JPH0451445Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a cryogen injection structure for a cryostat that insulates and houses a cryogenic liquid cryogen.

[Conventional technology]

Fig. 3 shows a conventional cryostat shown in, for example, Japanese Utility Model Application Publication No. 60-78111. In the figure, 1 is an inner tank which is a cryogenic liquid cryogen storage tank, 2 is an outer tank, and 3 is a cryogen injection pipe. , 4 is an exhaust pipe for the evaporated liquid cryogen, 5 is a cryogenic liquid cryogen contained therein, 6 is a superconducting electromagnet cooled by the cryogenic liquid cryogen, 7
8 is a container for storing a cryogenic liquid cryogen, 8 is a transfer pipe for transferring the cryogenic liquid cryogen from the cryogenic liquid cryogen container to the cryogenic container, and 9 is a transfer pipe 8.
This is a port pipe that guides and holds the liquid injection pipe 3 and connects to the liquid injection pipe 3.

Next, the operation will be explained. The inner tank 1 and the outer tank 2 are combined to form a kind of thermos bottle, and the space between them is vacuum insulated. The cryogenic liquid cryogen 5 contained in the inner tank 1 is stored in a storage container 7
From there, it is sent into the inner tank 1 through the transfer pipe 8, the port pipe 9, and the liquid injection pipe 3. The cryogenic liquid cryogen that has evaporated due to inflow heat from the outside, minute heat generation from the superconducting electromagnet 6 housed in the inner tank 1, etc. is exhausted to the outside from the exhaust pipe 4.

[Problem that the invention attempts to solve]

In the conventional cryostat mentioned above, the room temperature side and the cryogenic side are connected through the storage container transfer pipe and liquid injection pipe, so excess heat from the outside flows into the cryogenic liquid cryogen, and the There was a problem in that the evaporation rate of the cryogenic cryogen increased, and the time that the superconducting coil could be operated with one storage of the cryogenic cryogen became shorter.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a cryostat that can minimize heat intrusion from the outside.

[Means for solving problems]

In the cryostat according to this invention, the upper end of the introduction part is made to protrude from the liquid level of the cryogenic cryogen contained in the container, and is separated and disposed coaxially with the port part, and the upper end of the introduction part A receiving tray is provided on which the tip of the transfer tube is pressed when the transfer tube is attached.

[Effect]

The function of this design is that when the superconducting coil is in operation, the introduction part protrudes from the liquid level of the cryogenic cryogen, and heat conduction from the normal temperature part to the cryogenic part is carried out without direct connection to the port pipe that fixes the transfer pipe. The path is blocked, minimizing heat ingress into the cryogen and minimizing the amount of cryogen evaporation.

〔Example〕

FIG. 1 shows a cryostat showing an embodiment of this invention.
is the same as the conventional one. 10 is a port pipe, 1
Reference numeral 1 designates a transfer tube receiving tray provided at the upper end of a liquid injection tube 3 whose upper end protrudes from the liquid surface of the cryogenic cryogen 5 .

The operation of this invention will be explained. In FIG. 1, the cryogenic liquid cryogen is injected into the inner tank 1 from the storage container 7 through the transfer pipe port pipe 9 of 8, the transfer pipe receptacle 10, and the injection pipe 3.

When operating the superconducting coil 6 after the injection of the cryogenic cryogen 5 is completed and when holding the cryogenic cryogen 5, the transfer pipe 8 is removed and the port pipe 10 is separated from the liquid injection pipe 3 as shown in the figure. Therefore, no extra heat flows into the cryogenic cryogen 5 from the normal temperature side, and therefore the evaporation rate of the cryogenic cryogen 5 is reduced, and the operation of the superconducting coil 6 with one storage of the cryogenic cryogen 5 is reduced. It will be extended.

In the above embodiment, a case was explained in which the superconducting coil is housed in the inner tank, but as shown in FIG. It has the same effect as the example.

[Effect of idea]

As described above, according to this invention, the upper end of the introduction part is made to protrude from the liquid level of the cryogenic cryogen contained in the container, and is separated and disposed coaxially with the port part, and At the top of the introduction section, there is a tray against which the tip of the transfer tube is pressed when the transfer tube is installed, making it possible to cut off the excess heat that conventionally flows from the room temperature side to the cryogenic side through the port tube and liquid injection tube. This has the effect of reducing unnecessary evaporation of the cryogenic cryogen.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a cryostat according to an embodiment of this invention, Fig. 2 is a longitudinal sectional view of a cryostat showing another embodiment of this invention, and Fig. 3 is a longitudinal sectional view showing a conventional cryostat. be. In the figure, 3 is a liquid injection pipe, 5 is a cryogenic cryogen, and 8 is
1 is a transfer pipe, 10 is a port pipe, and 11 is a transfer pipe receiver.
In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A transfer pipe provided in a container containing a cryogenic cryogen for transferring the cryogenic cryogen from the outside to the container, and for attaching and guiding the transfer pipe to the container. and an introduction part for guiding the cryogenic cryogen sent from the transfer pipe to the lower part of the container, the upper end of the introduction part being connected to the cryogen contained in the container. A saucer is provided at the upper end of the introduction part, and is protruded from the liquid surface of the pipe and is separated from the port part while remaining coaxial with the port part, and is provided with a saucer against which the tip of the transfer pipe is pressed when the transfer pipe is attached. cryostat. (2) A cryostat according to claim 1 of the utility model registration claim, characterized in that a superconducting coil is housed in a cryogenic container.