the small tube branch portion, "to absorb the displacement in the direction orthogonal to the pipe length with respect to the direction orthogonal to the pipe length of the small tube due to thermal expansion and contraction mainly of the heat insulating object. Since the easy deformation processing is provided at the peripheral portion of the small pipe cut, the lid portion is not destroyed by the deformation of the easy deformation processing portion even if the small pipe is displaced in the longitudinal direction of the pipe. In addition, by "providing a movement allowance mechanism for absorbing the displacement in the longitudinal direction of the pipe in the vicinity of the stopper", even if the displacement of the small pipe in the orthogonal direction of the pipe length occurs, the lid is destroyed by the operation of the movement allowance mechanism. Will not be done. Therefore, the lid portion can be firmly attached to the metal-coated heat insulating device, and the risk of the filler falling off can be reduced.

It is assumed that the filler has a plurality of metal foils laminated in the tube axis direction of the small tube, and a part of the plurality of metal foils is formed unevenly to reduce the contact area between the metal foils. Good. Heat transfer in the longitudinal direction of the small tube is hindered, and excellent heat insulation performance is exhibited.

In addition, the metal foil may be formed by alternately stacking uneven foils having irregularities and flat foils. It is possible to prevent the possibility that the unevenness matches and the contact area between the foils increases, and the workability is improved.

On the other hand, the filler may be a metal bag in which a metal cotton body is wrapped with a metal cloth.

The easy deformation process can be easily provided by forming a small hole or a notch formed around the small tube notch.

The movement allowance mechanism provides a through hole provided in the front plate of the lid body or the metal heat insulating device that allows movement with the stopper, and a space between the stopper, the lid body, and the front plate. It is good to use it as an energizing tool.

The feature of the method of constructing the metal-coated heat insulating structure of the small tube branch portion according to any of the above features is that the metal-coated heat insulating device is installed in the vicinity of the small tube branch portion, and the small tube is inserted into the insertion through hole. Fillers provided with holes and slits connected to the holes are sequentially stacked with the directions of the slits being different between the stages, and the length of the small tube due to thermal expansion and contraction of the heat insulating object as the main component. The lid divided into two parts provided with an easy deformation process for absorbing the displacement in the direction perpendicular to the length of the pipe in the direction orthogonal to the hand is provided on the peripheral portion of the small pipe cut, and the small pipe cuts face each other to form the small pipe. It is to be attached to the front plate of the metal-coated heat insulating device in a state of being close to each other.

By the same method, it is possible to easily construct a metal-coated heat insulating structure in which easy deformation processing is provided at the peripheral portion of the small pipe cut.

Further, another feature of the method of constructing the metal-coated heat insulating structure of the small tube branch portion according to any one of the above features is that the metal-coated heat insulating device is installed in the vicinity of the small tube branch portion, and the through hole for insertion is formed. The lid or the lid that allows the filling material provided with the insertion hole of the small tube and the slit connected to the small tube to be sequentially stacked with the directions of the slits being different between the stages to allow movement with the stopper. A state in which the stopper is interposed in a through hole provided in the front plate of the metal heat insulating device, and the lid body divided into two is brought close to the small tube with the small tube cuts facing each other. It is to be attached to the front plate of the metal-coated heat insulating device.

By this method, a metal-coated heat insulating structure provided with a movement allowance mechanism can be easily constructed.

According to the characteristics of the metal-coated heat insulating structure of the small tube branch portion and the construction method thereof according to the present invention, it is possible to follow the position change of the small tube due to thermal expansion and contraction, and to exhibit sufficient heat insulating performance. It was.
Other objects, configurations and effects of the present invention will be apparent from the sections of embodiments of the invention below.

It is sectional drawing of the metal-coated heat insulating structure which concerns on this invention (the sectional view taken along line AA of FIG. 2). It is a top view of FIG. It is an exploded perspective view of FIG. It is an enlarged plan view of FIG. FIG. 5 is a cross-sectional view of a metal-coated heat insulating structure according to a second embodiment of the present invention (cross-sectional view taken along line BB in FIG. 6). FIG. 5 is a plan view of FIG. It is sectional drawing (the CC line sectional drawing of FIG. 8) of the metal-coated heat insulating structure which concerns on 3rd Embodiment of this invention. FIG. 7 is a plan view of FIG. FIG. 7 is a partially exploded perspective view of FIG. 7. It is sectional drawing of a metal bag. It is a top view of the metal-coated heat insulating structure which concerns on 4th Embodiment of this invention. It is an exploded perspective view of the metal-coated heat insulating structure which concerns on 5th Embodiment of this invention. It is an exploded perspective view which shows the 6th Embodiment corresponding to FIG.

Next, the present invention will be described in more detail with reference to the accompanying drawings as appropriate.
As shown in FIGS. 1 to 4, the metal-coated heat insulating structure 1 of the small pipe branch portion 100 according to the present invention includes, for example, piping, a steam generator, a pressurizer, etc. in nuclear power generation equipment, an experimental nuclear reactor, and various other nuclear-related equipment. It is configured so that the heat insulating object 101 having a columnar outer peripheral surface such as a primary cooling pump and a cylindrical tank type pressure vessel can be heat-insulated and kept warm. Then, in order to allow the replacement work to be performed in a short time in order to minimize radiation exposure, a plurality of heat insulating objects 101 having a cylindrical outer peripheral surface can be arranged along the cylindrical outer peripheral surface. In addition, a metal-coated heat insulating device 2 having a box-shaped partially cylindrical metal casing (corresponding 21 to 23) having a curved surface along the outer peripheral surface thereof is hooked and attached with a buckle or the like.

The metal-coated heat insulating structure 1 of the small tube branch portion is located at the branch portion 100 with the small tube 102 branched from the heat insulating object 101, and has a through hole 5 for insertion of the metal-coated heat insulating device 2 formed around the small tube 102. It is composed of a sealing device 3 for closing and a metal-coated heat insulating device 2 mentioned above. The sealing device 3 includes a filler 30 and a lid 40 that covers the filler 30 and closes the through hole for insertion.

The metal-coated heat insulating device 2 is formed by filling a cavity formed by a front plate 21, a back plate 22 and a side plate constituting a metal casing and a wall plate 23 forming a through hole 5 for insertion with a heat insulating material 24. .. As the heat insulating material 24, a metal foil or a metal bag described later is used. Since the metal-coated heat insulating device 2 and the sealing device 3 constituting the metal-coated heat insulating structure 1 are exposed to a considerably high temperature, a metal material having oxidation durability such as stainless steel is used for these.

As shown in FIG. 3, the pipe longitudinal orthogonal direction D is a direction orthogonal to the longitudinal direction DL of the small tube 102. The direction of displacement of the small pipe 102 generated by heat expansion and contraction of a large-diameter pipe, a container, etc., which is mainly a heat insulating object 101, is shown. Both codes Dx and Dy are included, but they may be in only one direction instead of two-dimensional.

As the filler 30 in the present embodiment, a concave-convex foil 31 having an upper convex portion 31a and a lower convex portion 31b and a flat foil 32 are alternately stacked. The concave-convex foil 31 and the flat foil 32 are divided into two in each stacking stage, and the small tubes 102 above are provided on the inner end faces 31y and 32y (the spaces between the inner end faces correspond to the slits 31z and 32z of the embodiment described later) facing each other. A notch 31x and a notch 32x (the holes formed by arranging the notches correspond to the insertion holes of the small pipes of the examples described later) are formed for insertion. The uneven foils 31 and the flat foils 32 may be stacked in the same direction, but by stacking them in different directions as shown in the sign 32', the inner end surfaces 31y and the inner end surfaces 32y facing each other can communicate with each other up and down. It is possible to block the flow of air through the inner end faces and improve the heat insulation efficiency.

The lid 40 is divided into 40A and 40B, and a small tube notch 41 for inserting the small tube 102 is formed in the divided portion. A rivet 51, which is a stopper 50, is passed through a small hole 43a as a stopper hole 43 provided at the four corners of the divided bodies 40A and 40B and a pilot hole 25 provided on the front plate 21, and the lid 40 is made of metal. It is attached to the covering heat insulating device 2. By using a blind rivet for the rivet 51, quick attachment work becomes possible.

An easily deformable processing portion 42 is provided around the small tube notch 41. The easily deformable processing portion 42 forms a large number of small and long holes 42a for easy deformation processing. As a result, while the filling body 30 is securely held by the lid 40 and the stopper 50, the pipe length orthogonal direction displacement with respect to the direction orthogonal to the pipe length of the small tube 102 due to thermal expansion and contraction of the heat insulating object 101 and the small tube 102. D is deformed by the easily deformable processing unit 42 so that it can be absorbed.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In addition, in the following other embodiments, the same symbols are attached to the same members as those in the first embodiment.

The difference in the present embodiment is that the movement allowance mechanism 57 is provided instead of the easily deformed processing portion 42. The movement allowance mechanism 57 includes a screw member 52 as a stopper 50 and a long hole 43b as a stopper hole 43. The screw member 52 includes a pair of nuts 52b and a pair of washers 53 screwed to both ends of the screw 52a. The washer 53 is formed of a spring member and acts as an urging tool to temporarily fix the divided bodies 40A and 40B to the positions shown in FIG. The displacement D in the direction orthogonal to the pipe length with respect to the direction orthogonal to the pipe length of the small pipe 102 due to thermal expansion and contraction of the heat insulating object 101 and the small pipe 102 can be absorbed by sliding using the elongated hole 43b of the movement allowance mechanism 57. Further, the inner end surfaces 45 and 45 of the divided bodies 40A and 40B are overlapped with each other by the overlapping portion 45x so that the inner end surface 45 portion due to the operation of the movement allowance mechanism 57 is not released.

Next, a third embodiment of the present invention will be described with reference to FIGS. 7 to 10. The present embodiment is different in that the slip of the movement allowance mechanism 57 is generated in the large round hole 43c as the stop hole 43 and that the metal bag is used as the filler 30.

In the present embodiment, the tap screw 54 is used as the stopper 50, and the washer 55 is used as the urging tool. Since the tap screw 54, the prepared hole 25 is formed when the screw is used, and quick mounting work is possible.

In the present embodiment, the insertion through hole 5 exhibits a rectangular parallelepiped, and the lid 40 is rectangular in a sealed state. The lid 40 may be formed in accordance with the insertion through hole 5, and may be formed so that the outer shape is circular or elliptical in the sealed state, for example.

The metal bag 35 is made by wrapping a metal cotton 35b with a metal cloth 35a and sewing the periphery with a metal thread 35c. In the present embodiment, the metal bag 35 has a shape in which the cut portion 35e is continuous with the hole portion 35d, and is installed so that the hole portion 35d is wound around the small tube 102. Elongated bags may be packed in the same way.

In the fourth embodiment of the present invention shown in FIG. 11, the easily deformable processing portion 42 is formed as a small round hole 42b. Further, in the fifth embodiment of the present invention shown in FIG. 12, the small tube notch 41 is deepened to increase the overlapping portion of the two divided bodies 40A and 40B.

At the time of construction, the small tube 102 is passed through the through hole 5 for insertion, and the metal-coated heat insulating device 2 is attached to the heat insulating object 101. Then, the filler 30 is sequentially stacked between the small tube 102 and the insertion through hole 5. At this time, the filler 30 is composed of a plurality of elements stacked one above the other, and each element is divided into two at each stacking stage, and the direction of the two divisions may be different between the respective stages (FIG. 3). Signs 32, 32', signs 35x, 35y, etc. in FIG. 9). Then, it is preferable to arrange the divided bodies 40A and 40B and quickly attach the lid body 40 to the rivet 51, the tap screw 54, or the like.

In the sixth embodiment shown in FIG. 13, the concave-convex foil 31 and the flat foil 32 are not divided into two but integrated, and are alternately stacked. The concave-convex foil 31 and the flat foil 32 form an insertion hole for inserting the small tube 102 by abutting a pair of cuts 31x and 32x in each stacking stage, and have slits 31z and 32z leading to the insertion hole. In mounting, the concave-convex foil 31 and the flat foil 32 may be twisted so as to open the slits 31z and 32z, respectively, and the small tube 102 may be inserted into the insertion hole.

In the above embodiment, the range of easy deformation processing of the easy deformation processing portion 42, the type of stop hole 43 (long hole 43b, large round hole 43c), etc. are accompanied by thermal expansion and contraction of the heat insulating object 101 and the small tube 102. It may be designed according to the "direction" of the displacement D in the direction orthogonal to the pipe length with respect to the direction orthogonal to the pipe length of the small pipe 102. When the direction of displacement is limited, easy deformation processing may be performed only on the elongated hole 43b closed in that direction or in that direction.

Each embodiment of the present invention may be implemented in combination with each other, and may be appropriately modified without departing from the spirit of the invention.

The present invention relates to a small tube for a heat insulating object having a columnar outer peripheral surface such as a pipe, a steam generator, a pressurizer, a primary cooling pump, and a tank in, for example, nuclear power generation equipment, an experimental nuclear reactor, and various other nuclear-related equipment. It can be used as a metal-coated heat insulating structure for a branched small pipe branch and a method for constructing the same.

1: Metal-coated heat insulating structure 2: Metal-coated heat insulating device 3: Sealing device 5: Through hole for insertion, 21: Front plate, 22: Back plate, 23: Wall plate, 24: Insulation material, 25: Bottom Hole, 30: Filler, 31: Concavo-convex foil, 31a: Upper convex part, 31b: Lower convex part, 31x: Cut, 31y: Inner end surface, 31z: Slit, 32: Flat foil, 32x: Cut, 32y: Inner end surface, 32z: Slit, 35: Metal bag, 35a: Metal cloth, 35b: Metal cotton, 35c: Metal thread, 35d: Hole, 35e: Cut, 40: Lid, 40A: First split body, 40B: 2nd split body, 41: Small pipe cut, 42: Easy deformation processing part (easy deformation processing), 42a: Small elongated hole, 42b: Small round hole, 43: Stop hole, 43a: Small hole, 43b: Long hole, 43c : Large round hole, 45: Inner end surface, 45x: Overlapping part, 50: Stopper, 51: Rivet, 52: Screw member, 52a: Screw, 52b: Nut, 53: Washer, 54: Tap screw, 55: Washer, 57: Movement allowance mechanism, 100: small pipe branch, 101: heat insulating object, 102: small pipe, D (Dx, Dy): pipe longitudinal orthogonal direction, DL: longitudinal direction (tube longitudinal)

Claims (8)

A seal located at a branch portion between a metal-coated heat insulating device that covers the heat insulating object and a small tube branched from the heat insulating object, and closes an insertion through hole of the metal-coated heat insulating device formed around the small tube. The sealing device has a metal-coated heat insulating structure of a small tube branch portion provided with a filler for filling the insertion through hole.
The sealing device includes a lid that covers the filler and closes the insertion through hole.
The lid is divided into at least two parts, and a small tube notch for inserting the small tube is formed in the divided portion, and is further attached to the metal-coated heat insulating device with a stopper.
An easy deformation process for absorbing the displacement in the direction orthogonal to the pipe length of the small pipe due to thermal expansion and contraction mainly of the heat insulating object is provided on the peripheral portion of the small pipe cut, or A metal-coated heat insulating structure of a small pipe branch portion provided with a movement allowance mechanism for absorbing the displacement in the longitudinal direction of the pipe near the stopper. The filler has a plurality of metal foils laminated in the tube axis direction of the small tube, and a part of the plurality of metal foils is formed unevenly to reduce the contact area between the metal foils. The metal-coated heat insulating structure of a small tube branch according to claim 1. The metal-coated heat insulating structure of a small tube branch according to claim 2, wherein the metal foil is formed by alternately stacking uneven foils having irregularities and flat foils. The metal-coated heat insulating structure of a small tube branch according to claim 1, wherein the filler is a metal bag in which a metal cotton body is wrapped with a metal cloth. The metal-coated heat insulating structure of a small tube branch portion according to any one of claims 1 to 4, wherein the easily deformable processing is a small hole or a notch formed around the small tube cut. The movement allowance mechanism provides a through hole provided in the front plate of the lid body or the metal heat insulating device that allows movement with the stopper, and a space between the stopper, the lid body, and the front plate. The metal-coated heat insulating structure of a small tube branch according to any one of claims 1 to 4, which is a urging tool. The method for constructing a metal-coated heat insulating structure for a small tube branch according to any one of claims 1 to 6, wherein the metal-coated heat insulating device is installed in the vicinity of the small tube branch, and the insertion through hole is used. Fillers provided with an insertion hole for a small tube and a slit connected to the small tube are sequentially stacked with different directions of the slits between the stages, and the heat insulating object is mainly used for thermal expansion and contraction. The two-divided lid body provided with an easy deformation process for absorbing the displacement in the direction orthogonal to the pipe length of the small pipe in the direction orthogonal to the pipe length is provided at the peripheral portion of the small pipe cut so that the small pipe cuts face each other. A method for constructing a metal-coated heat insulating structure of a small pipe branch portion to be attached to the front plate of the metal-coated heat insulating device in a state of being close to the small pipe. The method for constructing a metal-coated heat insulating structure for a small tube branch according to any one of claims 1 to 6, wherein the metal-coated heat insulating device is installed in the vicinity of the small tube branch, and the insertion through hole is used. The lid or the lid that allows the filler to be provided with the insertion hole of the small tube and the slit connected to the small tube to be sequentially stacked with the directions of the slits being different between the stages to allow movement with the stopper. The stopper is interposed in the through hole provided in the front plate of the metal heat insulating device, and the lid body divided into two is brought close to the small tube with the small tube cuts facing each other. A method for constructing a metal-coated heat insulating structure at a branch of a small pipe to be attached to the front plate of the metal-coated heat insulating device.

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