JPH0634832Y2 - Superconductor sorting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for selecting superconductors from non-superconductors, which is a general method for confirming superconductors. The present invention relates to a device capable of simple and continuous selection by utilizing the effect that a superconductor completely eliminates a magnetic field when it is cooled to a temperature equal to or lower than that, and exhibits complete diamagnetism.

[Prior Art and its Problems] Generally, oxide superconductors are known to have high critical temperature, critical magnetic field, and critical current, but oxide superconductors are powdered or coprecipitated from various raw materials. In the case of manufacturing in, the 100% of the manufactured product does not become a superconductor, but it contains approximately several 10% of impurities and non-superconductors. When the superconductor containing these impurities and the non-superconductor is processed into a wire,
Due to the influence of impurities and non-superconductors, the deterioration of the characteristics of the processed superconductor member cannot be avoided.

Conventionally, a method of selecting superconductors and non-superconductors by utilizing the Meissner effect is known, but since there is no continuous sorting device with a simple and high economic effect, they are sorted after the superconductors are manufactured. Without being used, it is used as a superconductor processed member while containing impurities or non-superconductors, making it difficult to realize a superconductor with high characteristics. The present invention has been made in view of the above circumstances, and is an apparatus for easily and continuously selecting superconductors from a selection sample composed of superconductors and non-superconductors by utilizing the Meissner effect peculiar to superconductors. For the purpose of provision.

[Means for Solving Problems] A sorting apparatus of the present invention comprises an introduction pipe, a discharge pipe provided in communication with the introduction pipe, and a branch pipe provided so as to branch from the middle of the introduction pipe. And a liquid transporting device for flowing a liquid refrigerant, which is connected to the inflow port of the introduction pipe, is connected to the inflow port of the introduction pipe, and is a selection sample consisting of a superconductor and a non-superconductor on the side of the branch pipe and the discharge pipe. A magnet provided outside the branch portion of the sorting pipe to exert a stronger magnetic field on the discharge pipe side of the branch portion than on the branch pipe side; and a superconductor collector connected to the outlet of the branch pipe. And a non-superconductor collector connected to the outlet of the discharge pipe, the strength of the magnetic field applied to the discharge pipe side by the magnet is due to the Meissner effect of the superconductor flowing with the liquid refrigerant. Strong to suppress the movement of the superconductor to the discharge pipe side It has been set to.

Hereinafter, the present invention will be described in detail.

FIG. 1 shows an example of the sorting apparatus of the present invention.

In the figure, reference numeral 1 is a Y-shaped tube (selection tube) for selecting superconductors and non-superconductors in the selected sample. In this Y-shaped tube (selection tube) 1, the selected sample is the critical point of the superconductor. A flowing refrigerant 2 for cooling below the temperature to disperse and transport the sorted sample is flowed.

Since the Y-shaped tube 1 causes the flowing refrigerant 2 to flow in the tube, it is preferably made of low-temperature steel such as 9% Ni steel or 18-8 stainless steel. The flowing refrigerant 2 is below the critical temperature of the superconductor. It is a substance that can realize the above temperature, and liquid helium, liquid nitrogen, etc. can be used depending on the critical temperature of the superconductor in the selected sample. The Y-tube 1 is fixed vertically to the direction of gravity,
It is composed of a straight pipe (introduction pipe) 5, a discharge pipe 10 communicating with the straight pipe 5 so as to be in a straight line, and a branch pipe 3 branched from the middle of the straight pipe 5, and its shape. The branch pipe 3 branches at an angle θ with respect to the straight pipe 5 at the branch point 4, and the branch pipe 3 is bent so as to be parallel to the discharge pipe 10 in the middle thereof.

In addition, the Y-shaped tube 1 has the flowing refrigerant 2 in advance in order to avoid bumping when the flowing refrigerant 2 flows into the Y-shaped tube 1.
Must be cooled to the same temperature as.

In order to efficiently select the superconductor in the selected sample,
The diameter of the Y-shaped tube 1 and the flow velocity of the flowing refrigerant 2 should be set so that the flow of the flowing refrigerant 2 is as close to a laminar flow as possible. That is, the diameter of the Y-shaped tube 1 is set sufficiently larger than the flow velocity of the flowing refrigerant 2 or the flowing refrigerant 2
It is necessary to set the flow velocity of 1 as low as possible. Also,
Regarding the length of the Y-shaped tube, it should not be set longer than necessary in order to keep the temperature of the flowing refrigerant 2 constant.
The angle θ of the branch of the character tube 1 is 90 ° or less, preferably 20
It is between 0 ° and 60 ° inclusive.

A liquid transport device 6 is connected to the inlet of the Y-shaped pipe 1, a superconductor collector 7 is provided at the outlet of the branch pipe 3, and a non-superconductor collector is provided at the outlet of the discharge pipe 10. 8 is connected. It is desirable to use a rotary pump or an axial pump that does not cause a pulsating flow in the liquid as the liquid transport device 6.

Outside the branch point 4 of the Y-shaped tube 1, a magnet 9 for selecting the superconductor by causing the superconductor in the sample to be selected to have a Meissner effect on the side of the discharge pipe 10 is installed. Magnet 9
May be a permanent magnet or an electromagnet, but when the particle size of the sorted sample is small and the magnetic force of the magnet 9 is larger than necessary, the Meissner effect received by the superconductor in the sorted sample becomes too large and the superconductor flows through the flowing refrigerant 2. If the magnetic force of the magnet 9 is too small and the selected sample has a large particle size, the force of counteracting the force of the flow of the flowing refrigerant 2 floats at the branch point 4 and the magnetic force of the magnet 9 becomes too small. Flow through without being selected, the magnetic field strength of the magnet 9 should be selected according to the particle size of the sample to be selected and the flow velocity of the flowing refrigerant 2, and the direction of the magnetic line of force of the magnet 9 is the diameter of the Y-tube. Must be perpendicular to the direction. Such lines of magnetic force can be generated by passing a direct current through a linear conductor, for example, a copper wire, at a right angle to the branch point 4 of the Y-shaped tube 1. The direction of the flow of this direct current flows from the back side of the paper surface to the front side in FIG. 1, but in the opposite direction from the front side to the back side of the paper surface, even if the direction of the generated magnetic lines is opposite, I don't care.

Next, a sorting operation using this sorting apparatus will be described.

The selected sample crushed to an appropriate particle size according to the processing step after manufacturing is dispersed in the flowing refrigerant 2, and is supplied to the inlet of the Y-shaped tube 1 by the liquid transport device 6.

The selected sample is cooled to the critical temperature of the superconductor while flowing in the Y-tube 1 by the flowing refrigerant 2. When the superconductor in the cooled sorted sample reaches the Y-shaped tube branch point 4, the flow path is changed by the Meissner effect of the magnet 9 installed on the side portion of the Y-shaped tube 1, and the magnetic line of force of the magnet 9 is changed. It flows along the Y-shaped branch pipe 3 and is collected by the collector 7 connected to the outlet of the branch pipe 3 to be a raw material for a superconductor processed member.

On the other hand, since the non-superconductor is not affected by the magnet 9 installed at the branch point 4 of the Y-shaped tube 1, the non-superconductor continues to flow without changing the flow direction, and the straight tube 5 of the Y-shaped tube 1 is exhausted. It is collected in a collector 8 connected to the outlet of the discharge pipe 10 through 10.

[Example] Y ₂ O ₃ , BaCO ₃ , and CuO powder were mixed and treated at 920 ° C.
-Ba-Cu-O-based superconductor and non-superconductor mixed powder 30
g, prepared as a selection sample, and dispersed in the flowing refrigerant 2.
Liquid nitrogen, which can realize a temperature lower than the critical temperature of the Y-Ba-Cu-O-based superconductor, was used as the flowing refrigerant 2. A rotary pump is used as a liquid transporting device for the fluidized refrigerant 2 in which the sorted sample is dispersed, and it is made of 9% Ni steel and has a diameter of 1 cm, a length of 100 cm, a branch point A is 50 cm from the inlet, and a branch pipe 3 and a straight pipe 5 are provided. The angle θ formed was 60 degrees, and the Y-shaped tube 1 flowed in through the inlet.

As a magnet 9 for producing the Meissner effect, a copper wire having a diameter of 5 cm is attached to the outside of the branch point 4 of the Y-shaped tube 1 and 250
Screening was performed using a magnetic field generated by passing a current of 00A.

After 4 minutes from the flow of the selected sample into the Y-shaped tube 1, 20 g of the selected superconductor was collected in the collector 7 connected to the branch pipe 3, and 10 g of the non-superconductor was collected in the collector 8.

As a result of manufacturing various superconductor processed members using the superconductor powder collected in the collector 7 and conducting various tests, the critical temperature, the critical magnetic field, and the critical magnetic field are higher than those obtained when unsorted superconductor powder is used. The characteristics were improved at the current.

[Advantages of the Invention] As described above, the superconductor sorting apparatus of the present invention is provided with a sorting pipe having an introduction pipe, a discharge pipe, and a branch pipe, and connected to the inlet of the introduction pipe through the introduction pipe. And a liquid transport device for flowing a liquid refrigerant into a branch pipe and a discharge pipe side, the sample being composed of a superconductor and a non-superconductor, and a discharge pipe side of the branch portion provided outside the branch portion of the sort pipe. A magnet for exerting a stronger magnetic field than the side of the branch pipe, a collector of the superconductor connected to the outlet of the branch pipe, and a non-superconductor collector connected to the outlet of the discharge pipe. Tena,
The strength of the magnetic field applied to the discharge pipe side by the magnet is set to the strength that suppresses the movement of the superconductor to the discharge pipe side due to the Meissner effect of the superconductor flowing with the liquid refrigerant. The superconductor moving in the introduction pipe can be caused to flow into the branch pipe side by utilizing the Meissner effect, and the non-superconductor can be caused to flow into the discharge pipe side.The non-superconductor and the superconductor can be utilized by utilizing the Meissner effect. It is possible to select easily and continuously.

Therefore, according to the device of the present invention, when processing a superconductor, it is possible to easily and continuously perform the separation between the non-superconductor and the superconductor as a pretreatment, and it is expected that the characteristics of the processed superconductor member will be improved. it can.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a superconductor selecting device of the present invention. 1 ... Y-shaped pipe (selection pipe), 2 ... fluid refrigerant, 3 ... branching pipe, 4 ... branch point, 5 ... straight pipe (introduction pipe), 6 ... liquid transport device, 7 ... superconductivity Body collector, 8 ... Non-superconductor collector, 9 ... Magnet, 10 ... Discharge pipe.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Shoichi Hasegawa 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. (72) Masayuki Tan 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (56) Reference JP-A-63-302966 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A selection pipe comprising an introduction pipe, a discharge pipe provided in communication with the introduction pipe, and a branch pipe provided so as to branch from the middle of the introduction pipe, and a flow of the introduction pipe. A liquid transporting device which is connected to the inlet and flows a liquid refrigerant into a branched sample and a discharge pipe through a introducing pipe into a branch pipe and a discharge pipe, and a liquid transport device which is provided outside the branch portion of the sorting pipe. A magnet for exerting a stronger magnetic field on the discharge pipe side of the lever branch than the branch pipe side, a superconductor collector connected to the outlet of the branch pipe, and a non-contact connected to the outlet of the discharge pipe. A superconductor collector, wherein the strength of the magnetic field applied to the discharge pipe side by the magnet suppresses the movement of the superconductor to the discharge pipe side due to the Meissner effect of the superconductor flowing with the liquid refrigerant. Of a superconductor characterized by being set to Sorter.