JP2007154953A - Heat insulating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating device exhibiting excellent heat insulating performance, not using lead in order to shield radiation, light in weight, capable of saving labor in manufacturing the device, and capable of being easily cleaned even when being polluted by radiation. <P>SOLUTION: The heat insulating device 1 is equipped with an outer shell comprising an inside plate 2 arranged on a heat insulated body side, an outside plate 3 on its opposite side, and a side plate 4 arranged in the thickness direction; and a plurality of reflecting plates 5 arranged in the outer shell. The inside plate 2, the outside plate 3, the side plate 4 and the reflecting plates 5 are made of metal, and at least the inside plate 2 comprises a tungsten alloy. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat insulating device suitably used for various devices in, for example, a nuclear facility.

  Piping and equipment in nuclear facilities such as nuclear power plants are covered with covers and panels for heat insulation and radiation shielding. FIG. 6 shows a cross section of such a conventional cover. The cover 90 has rock wool, glass wool, or a thin metal plate inside a metal box composed of an inner plate 91 disposed on the side to be insulated, an outer plate 92 on the opposite side, and a side plate 93 disposed in the thickness direction. A plurality of heat insulating materials 94 are arranged, and a lead shielding material 95 is arranged in the stack. A member having such a configuration is disclosed in, for example, Patent Document 1 below.

JP 11-82874 A

  However, in order to increase the radiation shielding performance of the heat insulating device such as the cover or the panel, conventionally, it is necessary to make the thickness of the lead shielding material 95 provided in the inside 25 mm or more, which increases the weight of the heat insulating device. There is a problem. In addition, since the lead plate has a low softening point, it is necessary to coat the outside with a heat insulating material such as rock wool or glass wool, and there is a problem that it takes time to manufacture the heat insulating device. Furthermore, the use of lead is being seen as a problem from the environmental aspect, and it is required to take some measures. Furthermore, when rock wool or glass wool is used as the heat insulating material, there is a problem that if it is contaminated with radiation, it is difficult to clean it.

  Therefore, the object of the present invention is to have excellent heat insulation performance, do not use lead for radiation shielding, is lightweight, does not take time to manufacture the device, and even if it is contaminated with radiation. An object of the present invention is to provide an insulating device that can be easily cleaned.

  In order to achieve the above-mentioned object, the present invention provides an outer shell composed of an inner plate arranged on the side to be insulated, an outer plate on the opposite side and a side plate arranged in the thickness direction, and a plurality of arrangements in the outer shell. In the heat insulating device comprising the reflecting plate, the inner plate, the outer plate, the side plate, and the reflecting plate are made of metal, and at least the inner plate is made of a tungsten alloy. Is to provide.

  In the present invention, the tungsten alloy may be a tungsten-nickel-copper alloy, a tungsten-nickel-molybdenum alloy, a tungsten-nickel-iron alloy, a tungsten-nickel-iron-molybdenum alloy, or a tungsten-nickel-copper- It is an iron-based alloy, and the proportion of tungsten in the tungsten alloy is 90 to 97% by mass.

  The present invention also provides the above heat insulating device, wherein the heat insulating body is a pipe, and the outer shell is composed of two or more arcuate structures.

  The present invention also provides the above-described heat insulation device, which is used for heat insulation and radiation shielding.

  According to the present invention, it has excellent heat insulation performance, does not use lead for shielding radiation, is lightweight, does not take time to manufacture the device, and even if it is contaminated with radiation. An insulating device that can be easily cleaned can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1
Fig.1 (a) is a perspective view of the heat insulation apparatus of this invention (partially cutaway figure), (b) is AA sectional drawing. 1 (a) and 1 (b), a heat insulating device 1 according to the present invention includes an inner plate 2 arranged on the side to be insulated, an outer plate 3 on the opposite side, and a side plate 4 arranged in the thickness direction. Has a shell. 1 has a box shape, one inner plate 2 and one outer plate 3 are used, and four side plates 4 are used. A plurality of reflectors 5 are arranged in the outer shell. Spacers 6 are provided between the reflecting plates 5 to determine the interval between the reflecting plates 5. Further, as shown in FIG. 1B, the end 401 of the side plate 4 is bent so as to overlap the inner plate 2 and the outer plate 3, and the side plate 4, the inner plate 2 and the outer plate 3 are joined by the rivet 7 at the bent portion. By joining, the structure of the outer shell becomes robust and the reflector 5 is also fixed.
Moreover, Fig.2 (a) is a perspective view of another form of the heat insulation apparatus of this invention (partially cutaway figure), (b) is AA sectional drawing. The heat insulating apparatus 1 of the present invention shown in FIG. 2 is substantially the same as the apparatus shown in FIG. 1, but the interval between the reflecting plates 5 is determined by embossing 6 'provided on the reflecting plate 5 itself instead of the spacer 6. ing.

  The reflecting plate 5 is made of metal, and for example, stainless steel or aluminum is suitable. The thickness of the reflector 5 is preferably 20 to 200 μm. Within this range, the workability of the reflecting plate 5 and the mounting property to the outer shell are enhanced. The interval between the reflecting plates 5 is preferably 10 mm or less. If the distance between the reflecting plates 5 exceeds 10 mm, the heat insulating performance may be deteriorated due to air convection.

  And the heat insulation apparatus 1 of this invention is characterized by the inner side board 2, the outer side board 3, the side board 4, and the reflecting plate 5 being metal, and at least the inner side board 2 being comprised with the tungsten alloy. The tungsten alloy is preferably a tungsten-nickel-copper alloy, a tungsten-nickel-molybdenum alloy, a tungsten-nickel-iron alloy, a tungsten-nickel-iron-molybdenum alloy, or a tungsten-nickel-copper-iron alloy. Although mentioned as a thing, it is preferable that the ratio of the tungsten in the said tungsten alloy is 90-97 mass%, Preferably it is 93-97 mass%. If the tungsten content is less than 90% by mass, radiation shielding performance is deteriorated, which is not preferable. Further, if the tungsten content exceeds 97% by mass, the processing becomes difficult, which is not preferable.

  Tungsten alloy is excellent in heat resistance, so it can be used for the construction of the outer shell and does not need to be covered with another heat insulating member like lead. In addition, the tungsten alloy is excellent in radiation shielding performance. The thickness of the tungsten alloy used as the inner plate is preferably 5 mm to 20 mm. If the thickness is less than 5 mm, radiation shielding performance becomes insufficient, which is not preferable. In addition, since the mass of an outer shell will increase when thickness exceeds 20 mm, it is unpreferable. A more preferable tungsten alloy thickness is 5 mm to 15 mm.

In the present invention, as the metal used for the construction of the outer shell other than the inner plate, for example, stainless steel having a thickness of 0.5 mm to 2 mm is suitable, and as the metal used as the reflector, as described above, stainless steel or Although it is aluminum, the 1 or 2 or more member selected from the outer side plate 3, the side plate 4, and the reflecting plate 5 may be comprised with the tungsten alloy.
Joining of the inner plate and, if necessary, the tungsten alloy plate constituting the other member and the other member is the same as the embodiment described in FIG. Moreover, the heat insulation apparatus demonstrated in FIG. 1 or 2 may have the arc-shaped shape which has a curved surface other than a rectangle so that it may demonstrate below.

Embodiment 2
In this invention, it is preferable that a to-be-insulated body is piping and the said outer shell consists of two or more arc-shaped structures. Hereinafter, this preferable form is demonstrated in detail.
3 and 4 show an assembled state and a separated state of the heat insulating device according to the preferred embodiment of the present invention. The heat insulating device 11 is composed of two components 13 and 15 that are separable from each other. Each component 13, 15 has an inner plate 2, an outer plate 3 and a side plate 4. Each component 13 and 15 has an arc shape with a semicircular cross section. As shown in FIG. 3, in a state where the structural bodies 13 and 15 are assembled, the heat insulating device 11 is entirely cylindrical. Moreover, the handle 17 is provided in the structure 13 and 15 of the heat insulation apparatus 11 in consideration of the convenience at the time of conveyance. A buckle 19 that fixes both the structural bodies 13 and 15 in an assembled state is provided in the vicinity of the connecting portion of the structural bodies 13 and 15 so as to straddle both the structural bodies 13 and 15. Further, a cover 21 that covers the connecting portions of both the structural bodies 13 and 15 is provided in the vicinity of the connecting portion of the structural body 15 to the structural body 13. Further, a plate spring 22 is provided on the pipe side of the inner plate 2 to keep the distance from the pipe at, for example, 5 to 15 mm, and to prevent misalignment and provide good fixation.

  Next, the structure of each structure 13 and 15 is demonstrated based on FIG. FIG. 5 is a cross-sectional view of the structure 13 in the longitudinal direction. Since the structural body 15 also has the same structure as the structural body 13, description here is abbreviate | omitted. In FIG. 5, in order to insulate a long pipe, the two structures 13 and 13 ′ are connected.

  Constituent bodies 13 and 13 ′ basically have the same configuration as the heat insulating device described in the first embodiment, and the inner plate 2 on the side facing the pipe surface to be insulated is made of a tungsten alloy. The outer plate 3 and the side plate 4 are made of stainless steel. In addition, a plurality of aluminum reflectors 5 are disposed inside the components 13 and 13 '. The reflecting plate 5 is composed of a reflecting plate having a convex surface on which a planar reflecting plate and an emboss 6 'are formed, and these are arranged alternately. The emboss 6 'determines the interval between the reflecting plates 5. Further, the side plates 4 of the structural bodies 13 and 13 ′ are bent so that the end portions 401 overlap the inner side plate 2 and the outer side plate 3, and the side plates 4, the inner side plate 2 and the outer side plate 3 are joined by the rivets 7 at the bent portions. ing. Further, the connecting portion of the structural bodies 13 and 13 ′ is fixed by a buckle 51.

  Next, operation | movement of the heat insulation apparatus 11 comprised as mentioned above is demonstrated. First, the respective buckles 19 are unlocked to separate the structural bodies 13 and 15 from each other, and the structural bodies 13 and 15 are arranged so as to cover the pipe surfaces, respectively. And in the state which the heat insulation apparatus 11 becomes a cylinder shape around the piping surface, each buckle 19 is locked and both the structures 13 and 15 are connected. When the pipe is covered with the heat insulating device 11 as described above, even if radiation leaks from the pipe, it is efficiently shielded by the tungsten alloy constituting the inner plate 2 and can be easily cleaned. Further, heat generated from the piping is blocked by the tungsten alloy and the reflector 5.

  Moreover, when removing the heat insulation apparatus 11 from piping at the time of a maintenance, etc., the structure 13 and 15 can be isolate | separated only by unlocking each buckle 19, and can be easily removed by a short construction work. . Further, when the heat insulating device 11 is reattached after maintenance, etc., as in the case of newly attaching, after the structural bodies 13 and 15 are arranged in a cylindrical shape on the outer periphery of the pipe, each buckle 19 is locked. Just do it. Therefore, as in the case of removal, the heat insulation device 11 can be easily attached by a short construction work, and the heat insulation device 11 once removed can be used again.

  The number of components constituting the heat insulating device according to the second embodiment is not limited to two, and may be an embodiment composed of three or more components. Moreover, the connection aspect of each structure is not limited to the aspect completely isolate | separated from each other, but widely includes the aspect which can be open | released so that it can coat | cover or detach | leave with respect to piping from a cylindrical state.

  In the above-described embodiment, the embodiment in which the tungsten alloy is used only for the inner plate has been described. However, the heat insulating device of the present invention is one or more members selected from the outer plate, the side plate, and the reflector. May be made of a tungsten alloy.

  Since the heat insulation apparatus of the present invention employs a tungsten alloy without using lead that has been conventionally used for the purpose of heat insulation and radiation shielding, it does not pollute the global environment. In addition, the tungsten alloy used in the present invention is lightweight and extremely excellent in heat resistance, heat insulation performance, radiation shielding performance, and workability. Therefore, it takes less time to manufacture a device having desired characteristics. Furthermore, even if the heat insulating device of the present invention is contaminated with radiation, the inner plate, the outer plate, the side plate, and the reflecting plate are made of metal, and thus can be easily cleaned.

(A) is a perspective view of the heat insulation apparatus of this invention (partially cut-out figure), (b) is AA sectional drawing. (A) is a perspective view of another form of the heat insulation apparatus of the present invention (partially cutaway view), and (b) is an AA cross-sectional view. It is a figure which shows the assembly state of the heat insulation apparatus which concerns on embodiment of this invention. It is a figure which shows the isolation | separation state of the heat insulation apparatus which concerns on embodiment of this invention. It is sectional drawing of the longitudinal direction of both structure bodies in the heat insulation apparatus which concerns on embodiment of this invention. It is sectional drawing of the conventional cover for heat insulation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Heat insulation apparatus 2 Inner board 3 Outer board 4 Side board 5 Reflector 6 Spacer 6 'Emboss 19,51 Buckle 13,13', 15 Each structure

Claims (4)

In a heat insulating apparatus comprising an inner plate arranged on the side to be insulated, an outer plate on the opposite side and a side plate arranged in the thickness direction, and a plurality of reflecting plates arranged in the outer shell. ,
The inner plate, the outer plate, the side plate, and the reflecting plate are made of metal, and at least the inner plate is made of a tungsten alloy.   The tungsten alloy is a tungsten-nickel-copper alloy, a tungsten-nickel-molybdenum alloy, a tungsten-nickel-iron alloy, a tungsten-nickel-iron-molybdenum alloy, or a tungsten-nickel-copper-iron alloy. And the ratio of tungsten in a tungsten alloy is 90-97 mass%, The heat insulation apparatus of Claim 1 characterized by the above-mentioned.   The heat insulating device according to claim 1 or 2, wherein the heat insulating body is a pipe, and the outer shell is composed of two or more arc-shaped constituent bodies.   The heat insulation device according to claim 1, wherein the heat insulation device is used for heat insulation and radiation shielding.

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