JPS6325150Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a multilayer insulation material used to insulate piping dewars. This invention was devised in the process of improving the cryogenic piping of the prototype unit cryopump, and is used in electrical machinery and related fields.

Prior Art The conventional technology will be explained with reference to FIGS. 7 to 10.

Conventionally, as shown in Fig. 7, reflective materials 2, 3, and 4 made of plastic film are deposited with aluminum or the like on one or both sides in order to insulate the piping 1 in multiple layers.
and spacers 5 were wound alternately one layer at a time to form n layers. In general, n is 10 or more, and this conventional method requires a large amount of time for the winding operation. In order to solve this problem, as shown in Figs. 8 and 9, a multilayer insulation material was created by sewing together the n reflective materials 2, 3, and 4 and the spacer 5 with a thread 6 having poor thermal conductivity. 10th using
The process was carried out as shown in the figure. This streamlined the work involved, but in this case,
The first layer 2 of the reflective material in contact with the piping 1 and the n-th reflective material layer 4, which is the outermost layer and has the largest temperature difference from the piping 1, come into contact only through the spacer at the overlapping portion.
For this reason, heat conduction occurred between the outermost reflective material nth layer 4 and the reflective material first layer 2 in contact with the piping, resulting in poor heat insulation performance. In addition, in this conventional integrated multilayer insulation material, since the ends 7 of the reflective material are aligned,
When rolled into the pipe 1, the outer layer becomes larger in diameter, so as shown in FIG. 9, the ends 7, which were aligned before being rolled, become misaligned when rolled. As a result, the first layer 2 of the reflective material in contact with the piping was exposed, and radiant heat was directly transferred to the outside, further deteriorating the heat insulation performance.

Problems to be Solved by the Invention The present invention was developed in view of the above-mentioned shortcomings of the prior art.It solves the problem of creating a multilayer insulation material that does not require a large amount of time for winding work and has good heat insulation performance. Ru.

The present invention provides a multilayer insulation material in which a plurality of reflective materials are stacked one on top of the other, and the ends of each set of reflective materials with spacers are sequentially shifted to form an integrated structure.

By wrapping the multilayer heat insulating material of the present invention around the pipe, a multilayer heat insulating pipe with good heat insulation performance is provided in which the lowest temperature side reflective material and the highest temperature side reflective material do not come into contact with each other.

The term "piping" used in the present invention means a closed pipe or an open pipe with a hollow interior. Therefore, it also includes Juwar.

Means for Solving the Problems The above-mentioned problems can be solved by sequentially shifting the ends of each set of reflective materials with spacers in a multilayer insulation material in which a plurality of reflective materials are stacked one on top of the other. resolved.

Hereinafter, the configuration of the present invention will be explained with reference to the accompanying drawings.

FIG. 1 shows a multilayer heat insulating material according to the present invention, which is an integral type of reflective materials 2, 3, and 4 with a plurality of spacers 5, with the end portions of each reflective material 2, 3, and 4 shifted for each set.
3 and 4 are fixed by a thread 6 or the like having poor thermal conductivity. The width of the shift is determined as the width that allows each layer of the multilayer insulation material to be wound concentrically without overlapping, as shown in FIG. That is, the end portion of the first layer 2 of the reflective material 2 overlaps the start portion of the first layer 2 of the reflective material 2 and does not overlap the start portion of the second layer 3 of the reflective material. Hereinafter, the end of the winding of the n-th layer of reflective material overlaps the start of winding of the m-th layer of reflective material, but is made not to overlap the start of winding of the (m+1)th layer of reflective material.

Figure 3 shows another multilayer insulation material according to the present invention, in which a plurality of reflective materials 2, 3, and 4 are sewn together with threads 6 with poor heat conduction, and the left end 7'
are aligned, but the right end 7 is out of alignment. After wrapping the heat insulating material of the present invention around the piping 1 as shown in FIG. 4, the parts that are not around the piping 1 are bent as shown in FIG. At this time, the left end 7' of the reflecting material was bent, so that the outer layer is further away from the bending point. That is, the reflective material nth
The layer 4 extends farthest and the first layer 2 of reflective material reaches only the closest. On the other hand, the end portion 7 of the right side reflective material has the first layer of reflective material 2, the second layer of reflective material 3, the nth layer of reflective material 4,
In general, the mth layer of reflective material is such that the first layer of reflective material 2, the second layer of reflective material 3, and the nth layer of reflective material 4 generally reach the position of the mth layer of reflective material at the left reflective material end 7'. Make it. Further, in order to facilitate the winding work, it is also possible to use a multilayer heat insulating material as shown in FIG. 6, in which not only one end as shown in FIG. 3 but both ends are shifted.

Effects of the invention The multilayer insulation material shown in Fig. 1 according to the invention, the multilayer insulation piping shown in Fig. 2 using the same, and the multilayer insulation piping shown in Fig. 3 or 6.
In the multilayer insulation material shown in the figure and the multilayer insulation piping shown in Figure 5 using this material, the multilayer insulation material is made by sewing together multiple pieces of reflective material, so multiple pieces can be wrapped around the piping at once, and this work can be done easily. Doesn't require a lot of time. Further, as shown in FIG. 2 or FIG. 5, the first layer of reflective material 2 in contact with the pipe 1 contacts only the second layer of reflective material 3 with respect to the reflective material on the outside thereof. Hereinafter, the m-th layer of reflective material contacts only the (m+1)th layer of reflective material with respect to the outer reflective material. Therefore, conductive heat transfer from the n-th layer 4 of the reflective material, which is the outermost layer, to the pipe 1 is performed through each layer of the reflective material, resulting in good heat insulation performance. Furthermore, the end portion of the m-th layer of reflective material is covered with the (m+1) layer of reflective material in both FIGS. 1 and 4. Radiant heat transfer with the outside is also carried out through each reflective material layer from the outermost reflective material n-th layer 4 to the piping 1, so that the heat insulation performance is good.

As described above, according to the present invention, it is possible to produce a multilayer insulation material and multilayer insulation piping that do not require a large amount of time for winding work and have good heat insulation performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an example of a multilayer insulation material according to the present invention. FIG. 2 is a sectional view of an example of multilayer insulation piping according to the present invention. FIG. 3 is a sectional view of an example of a multilayer insulation material according to the present invention. FIG. 4 is a sectional view showing the process of wrapping the multilayer insulation material of FIG. 6 into piping. FIG. 5 is a sectional view of an example of multilayer insulation piping according to the present invention. FIG. 6 is a sectional view of an example of a multilayer insulation material according to the present invention. Figure 7 shows a conventional multi-layer insulated piping with reflective material wrapped one layer at a time. Figure 8 shows a conventional multilayer insulation material that integrates multiple reflective materials. FIG. 9 is a cross-sectional view of the conventional multilayer insulation material (FIG. 2). Figure 10 shows multilayer insulation piping that incorporates conventional multilayer insulation material. Explanation of numbers, 1... Piping, 2... Reflective material 1st
layer, 3... second layer of reflective material, 4... nth layer of reflective material,
5... Spacer, 6... Thread with poor heat conduction, 7,
7'... End of reflective material.

Claims (1)

[Scope of utility model registration request] 1. A multilayer insulation material made of a plurality of reflective materials stacked one on top of the other, in which the ends of each set of reflective materials with spacers are sequentially shifted to form an integrated structure.