JPH02132868A - Load supporting equipment - Google Patents

Abstract

PURPOSE:To improve a load support of this design in both strength and heat insulating property by a method wherein a part between two points different from each other in temperature is constituted in a multilayer structure, a part between one end of a layer and another layer is formed in a heat insulating structure, and a bearing section supporting a shock load is provided between the layers. CONSTITUTION:When a support 1 side is cooled down, a first cylinder 9 of a strength member shrinks more than a cylinder 11 of an insulating member, because the thermal conductivity of the cylinder 9 is larger than that of the cylinder 11, so that a free end 9a of the cylinder 9 becomes free separating from a step 11a of the cylinder 11 and a load applied onto the cylinder 11 can be beared by the cylinder 9 connected to a joint 15b. And, in this state, the cylinder 9 is not conducive to a heat flow and heat is conducted to the cylinder 11 small in thermal conductivity, so that a load support of this design can be improved in heat insulating property. Moreover, when a large load is temporarily applied in a direction of compression, the cylinder 9 bears the load as the cylinder 11 is made to shrink and the step 11a of the cylinder 11 is made to bear on the free end 9a of the cylinder 9, so that a load support of this design can bear a large load.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION <<Industrial Application Field>> The present invention relates to a load supporter with a folded structure used for supporting, for example, a superconducting magnet.

(Prior art) As a conventional load support device, for example, the one shown in Fig. 3 is known. 10
1 side and supports the engaging tool 103 in a vacuum container that is at room temperature.Concentric cylinders 109, 111, and 113 connecting the supporting tool 101 side and the engaging tool 103 side are provided, and these cylinders 109 , 111 and 113 are connected alternately to form a folded structure. That is, the flow of heat is proportional to the thermal conductivity and area of the material connecting the low-temperature side and the high-temperature side, and inversely proportional to the distance. Therefore, by adopting the folded structure described above, the heat flow becomes longer than the distance between the low temperature end (support 101), which has a substantial temperature difference, and the high temperature @ (locking metal fitting 103), which is higher than this low temperature end. It is configured as follows.

The cylinders 109, 111, 113 are made of materials with low thermal conductivity such as stainless steel or FRP (fiber reinforced plastic).In the conventional example shown in FIG. 3, for example, the cylinder 109 on the low temperature side is made of CFRP. (carbon fiber reinforced plastic), and the other cylinders 111 and 113 are made of G
F.R.P. (Glass fiber reinforced plastic) is used. The joint portions 117 of the folded portions 115 of these cylinders 109, 111, and 113 are jointed by a combination of screw engagement and adhesive, respectively. Further, a joint 117 between the cylinder 109 and the end joining jig 107 is joined in the same manner.

By the way, a load support with such a structure can withstand shock loads caused by earthquakes, etc., which are applied only for a short period of time.
It must be able to withstand that load. For this reason, conventionally, each cylinder 109.1ii. For example, the thickness of each of the parts 113 is set thick. This is because strength is proportional to cross-sectional area and inversely proportional to length.

However, such load supports are often too rigid for steady loads, and the larger the cross-sectional area of the cylinders 109, 111, 113, the more heat will flow through them. There is a problem in that this defeats the purpose of minimizing heat flow.

<Problems to be Solved by the Invention> As described above, in the conventional load support device, it is extremely difficult to simultaneously improve strength and heat insulation performance even though the folded structure is adopted.

Therefore, an object of the present invention is to provide a load supporter that can improve both strength and heat insulation performance.

[Structure of the Invention <Means for Solving the Problems>> In order to achieve the above object, the present invention provides a load supporter with a folded structure that supports a load by connecting two points having a temperature difference. At least a part of the structure between two points has a multilayer structure, a heat insulating structure is formed between one end side of at least one layer and another layer, and an abutment part that receives an impact load is provided between both layers.

In addition, the insulation structure was constructed from the gap between the two layers.

Furthermore, the multilayer structure is made of materials with different coefficients of thermal expansion, and serves as a heat insulating member between two points and a strength member when an impact load is applied.

(Function) In such a structure, heat flows through layers other than at least one of the multilayers, improving insulation performance, and when a temporary impact load is applied, the load is absorbed through the abutment part. will receive.

When the insulation structure has a gap between the two layers, this gap suppresses the flow of heat to at least the - layer when a steady load is applied, and when an impact load is applied, the gap disappears due to the deformation of the layers and the abutting part Contact and receive load.

When a multilayer structure is constructed of materials with different coefficients of thermal expansion, and a heat insulating member and a strength member are used, heat flows through the heat insulating member during a steady load, and the strength member acts during an impact load.

(Example" Embodiments of the present invention will be described below based on the drawings.

? FIG. 1 shows a cross-sectional view of a low-temperature load supporter according to an embodiment of the present invention.

This load supporter is used to support the superconducting magnet as described above, and supports the superconducting magnet immersed in 4.2K liquid helium from a vacuum container at room temperature.

The liquid helium side is the supporting tool 1, and the vacuum container side which is at room temperature is the engaging tool 3.

A concentric first cylinder 9 and a second cylinder 11 on the low temperature side are provided. The first cylinder 9 and the second cylinder 11 are located at the innermost side by the folded portion 13a.

The embodiment of this invention is implemented in this part, and the first
The cylinder 9 and the second cylinder 11 are constructed using two birch-like materials having different coefficients of thermal expansion.

That is, the first cylinder 9 is made of GFRP which has a high coefficient of thermal expansion and high strength as a strength member, and the wall thickness etc. are configured so that it can temporarily withstand a large load (impact load). The cylinder 11 is made of CF having a low thermal conductivity as a heat insulating member.
By using RP, the wall thickness etc. are configured so that it can withstand the load during steady state.

The first cylinder 9 and the second cylinder 11 are connected to the folded part 13.
In a, they are connected to each other at a joint 15a using a joining means combining screw engagement and adhesive, for example. Further, the second cylinder 11 is connected to the support 1 on the low temperature side at the joint 15.
Similarly connected at b. Furthermore, the free portion 19a of the first cylinder 9 is assembled in contact with the stepped portion 11a of the second cylinder 11, and constitutes the abutting portion of this embodiment. Therefore,
This load supporter has a multi-occupancy structure at least in part between two points with a temperature difference.

Note that the thick and thin parts formed in the first cylinder 9 and the second cylinder 11 do not need to be formed over the entire length of the cylinders 9 and 11, respectively, but are only formed in a part between them in the longitudinal direction. But you can get the same effect.

Further, a third cylinder 17 is similarly connected to the outer periphery of the folded portion 13a of the first cylinder 9 at a joint portion 15c. This third cylinder 17 is made of stainless steel due to size and strength constraints. A fourth cylinder 19 is similarly connected to this third cylinder 17 at a joint part 15d at a folded part 13b, and the warm side of this fourth cylinder 19 is connected to an end joining jig 21 and a joint part 15d. 15e are connected in the same way. Said fourth cylinder 1
9 uses GFRP because it has a large diameter and can be formed with a wide cross-sectional area even if the wall thickness is thinned.

Next, the operation of a load supporter having such a structure will be described.

When the support 1 side cools down, the thermal conductivity of the first cylinder 9, which is a strength member, is higher than that of the second cylinder 11, which is a heat insulating member, so that the first cylinder 9 becomes the second cylinder 11. The free end 9a of the first cylinder 9 is separated from the stepped portion 11a of the second cylinder 11 and becomes free. Therefore, a steady load, ie, a tensile force due to the mth generation of the superconducting magnet, is applied to the second cylinder 11, but this load can be withstood by the first cylinder 11. In such a state, the first cylinder 9, which is a strength member, does not contribute to the flow of heat, and the heat flows through the second cylinder 11, which is a heat insulating member with low thermal conductivity. Therefore, the heat insulation performance is improved.

Furthermore, during transport of the superconducting magnet or during an earthquake, a large load in the compressive direction is temporarily applied to the load strain supporter. In this case, the second cylinder 11, which is a heat insulating member, is contracted by the load, and the stepped portion 11a of the second cylinder 11 comes into contact with the self-height end 9a of the first cylinder 9, which is a strength member. The first cylinder 9 is also subjected to a load, and the load supporter is able to withstand a large load, and when this load is removed, the free end 9a of the first cylinder 9 and the second cylinder 11 are The contact with the stepped portion 11a is released, and high heat insulation performance can be obtained again.

FIG. 2 shows another embodiment of the invention.

Note that the same elements as those in the above embodiment will be described with the same reference numerals.

In this embodiment, the free 1 of the first cylinder 9 as a strength member is
9a and the stepped portion 11 of the second cylinder 11 as a heat insulating member
A gap 23 is formed from the beginning between the

In such a structure, when a steady load is applied to the load supporter, the free end 9a of the first cylinder 9 is free, so it does not contribute to the flow of heat and the heat is transferred to the second cylinder 11.
Flows only. Therefore, high heat insulation performance can be obtained.

Further, when a large load is temporarily applied to the load supporter, the second cylinder 11 contracts due to the load, and the stepped portion 11a of the second cylinder 11 becomes the free end 9a of the first cylinder 9. The first cylinder 9 also receives a load. Therefore, the load supporter 1 can withstand even a large load m, and when this load is removed, high local heat performance can be obtained again.

Furthermore, in this embodiment, the longitudinal dimensions of the first cylinder 9, etc. can be easily set.

The load supporter according to the embodiment of the present invention has an outer diameter larger than that manufactured by a conventional method by only the second circle 811 made of CFRP as a heat insulating member. Although the external appearance is almost the same and large, the heat flow during steady state is reduced by about two orders of magnitude, and the insulation performance is improved.

Note that this invention is not limited to supporting superconducting magnets, but can be widely applied to supporting a load between two points with a temperature difference.

[Effect of the Invention 1] As is clear from the above description, according to the structure of the load supporter of the present invention, strength to withstand a large load can be obtained, and the heat insulation performance can be improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a load supporter according to an embodiment of the present invention, Fig. 2 is a sectional view of a load supporter according to another embodiment of the invention, and Fig. 3 is a sectional view of a load supporter according to a conventional example. FIG. 1... Support tool (low temperature side) 3... Engagement tool (high temperature side)
9... First cylinder (strength member) 11... Second cylinder (insulation member)

Claims (3)

[Claims] (1) In a load supporter with a folded structure that supports a load by connecting two points with a temperature difference, at least a part of the structure between the two points has a multilayer structure, and one end side of at least one layer and one end side of the other layer are formed between the two points. A load supporter characterized by having a heat insulating structure between the layers and an abutting part that receives an impact load between the two layers. (2) The load support device according to claim 1, wherein the heat insulating structure is a gap between both layers. (3) The load support device according to claim 1 or 2, wherein the multilayer structure is made of materials having different coefficients of thermal expansion, and serves as a heat insulating member between two points and a strength member when an impact load is applied.