JPH0729655Y2 - Cryogenic refrigerant container - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cryogenic refrigerant container, particularly a laterally long type cryogenic refrigerant container for accommodating superconducting equipment such as a superconducting cable.

[Conventional technology]

For superconducting devices, such as cryostats with built-in superconducting magnets as shown in Fig. 3 (the one shown is from Stanford University), the length of the superconducting cable does not matter Refrigerant is stored in one tank, and two gas cooling current leads (two are provided, although only one is visible in the + and − figures) are inserted in the same tank.

However, the superconducting device is not only used for the cryostat as described above, but naturally has applications in various devices. For example, in the case of a bus wire duct for electrical equipment between substations, or when a large current is passed between a power supply and a motor, there are cases where it is necessary to lay superconducting wires with a considerable distance between the equipment. is there.

[Problems to be solved by the device]

However, even in this case, each gas-cooled current lead separated by an ultra-long distance is helium below the tank (hereinafter referred to as He).
Is cooled by the change in enthalpy due to the evaporation of.
Therefore, when the flow rate of He to the two current lead wires is unbalanced, the temperature of the current lead wire with the smaller flow rate naturally rises, and as the temperature rises, the pressure loss further increases and the flow rate decreases further. And finally, a thermal runaway will occur.

Therefore, in order to prevent the above-described flow imbalance and thermal runaway, conventionally, a valve was provided at each He gas outlet of the two current lead wires to adjust the gas flow rate. However, in this method, since the positioning of the current lead is largely separated from the horizontally long cryogenic refrigerant container, it is difficult to adjust the valves if both valves are centrally controlled at the same timing and time.

In order to solve the above various problems at once, the present invention provides a partition layer for separating the left and right He liquids in the middle of a horizontally long cooling tank, and a valve for controlling two current lead wires is provided. It is an object of the present invention to provide a cryogenic refrigerant container that can be independently controlled.

[Means for Solving the Problems]

Therefore, in this invention, as a means for solving the above problems, a horizontally long cryogenic refrigerant container and a superconductor are provided inside the container, and gas cooling type current leads are provided at both ends of the cryogenic refrigerant container. The refrigerant vessel is divided into right and left, a partition tank having a superconductor penetrating therethrough is provided, and a control section for independently controlling the gas control valves of the current leads is adopted.

Generally, He is used as the refrigerant sealed in the cryogenic refrigerant container.
Liquid or nitrogen is used.

Further, it is preferable that the partition layer is generally provided at substantially the center of the cryogenic refrigerant container so that the amount of the refrigerant liquid by the partition wall can be evenly accommodated on the left and right.

[Action]

In the cryogenic refrigerant container according to the present invention configured as described above, the volume of the left and right refrigerant liquids can be made substantially equal by providing the partition wall at the substantially center of the cryogenic refrigerant container. In addition, the pressure on the left and right of the partition wall is separated, and the valves for gas control on the left and right can be controlled independently. Can be flushed.

〔Example〕

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

FIG. 1 is a schematic view of a preferred embodiment of a cryogenic refrigerant container according to the present invention.

Reference numeral 1 denotes a cryogenic refrigerant container (cryostat), particularly a horizontally long one. A heat insulating layer using a vacuum layer 2, a heat insulating material 3 and the like is simply shown inside the cryogenic refrigerant container 1, but the method of the heat insulating layer is not limited to this, and for example, a liquid N ₂ layer or the like (illustrated There are various methods such as a method in which (omitted) is provided, and any one of them may be adopted. 4 is He
It is a liquid.

Inside the heat insulation layer of the cryogenic refrigerant container 1, a partition wall layer 5 is provided in the vicinity of substantially the center of the cryogenic refrigerant container 1, whereby the cryogenic refrigerant container 1 is divided into left and right approximately equal volume parts. .

Reference numeral 6 is a superconductor, which penetrates the partition layer 5 as shown in the drawing. Therefore, the superconductor 6 is expected to be extremely long. The superconductor 6 is connected at both ends to a vertical conductor 6 ₁ (only the left side is shown) as shown, which is guided upwards through the gas cooling current lead 7 and
It is connected to 6 ₁ ′ and 6 ₂ ′. 7 ₁ and 7 ₂ are the upper ends of the current leads 7.

In addition, 8 ₁ and 8 ₂ are He liquid inlet valves.

Further, valves 9 ₁ and 9 ₂ are provided for the upper end portions 7 ₁ and 7 ₂ , and these are independently controlled by a control unit 10 described later.

FIG. 2 is a schematic block diagram of the control unit 10 that controls the valves 9 ₁ and 9 ₂ . (A) shows the control unit 10 in the case of the present invention, and (b) shows the conventional control unit 10 '. Of course, in the present invention, the valves 9 ₁ , 9 ₂ are controlled only by the one shown in FIG.
Are controlled independently of each other. 11a, 11b, 1
1'is a central processing unit CPU.

In the conventional example shown in (b), the two valves 9 ₁ and 9 ₂ were controlled at the same control amount at the same time, so the difference in He evaporation amount and thermal runaway due to this could not be prevented. It will be easily understood that the control shown in FIG.

〔effect〕

As described above in detail, in the present invention, the cryogenic refrigerant container is divided into two parts so that the pressure and the flow rate of the left and right cooling liquids can be independently controlled. It can be particularly effectively applied to a case where a superconductor is laid in a place where a long distance is provided between a bus wire duct, a power source and a motor.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment of a cryogenic refrigerant container according to the present invention, FIG. 2 is a block circuit diagram of its control unit, and FIG. 3 is a schematic diagram of an example of a conventional cryostat. 1 ... Cryogenic refrigerant container, 2 ... Vacuum layer, 3 ... Thermal insulation layer,
4 ... He, 5 ... Partition layer, 6 ... Superconductor, 7 ... Gas cooling current lead, 6 ₁ ', 6 ₂ ' ... Terminal, 9 ₁ , 9 ₂ ...... Valve, 10, 10 '... … Control unit.

Claims (3)

[Scope of utility model registration request] 1. An oblong cryogenic refrigerant container having a horizontally long shape and a superconductor inside the cryogenic refrigerant container. Gas-cooled current leads are provided at both ends of the cryogenic refrigerant container. A cryogenic refrigerant container comprising: a partition layer that penetrates through the container, and a control unit that independently controls the gas control valves of the current leads. 2. As a refrigerant enclosed in the cryogenic refrigerant container
The cryogenic refrigerant container according to claim 1, wherein He liquid is used. 3. The cryogenic refrigerant container according to claim 1, wherein the partition wall layer is provided substantially in the center of the cryogenic refrigerant container so that the partition wall can evenly store the amount of the refrigerant liquid. .