JP2019081554A - Duplex insulating container - Google Patents

Abstract

To provide a duplex insulating container whose bellows pipe is hard to break even if the inner pipe is deformed by the thermal expansion.SOLUTION: A duplex insulating container 10 consists of an inner pipe 11 with a bottom 11b and a flange 11f at one end 11a, an outer pipe 12 with a bottom 12b, which is arranged outside of the inner pipe 11 and covering a part of the inner pipe 11 including the bottom 11b, and a bellows pipe 13 with one end 13a connected to the flange 11f and the other end 13b connected to an end 12a of the outer pipe 12. A closed space 10c decompressed is formed as surrounded by the inner pipe 11, the outer pipe 12 and the bellows pipe 13. The flange 11f has a rounded first curved surface Rs1, and the end 13a of the bellows pipe has a rounded second curved surface Rs2. The first curved surface Rs1 and the second curved surface Rs2 physically contact with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double insulation container, and more particularly to a double insulation container in which a bellows pipe is not easily damaged even if the inner pipe is deformed by thermal expansion.

  There is known a double insulation container in which a closed space between an inner pipe and an outer pipe constituting a double pipe is decompressed to a vacuum. This double insulation container has a structure in which the end of the inner pipe and the end of the outer pipe are connected via a bellows pipe. The end of the inner pipe and one end of the bellows pipe are connected and fixed by welding or the like. When the inner pipe is deformed in the direction in which the inner diameter is expanded due to thermal expansion, a large stress is applied to the straight portion at one end of the bellows pipe. By repeating heating and cooling, the inner pipe is deformed each time heating is performed, stress is applied to the straight portion of the bellows pipe, and the straight portion may be broken.

  Patent Document 1 discloses a double-pipe light collecting / collecting receiver in which a glass heat insulating pipe is disposed concentrically around the outer periphery of a heat collecting pipe, and the end portion of the collecting / collecting receiver A metal bellows pipe connected to the end of the heat insulation pipe is disposed on the outer periphery of the heat pipe, and the other end of the bellows pipe is connected to the outer peripheral surface of the heat collection pipe via a thin metal buffer member. A thermal receiver is disclosed. The bellows pipe described in Patent Document 1 has straight portions at both ends. Therefore, when the heat collection tube is deformed due to thermal expansion, a large stress is applied to the straight portion of the bellows tube, and the straight portion is bent, resulting in a problem that the bellows tube is broken.

JP 2012-122693 A

  As described above, when the inner pipe is deformed by thermal expansion, a large stress is applied to the straight portion of the bellows pipe, the straight portion is bent, and the bellows pipe is broken.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a double insulation container in which the bellows pipe is not easily damaged even if the inner pipe is deformed by thermal expansion.

The present invention
An inner tube having a bottom and a flange at its end;
An outer pipe having a bottom and provided outside the inner pipe and covering a portion including the bottom of the inner pipe;
A bellows pipe having one end connected to the flange and the other end connected to the end of the outer pipe;
Equipped with
A sealed space is formed between the inner pipe, the outer pipe and the bellows pipe,
The flange has a rounded first curved surface portion,
The one end has a rounded second curved surface portion,
The first curved surface portion and the second curved surface portion are in physical contact with each other;
It is a double insulation container.
According to such a double insulation container, the flange connected to one end of the bellows pipe has a first curved surface with a rounded shape, and the one end of the bellows pipe has a rounded first shape. It has two curved surface parts, and these rounded curved surface parts are in physical contact with each other to connect the inner pipe and the bellows pipe. When the inner pipe is expanded in diameter, the second curved surface portion of the bellows pipe connected to the inner pipe is bent and the bellows pipe is easily deformed. As a result, stress is less likely to concentrate on the bellows pipe, and the bellows pipe is less likely to be broken.

The present invention
An inner tube having a bottom and a flange at its end;
An outer pipe having a bottom and provided outside the inner pipe and covering a portion including the bottom of the inner pipe;
A bellows pipe having one end connected to the flange and the other end connected to the end of the outer pipe;
Equipped with
A sealed space is formed between the inner pipe, the outer pipe and the bellows pipe,
The flange has a first plane parallel to the plane,
The one end has a second plane parallel to the first plane,
Physical contact between the first plane and the second plane,
It is a double insulation container.
According to such double insulation container, the flange of the inner pipe has a first plane parallel to the plane, and one end of the bellows pipe has a second plane parallel to the first plane, The planes are in physical contact with each other to connect the inner pipe and the bellows pipe. The first plane is parallel to the diameter expansion direction of the inner pipe, and the second plane is parallel to the first plane. Thus, the second flat surface at one end of the bellows pipe is parallel to the diameter expansion direction. By making one end of the bellows pipe parallel to the diameter expansion direction, the bellows pipe is easily bent when the inner pipe is expanded in diameter. As a result, stress is less likely to concentrate on the bellows pipe, and the bellows pipe is less likely to be broken.

  According to the present invention, it is possible to provide a double insulation container in which the bellows pipe is less likely to be damaged even if the inner pipe is deformed by thermal expansion.

FIG. 2 is a schematic cross-sectional view illustrating the double insulation container according to the first embodiment. It is typical sectional drawing of the part B shown in FIG. FIG. 2 is a schematic cross-sectional view illustrating the flange and the bellows pipe according to the first embodiment. FIG. 2 is a schematic cross-sectional view illustrating the double insulation container according to the first embodiment. FIG. 6 is a schematic cross-sectional view illustrating a double thermal insulation container according to a comparative example of the first embodiment. FIG. 5 is a schematic cross-sectional view of a portion C shown in FIG. 4; FIG. 6 is a schematic cross-sectional view illustrating a double insulation container according to a second embodiment. It is typical sectional drawing of the part D shown in FIG. FIG. 8 is a schematic cross-sectional view illustrating a flange and a bellows pipe according to a second embodiment. It is typical sectional drawing of the part D shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description will be omitted as appropriate for the sake of clarity.

First Embodiment
FIG. 1 is a schematic cross-sectional view illustrating the double insulation container according to the first embodiment.
FIG. 2 is a schematic cross-sectional view of a portion B shown in FIG.
FIG. 3 is a schematic cross-sectional view illustrating the flange and the bellows pipe according to the first embodiment.

  As shown in FIGS. 1 and 2, the double insulation container 10 according to the first embodiment includes an inner pipe 11, an outer pipe 12 and a bellows pipe 13. By connecting the high temperature inner tube 11 and the low temperature outer tube 12 by contact with the outside air via the bellows tube 13, the heat conduction (heat transfer) from the inner tube 11 to the outer tube 12 is suppressed .

  The inner pipe 11 has a bottom 11 b and a flange 11 f at an end 11 a.

  The outer pipe 12 has a bottom 12 b and is provided outside the inner pipe 11. The outer pipe 12 covers a portion including the bottom 11 b of the inner pipe 11.

  As shown in FIG. 3, one end 13 a of the bellows pipe 13 is connected to the flange 11 f, and the other end 13 b of the bellows pipe 13 is connected to the end 12 a of the outer pipe 12. The bellows tube 13 has a thin wall thickness and a long length. Thereby, since the heat transfer distance of the bellows pipe 13 can be lengthened, the heat transfer from the inner pipe 11 to the outer pipe 12 can be suppressed. In addition, since the bellows tube 13 has flexibility and acts as an elastic body, it is possible to absorb, to a certain extent, deformation due to the thermal expansion of the inner tube 11.

  Between the inner pipe 11, the outer pipe 12 and the bellows pipe 13, a pressure-reduced sealed space 10 c is formed. By making the enclosed space 10c a space in a vacuum state, the inner pipe 11 and the outer pipe 12 are well insulated from each other. The enclosed space may be referred to as a vacuum layer.

  When the inner pipe 11 is deformed in the direction in which the inner diameter R11 of the inner pipe 11 expands, the bellows pipe 13 is selectively bent in order to prevent stress concentration and large stress at the one end 13a of the bellows pipe 13. Make it easy.

  Specifically, the flange 11 f of the inner pipe 11 has a rounded first curved surface portion Rs1. One end 13a of the bellows tube 13 has a rounded second curved surface portion Rs2. Then, the first curved surface portion Rs1 and the second curved surface portion Rs2 are brought into physical contact to connect the bellows pipe 13 and the inner pipe 11.

  Preferably, the length of the radius of curvature Cr1 of the cross section of the first curved surface portion Rs1 of the flange 11f and the length of the radius of curvature Cr2 of the cross section of the second curved surface portion Rs2 of the one end portion 13a are substantially the same. For example, the length of the curvature radius Cr1 of the cross section of the first curved surface portion Rs1 of the flange 11f is 0.9 times to 1.1 times the length of the curvature radius Cr2 of the cross section of the second curved surface portion Rs2 of the one end 13a. I assume.

  The inner pipe 11 is thermally expanded by the temperature rise, and is deformed in the direction in which the inner diameter R11 is expanded. When the inner pipe 11 is deformed in the expansion direction of the inner diameter R11 by thermal expansion, the bellows pipe 13 connected to the flange 11f of the inner pipe 11 is pulled by the inner pipe 11, and is deformed in the expansion direction of the inner diameter R11. Due to this deformation, stress is concentrated at the one end 13a of the bellows pipe 13 and a large stress is exerted, which may damage the double insulation container 10 (bellows pipe 13).

  In addition, expansion of the inner diameter may be referred to as expansion. Also, the direction in which the inner diameter is expanded may be referred to as the diameter expansion direction.

  In the double thermal insulation container 10 according to the first embodiment, the flange 11 f of the inner pipe 11 has the rounded first curved surface portion Rs 1, and the one end 13 a of the bellows pipe 13 is rounded. It has a second curved surface portion Rs2 of a shape. Then, the inner pipe 11 and the bellows pipe 13 are physically connected (contacted) with each other by these rounded curved surface portions (the first curved surface portion Rs1 and the second curved surface portion Rs2) in a rounded surface. And are connected.

  When the diameter of the inner pipe 11 is increased, the bellows pipe 13 is easily deformed by selectively bending the second curved surface portion Rs2 of the bellows pipe 13 connected to the inner pipe 11. As a result, stress is less likely to be concentrated on the bellows pipe 13 as compared with the one in which the one end 13a of the bellows pipe 13 is straight, and the bellows pipe 13 can endure a large stress accordingly. The bellows pipe 13 is less likely to be broken, and the durability of the bellows pipe 13 is improved.

  As a result, it is possible to provide a double insulation container in which the bellows pipe is less likely to be damaged even if the inner pipe is deformed by thermal expansion.

Here, the details of the double insulation container 10 will be described.
FIG. 4 is a schematic cross-sectional view illustrating the double insulation container according to the first embodiment.

  As shown in FIG. 4, the dual insulation container 10 further includes a castable cement 14, a vacuum pump 15 and a leg 16.

  The inner pipe 11, the outer pipe 12, and the bellows pipe 13 are made of, for example, stainless steel.

  The castable cement 14 is heat resistant, and is provided inside the inner pipe 11 along the inner periphery of the inner pipe 11. The inside of the castable cement 14 is a storage space for storing the high-temperature molten metal W and the like. The molten metal W is, for example, aluminum.

  The vacuum pump 15 reduces the pressure in the closed space 10c to a vacuum by sucking the air in the closed space 10c.

  The leg portion 16 is provided on the bottom portion 12 b of the outer pipe 12 in order to install the double insulation container 10 so that the opening 11 m of the inner pipe 11 is on the upper side. A laminated material M is provided in a sealed space 10 c between the bottom 11 b of the inner pipe 11 and the bottom 12 b of the outer pipe 12.

  The double insulation container 10 further includes a lid 17, which is provided to cover the opening 11 m of the inner pipe 11. The lid 17 has a housing 17a, a heat insulating material 17b, a heater 17c, and a heater lead 17d.

  The housing 17a is made of, for example, stainless steel. The heat insulating material 17 b is provided inside the housing 17 a and is, for example, a ceramic fiber. Each of the housing 17a and the heat insulating material 17b is provided with a through hole for passing the heater lead wire 17d. The heater 17c heats the molten metal W by the power supplied from the outside through the heater lead wire 17d.

[Comparative example]
FIG. 5 is a schematic cross-sectional view illustrating a double insulation container according to a comparative example of the first embodiment.
6 is a schematic cross-sectional view of a portion C shown in FIG.
FIG. 6 shows the dual insulation container 40 after thermal expansion.

  As shown in FIG. 5, compared to the double insulation container 10 according to the first embodiment, the double insulation container 40 according to the comparative example does not have a rounded end of the end 43 a of the bellows pipe 43. It differs in that it is straight. Further, the shape of the flange 41f corresponding to the one end portion 43a is also different in that it is not a rounded shape.

  As shown in FIG. 6, when the inner pipe 41 is deformed in the direction of diameter expansion due to thermal expansion, the bellows pipe 43 connected to the flange 41f of the inner pipe 41 is thereby pulled by the inner pipe 41 and expanded. It deforms in the radial direction. Since the straight portion of the one end portion 43a of the bellows tube 43 is not easily bent, the bellows tube 43 is deformed as the straight portion is bent. Then, stress is concentrated at one end portion 43 a of the bellows pipe 43 and a large stress is exerted, which may damage the double insulation container 40.

  As a result, it is difficult to provide a double insulation container in which the bellows pipe is less likely to be damaged even if the inner pipe is deformed due to thermal expansion.

Second Embodiment
FIG. 7 is a schematic cross-sectional view illustrating the double insulation container according to the second embodiment.
FIG. 8 is a schematic cross-sectional view of a portion D shown in FIG.
FIG. 9 is a schematic cross-sectional view illustrating the flange and the bellows pipe according to the second embodiment.
FIG. 10 is a schematic cross-sectional view of the portion D shown in FIG.
FIG. 10 shows the dual insulation container 20 after thermal expansion.

  As shown in FIG. 7 to FIG. 9, the double insulation container 20 according to the second embodiment is different from the double insulation container 10 according to the first embodiment in the shape of one end 23 a of the bellows pipe 23. The shape of the flange 21 f of the inner pipe 21 is also different.

  The double insulation container 20 comprises an inner pipe 21, an outer pipe 22 and a bellows pipe 23. The inner pipe 21 has a bottom 21 b and a flange 21 f at an end 21 a. The outer pipe 22 has a bottom 22 b and is provided outside the inner pipe 21 and covers a portion including the bottom 21 b of the inner pipe 21. The bellows pipe 23 has one end 23 a connected to the flange 21 f and the other end 23 b connected to the end 22 a of the outer pipe 22. Between the inner pipe 21, the outer pipe 22 and the bellows pipe 23, a sealed space 20 c which is depressurized is formed.

  The flange 21 f of the inner pipe 21 has a first plane P1 parallel to the plane. One end 23a of the bellows pipe 23 has a second plane P2 parallel to the first plane P1. The physical contact between the first plane P1 and the second plane P2 connects the inner pipe 21 and the bellows pipe 23.

  In the double insulation container 20 according to the second embodiment, the flange 21f of the inner pipe 21 has a first plane P1 parallel to the plane, and one end 23a of the bellows pipe 23 is parallel to the first plane P1. It has a second plane P2. The one end 23 a of the bellows pipe 23 is extended in parallel with the flange 21 f of the inner pipe 21. Then, the inner pipe 21 and the bellows pipe 23 are connected by physically connecting (contacting) these planes (the first plane P1 and the second plane P2).

  As shown in FIG. 10, the inner pipe 21 is thermally expanded and deformed in the diameter expansion direction (the direction in which it is thermally expanded). The first plane P1 is parallel to the diameter expansion direction, and the second plane P2 is parallel to the first plane P1. Therefore, the second plane P2 of the one end 23a of the bellows pipe 23 is parallel to the diameter expansion direction. As described above, by making the one end portion 23a of the bellows pipe 23 parallel to the diameter expansion direction, the bellows pipe 23 is easily bent when the inner pipe 21 is expanded. As a result, stress is less likely to be concentrated on the bellows tube 23, and the bellows tube 23 is less likely to be broken.

  As a result, also in the second embodiment, it is possible to provide a double insulation container in which the bellows pipe is not easily damaged even if the inner pipe is deformed by thermal expansion.

  The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the scope of the invention.

  10, 20, 40 ... double insulation container 10c ... sealed space 11, 21, 41 ... inner pipe 11a ... end 11b ... bottom 11f, 21f, 41f ... flange 11m ... opening 12, 22, 42 ... outer pipe 12a ... End portion 12b: Bottom portion 13, 23, 43: Bellows tube 13a, 23a, 43a: One end portion 13b: Other end portion 14: Castable cement 15: Vacuum pump 16: Leg portion 17: Lid 17: Cover 17a: Casing 17b: Heat insulator 17c ... Heater 17d ... Heater lead wire B, C, D ... Portion Cr1, Cr2 ... Radius of curvature Rs1 ... First curved surface portion Rs2 ... Second curved surface portion P1 ... First plane P2 ... Second plane R11 ... Inner diameter M ... Laminated material W ... molten metal

Claims (2)

An inner tube having a bottom and a flange at its end;
An outer pipe having a bottom and provided outside the inner pipe and covering a portion including the bottom of the inner pipe;
A bellows pipe having one end connected to the flange and the other end connected to the end of the outer pipe;
Equipped with
A sealed space is formed between the inner pipe, the outer pipe and the bellows pipe,
The flange has a rounded first curved surface portion,
The one end has a rounded second curved surface portion,
The first curved surface portion and the second curved surface portion are in physical contact with each other;
Double insulation container. An inner tube having a bottom and a flange at its end;
An outer pipe having a bottom and provided outside the inner pipe and covering a portion including the bottom of the inner pipe;
A bellows pipe having one end connected to the flange and the other end connected to the end of the outer pipe;
Equipped with
A sealed space is formed between the inner pipe, the outer pipe and the bellows pipe,
The flange has a first plane parallel to the plane,
The one end has a second plane parallel to the first plane,
Physical contact between the first plane and the second plane,
Double insulation container.

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