JPS5984506A - Inner tank supporting apparatus for cryogenic container - Google Patents

Abstract

PURPOSE:To inhibit or alleviate the generation of thermal stress on the supporting bar at respective temperature in the heat cycle between the normal temperature and ultra-low tempera ture by supporting said supporting bar for internal tank so that it keeps natural length at the temperature range from the normal temperature to ultra-low temperature. CONSTITUTION:With the fixed point C in the side of an internal tank 2 of the supporting bar 6 at the normal temperature considered as the base point, an arc F is delineated with the radius equal to the length LR2 of supporting bar at the normal temperature. Thereafter, with the fixed point C' in the side of internal tank 2' of the supporting bar 6 at an ultra-low temperature considered as the base point, an arc F' is delineated with the radius equal to the length LC2 at an ultra-low temperature. The fixed point E in the side of external tank is set to the intersecting point of both arcs. Thereby, the internal tank supporting bar 6' is held in the thermally contracted natural length LC2 not allowing thermal stress even in case the ultra-conductor magnet is cooled to an ultra-low temperature. Accordingly, such a situation that the supporting bar and internal and external tanks which fix the supporting bar break due to an excessive thermal stress under an ultra-low temperature and finally the function of the main unit such as super-conducting apparatus is lost can be prevented, and as a result the internal tank supporting apparatus of safe ultra-low temperature container can be obtained.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] Fueniai is used to support the inner tank of a cryogenic container such as an ultra-high-temperature conducting device. The present invention relates to a suitable uchizo kozo that is subjected to thermal cycling.

[Prior art]

FIG. 1 is a schematic diagram of a conventional example in which a seven-layer magnet is supported. In the figure, the ultra-thin coil 1 is nestled in the inner tank 2.

Furthermore, the inner tank is supported from the outer tank 4 via a support column 3. This support column is connected to the inner tank and the outer tank by a fixed part on the inner tank side and a fixed part on the outer tank side. They are arranged in two rows, and 94 to 8 pieces per 1 inch are arranged radially within the cross section of Fig. 2. Are there four shown? Show lj.

In this structure, there is tAt inside the inner tank.
, inject body helium 5 (the injection system is not shown) and cool and maintain the superconducting coil 1 at an extremely low temperature.If the coil and inner tank are crushed by stones, the Mukang Wen Pillar will also be cooled around 1iil at room temperature and at an extremely low temperature. Temperature (cooled to an average temperature of

The inner tank 2 at a temperature of 'S' is cooled and converged into the inner tank 2' at a cryogenic temperature, and the support fixing point on the inner tank side moves from C to C'. For this reason, the appearance of the people in pillar 3 is 11. J8L
It is forcibly stretched from R to Lc at extremely low temperatures. However, if the shrinkage due to cooling of the pillar itself is L81, then in reality, ΔLt ”” (J'-c 10Lsl)
L) It will be stretched by one step. Therefore, by being stretched, the column has 5t=ExΔLI/L
A stress of +t t is generated. However, E is the pillar]9
Young's modulus of the family is shown.

The above-mentioned enlargement amount (thermal contraction i) depends on the temperature change from room temperature to cryogenic temperature. The current change is as high as 300 degrees Celsius, the amount of thermal contraction is large, and the thermal stress is also large.

Father, the same 4I of the pillar! The amount by which the fixed point C on the side moves toward C' is the distance (X) from the fixed point C in the device rucB, A).

Y). In recent years, the scale of this type of superelectric device has been rapidly increasing, and as a result, the amount by which the struts are stretched is maximized, and the stress generated is also increased accordingly.

In other words, the inner tank support column, the coil and the inner tank are cold 74]
Each time the temperature is increased by 50%, the above-mentioned stress is repeatedly applied, and the magnitude of the stress increases as the device becomes larger, reaching 3L, which exceeds the limit of the material strength of the support. This may lead to breakage of the support or breakage of one leg of the support.
The superconducting device enters a state of storm dog φ, which causes its functionality to fail.

[Purpose of the invention]

The present invention is designed to prevent thermal stress from occurring in the support struts at each temperature, even though the support struts for supporting the inner tank of a cryogenic container such as a superconducting device go through a thermal cycle If17 between room temperature and cryogenic temperature. Or, it is intended to reduce thermal stress.

[Summary of the invention]

The key point of the present invention is that the support struts for internal investigation are supported in such a way that the natural length of the struts at each temperature is maintained, and thermal stress is not generated, both at room temperature and at extremely low temperatures. It is something to do.

[Example of sound production]

An embodiment of the present invention will be explained below with reference to FIGS. 3 to 47.

FIG. 3 is a schematic diagram of a support configuration of a superconducting magnet according to the present invention.

The feature of the present invention is that by installing the outer tank 11111 fixing point Ek of the inner tank support strut 6 at the position described below, the inner tank support strut can be fixed even if the superconducting magnet is cooled to an extremely low temperature of 1 degree Celsius. 6' is maintained at its natural heat-shrinked length Lc2, thereby preventing thermal stress from occurring in the support column 6'.

That is, with the fixing point C on the inner tank side of the strut 60 at room temperature as the base point, draw an arc F with a radius of the length LR2 of the strut at room temperature, and mark the arrow on the 4' oil side of the strut at cryogenic temperature. Fixed point C'
(The fixed point moves due to heat shrinkage of the inner tank) is the base point, and the length L'c2 of the support at cryogenic temperature (the length decreases as the support shrinks due to heat) is the radius. Draw a circular arc F'.A fixed point E on the outer tank side is installed at the intersection of both circular arcs drawn in this way to eliminate the generation of thermal stress (thermal contraction restraining force) on the column 6' even at extremely low temperatures. .

In addition, Figure m4 is a detailed view of the 9th part of the conventional structure (Figure 1), and Figures 5, 6, and 7 are detailed views of Es of the present invention structure (Figure 3) a+1tI (various types). shows.

In Fig. 4, 7 is a washer, 8 is a nut, 3 is a support, and 4 is an outer tank. @1 As shown in Figure 1, the support column tilts at 01 as the inner tank rITs, and in such cases, an unreasonable bending blade is generally applied to the fixed parts at both ends. Therefore, by inserting the washer 9 and the nut 10 having spherical surfaces as shown in the fifth factor, it becomes possible to freely tilt the blade, thereby preventing the above-mentioned unreasonable bending.

- The position of the fixed point H on the outer tank side, which is the king-fu point of "Sword, misfire", cannot be set at a position that can maintain the length of the pillar Lctk light as described above (for example, If there are dimensional restrictions or there is interference with other structures, the fixing point should be slightly shifted from the ideal fixing point on the outer tank side. In this case, when the coils and inner parts are cooled to an extremely low temperature, the struts are cooled and can undergo natural thermal contraction, and a percentage of this becomes the core where the thermal contraction is restrained. It can be seen that the struts generate thermal stress (restraint force) by that amount.

In such a case, if an elastic body (for example, a disc spring 11) is inserted into the column fixing part as shown in FIG. 7, the heat shrinkage of the pole can be absorbed by the elasticity of the disc spring.

However, even without necessarily inserting an elastic body into the fixing part, the structural bodies of the two sides of the column (inner tank 2 side and outer tank 4 side) have the ability to elastically deform against the heat shrinkage restraining force. Motsu. In FIG. 8, the outer tank 4 and the inner tank 2 at room temperature are shown by solid lines. When the inner tank is cooled to an extremely low temperature and the struts 13 are cooled, they each undergo thermal contraction. When the inner tank and support can be naturally heat-shrinked, the inner tank is at the position 2', and the outer tank is at the position 4, which is the same as at room temperature. However, as mentioned above, when the heat shrinkage of the strut 13 does not remain natural and some percentage of the strut 13 is restrained, a restraining force acts on the restrained heat shrinkage and the strut, As the inner tank and outer tank are pulled together, they deform each other, and the outer tank becomes polygonal with a shape of 4" and the inner tank with a shape of 2".The strut 13 is also pulled by the st straight sword of the inner and outer tanks. # in state! r layer<. Therefore, if you install a fixed position on the outer tank side so that the restraint force of the inner and outer tanks and columns is within the allowable range, the elastic displacement of the structure of the inner and outer tanks can be used to reduce the heat shrinkage restraint force. An absorbed inner tank support device is obtained.

In addition, as in the example in Figure 5, Figure 6 shows an example in which a ball seat is used to prevent the bending blade from acting unreasonably on the fixed part when the support is tilted (θi in Figure 3). A seat 19 and a nut 10 are inserted in addition to the elastic body (plate 11).

〔Effect of the invention〕

According to the present invention, in an inner tank support device for a cryogenic container, the pillars, the inner tank and the outer tank to which the pillars are fixed can break due to excessive thermal stress at extremely low temperatures, which can lead to superelectric devices, etc. It is possible to prevent a situation where the function of the king is impaired, and to obtain an appropriately safe inner tank support device for a cryogenic container.

[Brief explanation of drawings]

Figure 1 is a diagram of the support configuration of a conventional superconducting magnet, Figure 2 is a horizontal PIR view of Figure 1, Figure 3 is a diagram of the support configuration of the superconducting magnet 5 of the present invention, and Figure 4 is a diagram of the support configuration of a conventional superconducting magnet. Fig. m1 is a static drawing of a structural example of the column fixing part, Figures 5 to 7 are detailed diagrams of various modifications of the column fixing part in Fig. 3, and Fig. 8 is a case in which the column is restrained by heat shrinkage. It is a modification explanatory diagram of. 1... Superconducting coil, 2.2', 2"... Inner tank,
3゜3', 6.6', 13... Support, 4.4".
...Outer tank, 5...Liquid helium (refrigerant), 9...Spherical washer, 10 Fig. 1 Fig. 3 Fig. 4 Fig. 5 Candle also 6 58
Taro 7 Maple δ Mouth

Claims (1)

[Scope of Claims] 1. A support column with one end fixed at the outer circumference riII of the inner tank containing the cryogenic liquid and the other end fixed to the outer 1'1M wall surrounding the inner tank. Arranged radially, '1i
In the device in which the inner and outer tanks are supported and fixed through the space between the inner and outer tanks, the support is characterized in that the first fixed position on the outer tank side of the support is installed at the position described below. Inner tank support device for cryogenic containers. 2. In claim 1, the inner tank side at low temperature (1
1 (
A fixing point on the outer tank side is installed at the intersection of both circular arcs when the distance is relatively increased or decreased by the length of the short profile compared to the relationship stated in the first claim, and the relative increase or decrease is An inner tank support device for a low-temperature vessel, characterized in that this short length is compensated for by the elastic liquid level of a structure on the side where the support is fixed. 3. An inner tank support device for a cryogenic container, characterized in that a spherical seat is provided at both or either one of the fixing points at both ends of the support in the first term or the second block of the range of the cool measure button. 4. Inner tank support for a cryogenic container whose indication is that it is supported via an elastic body on both ends of the fixed points of the support or any one of the fixed points at both ends in the range of load WitFJ requirements Item 1 or Item 2 Device.