JP5948377B2 - Metal-coated insulation equipment - Google Patents

Description

  The present invention is, for example, for a heat insulation object having a cylindrical outer peripheral surface such as a pipe, a steam generator, a pressurizer, a primary cooling pump, a tank, etc. A box-shaped partial cylindrical metal casing having a curved surface along the columnar outer peripheral surface can be provided along the columnar outer peripheral surface, and heat insulation is provided in the partial cylindrical metal casing. In the partial cylindrical metal casing, a plurality of flat plates along the curved surface and a surface holding plate having surface irregularities are alternately stacked in the heat flow direction as the heat insulating material. The present invention relates to a metal-coated heat insulating device.

Conventionally, there is one in which the spacing plate is formed of a corrugated stainless steel foil (see, for example, Patent Document 1), but the corrugated crest is a length that extends over the entire length inside the partial cylindrical metal casing. Therefore, the contact area with the flat plate is large and the amount of heat conduction is large. For this reason, there has been a problem that the heat insulating property tends to be lowered.
Therefore, the spacing plate is an embossed plastic film having a large number of first large protrusions that protrude greatly outward in the radial direction and second large protrusions that protrude largely inward in the partial cylindrical metal casing ( For example, it is conceivable to apply the shape of Patent Document 2) to a metal-coated heat insulating device having heat resistance by applying it to the formation of a metal plate.

Japanese Utility Model Publication No. 7-41192 Japanese Examined Patent Publication No.59-8917

  In the metal-coated heat insulating device described above, the gaps between the outer and inner sides of the spacing plate and the adjacent flat plate are equally large, convection is likely to occur in each space, and the heat insulating performance is liable to deteriorate, Although the contact area with the flat plate is smaller than the corrugated shape, the top portions of the first large protrusion and the second large protrusion are flat, so the area in contact with the flat plate is large, and the heat conduction is also large. There was a drawback that the amount of heat flowed out

  Accordingly, an object of the present invention is to provide a metal-coated heat insulating device that solves the above-described problems and further improves heat insulation by reducing heat conduction.

A first characteristic configuration of the present invention is a heat insulating object having a cylindrical outer peripheral surface, a plurality of which can be disposed along the cylindrical outer peripheral surface, and a curved surface along the cylindrical outer peripheral surface. Provided with a box-shaped partial cylindrical metal casing, containing a heat insulating material in the partial cylindrical metal casing,
As the heat insulating material, a metal-coated heat insulating device in which a plurality of flat plates along the curved surface and uneven surface-preserving spacing plates in the partial cylindrical metal casing are alternately stacked in the heat flow direction. The flat plate and the interval holding plate are formed of a metal plate, and a large number of large protrusions are provided in a staggered arrangement that protrude greatly on either the outer side surface or the inner side surface of the interval holding plate. In addition, a large number of small protrusions that protrude smaller than the large protrusions are provided on either the outer surface or the inner surface of the spacing plate, and the large protrusions are formed into a conical shape. is there.

According to the first characteristic configuration of the present invention, the flat plate and the interval holding plate are formed of a metal plate, while ensuring heat resistance, the surface on either one of the outer side surface and the inner side surface of the interval holding plate. A large number of large protrusions projecting upward are provided in a staggered arrangement, and a plurality of small protrusions projecting smaller than the large protrusions are provided on either the outer surface or the inner surface of the spacing plate. Thus, when the flat plates and the spacing plates are alternately stacked, there are different gaps between the flat plates and the spacing plates on the inner and outer sides of the spacing plates.
In other words, a large gap is formed in the space where the large protrusion exists, and a small gap is formed in the space where the small protrusion exists. Therefore, even if convection occurs in the large gap space, the small gap is formed. In this space, convection is less likely to occur, and heat transfer in the radial direction of the partial cylindrical metal casing can be suppressed.
In addition, since a large number of large protrusions are provided in a staggered arrangement on the surface of the spacing plate, the air that attempts to move in the circumferential direction is blocked by each large protrusion and the movement is inhibited. Convection in the air layer formed between the flat plate and the spacing plate is prevented.
In addition, by forming the large protrusion into a conical shape, the gap between the spacing plate and the flat plate can be secured with a little contact with the flat plate at the tip of the conical shape. Compared with it, it is easy to reduce a contact area, and can suppress the heat conduction by contact largely.
In addition, even if an external force acts in the radial direction of the partial cylindrical metal casing, the large conical protrusion has a large spacing maintaining strength with the flat plate, and the spacing plate is placed in the partial cylindrical casing. Even when it is bent along the curved surface of the partial cylindrical casing, it is easily deformed evenly in any bending direction. That is, when the large protrusion is a pyramid, for example, the linear base of the pyramid may hinder a smooth bending deformation operation, whereas the base of the conical protrusion is circular, The circular bottom surface is easy to follow any curved surface and allows smooth bending of the spacing plate.
Accordingly, it is possible to improve heat insulation by reducing heat conduction while facilitating bending.

  According to a second characteristic configuration of the present invention, a plurality of the large protrusions are formed in a large protrusion row arranged along the longitudinal direction of the heat insulation object, and the large protrusion row is arranged around the heat insulation object. A plurality of small protrusions are formed in a partial spherical shape and arranged in parallel between the large protrusion rows arranged in the circumferential direction of the heat insulation object.

According to the second characteristic configuration of the present invention, in addition to achieving the above-described operational effect according to the first characteristic configuration of the present invention, a plurality of large protrusions are arranged in the longitudinal direction of the heat insulation object. When forming a plurality of large protrusion rows arranged in parallel in the circumferential direction of the heat insulation object and bending the spacing plate in the circumferential direction of the heat insulation object, Since only the small protrusions are provided between the large protrusion rows, the bending resistance with respect to the spacing plate is small, and the large protrusion rows can be easily bent.
Therefore, workability can be improved.

It is a perspective view which shows the installation state of the metal covering heat insulation apparatus of this invention. It is a disassembled perspective view before installation of the metal covering heat insulation apparatus of this invention. It is a partially notched side view which shows the installation state of the metal-coated heat insulation apparatus of this invention. It is a partially notched front view which shows the installation state of the metal-coated heat insulation apparatus of this invention. It is a one part perspective view of a space | interval holding | maintenance board. It is a top view of a part of space | interval holding | maintenance board. It is a perspective view of the metal-coated heat insulation apparatus of another embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
For example, heat insulation objects having cylindrical outer peripheral surfaces such as pipes, steam generators, pressurizers, primary cooling pumps, cylindrical tank-type pressure vessels in nuclear power generation facilities, experimental nuclear reactors and other various nuclear facilities As shown in FIGS. 1 to 4, as shown in FIGS. 1 to 4, a circular shape is used for a heat insulating object 6 having a columnar outer peripheral surface so that heat can be kept and replacement work can be performed in a short time to minimize radiation exposure. A box-shaped partial cylindrical metal casing 2 that can be arranged along the columnar outer peripheral surface and has a curved surface 1 along the outer peripheral surface is provided. 2, a plurality of flat plates 3 along the curved surface 1 and a surface holding plate 4 having surface irregularities are alternately stacked in the heat flow direction, and the flat plate 3 and the space holding plate 4 are formed of metal plates. Any one of the outer side surface and the inner side surface of the spacing plate 4 A large number of large protrusions 8 that protrude in a staggered manner are provided in a staggered arrangement, and a partial spherical shape protrudes smaller than the large protrusion 8 on either the outer surface or the inner surface of the spacing plate 4. A large number of small protrusions 9 are provided in a dispersed manner, and the large protrusions 8 are formed in a conical shape to constitute a metal-coated heat insulating device.

  The partial cylindrical metal casing 2 is formed of a stainless steel metal plate having a thickness of 0.4 to 0.6 mm. When the heat insulating object 6 is a fluid pipe, the partial cylindrical metal casing 2 is formed in a half-cylindrical shape that is split into two ( In some cases, it is divided into three or more parts in the circumferential direction), in the case of steam generators, pressurizers, primary cooling pumps, tanks, etc. By forming and assembling a plurality of partial cylindrical metal casings 2 and connecting adjacent ones with connecting members such as buckles 5 laid at the ends, the heat insulating object 6 can be covered with heat over the entire circumference. Configure as follows.

Further, in the partial cylindrical metal casing 2, the first end surface portion 10 in the circumferential direction is provided with a large number of holes or a mesh shape so that heat conduction from the heat insulation object can be reduced. The second end surface portion 11 in the longitudinal direction is formed by providing a large number of holes or by forming a cross-linked shape such as X or N shape, and, like the first end surface portion 10, heat conduction from the heat insulating object. It can be reduced.
In addition, inside the first end surface portion 10 and the second end surface portion 11, a partition plate 12 of a thin metal plate that divides the internal space of the partial cylindrical metal casing 2 from the outside is disposed, so that air in the internal space is externally exposed. It is configured to prevent leakage and maintain heat insulation performance (FIGS. 2 to 4).

  The flat plate 3 is a heat insulating material formed by forming a metal plate having a mirror surface or a substantially mirror surface made of stainless steel or aluminum having a thickness of 50 μm into a partially cylindrical shape along the curved surface 1 of the partially cylindrical metal casing 2. The flat plate 3 itself has the shape retaining property while increasing the reflectance with respect to the radiant heat from the object 6.

  As shown in FIGS. 2 to 6, the spacing plate 4 is made of a thin metal plate made of stainless steel or aluminum having a thickness of 50 μm like the flat plate 3, and has a large projection 8 formed in a conical shape on the outer surface. A plurality of protrusions are formed in a large protrusion row arranged along the longitudinal direction of the heat insulation object, and a plurality of large protrusion arrays are arranged in parallel in the circumferential direction of the heat insulation object to form a partial spherical shape. A plurality of the formed small protrusions 9 are protruded from the inner surface by about 3 mm, and a plurality of small protrusions 9 are arranged in parallel between the large protrusion rows arranged in the circumferential direction of the object to be insulated (FIGS. 5 and 6).

[Another embodiment]
Other embodiments will be described below.

<1> The large protrusion 8 and the small protrusion 9 provided on the interval holding plate 4 may be provided on either the outer side surface or the inner side surface of the interval holding plate 4 or the other side surface. For example, the large protrusion 8 may be provided on the inner surface and the small protrusion 9 may be provided on the outer surface.
<2> The flat plate 3 and the spacing plate 4 may have a thickness of 0.03 to 0.3 mm, and may have a thickness of 0.03 mm or less as long as they have strength.
<3> The shape of the first end surface portion 10 and the second end surface portion 11 of the partial cylindrical metal casing 2 may be one having a large number of openings as shown in FIG.
<4> The metal-coated heat insulating device may be provided with a lead sheet for radiation shielding.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Curved surface 2 Partial cylindrical metal casing 3 Flat plate 4 Space | interval holding plate 6 Heat insulation object 7 Heat insulation material 8 Large protrusion 9 Small protrusion

Claims (2)

A box-shaped partial cylindrical metal having a curved surface along the columnar outer peripheral surface, and a plurality of heat insulating objects having a columnar outer peripheral surface can be disposed along the columnar outer peripheral surface. A casing is provided, and a heat insulating material is accommodated in the partial cylindrical metal casing,
As the heat insulating material, a metal-coated heat insulating device in which a plurality of flat plates along the curved surface and uneven surface-preserving spacing plates in the partial cylindrical metal casing are alternately stacked in the heat flow direction. There,
Forming the flat plate and the spacing plate with a metal plate;
While providing a large number of large projections in a staggered arrangement on the surface of any one of the outer surface and the inner surface of the spacing plate,
A plurality of small protrusions that protrude smaller than the large protrusions are provided on either the outer side surface or the inner side surface of the spacing plate.
A metal-coated heat insulating device in which the large protrusion is formed in a conical shape. A plurality of the large protrusions are formed in a large protrusion row arranged along the longitudinal direction of the heat insulating object, and a plurality of the large protrusion arrays are arranged in parallel in the circumferential direction of the heat insulating object.
The metal-coated heat insulating device according to claim 1, wherein a plurality of the small protrusions are formed in a partial spherical shape and are arranged in parallel between the large protrusion rows arranged in the circumferential direction of the heat insulating object.

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