JPH0114939Y2 - - Google Patents

Description

[Detailed explanation of the invention] Conventionally, a liquid helium container and a measuring instrument were connected with a gate-shaped insulated pipe, and liquid helium was sent into the measuring instrument to cool the measuring part and measure its performance at low temperatures. However, if the connection is improper or if the operation is inexperienced, the loss of liquid helium becomes noticeable and the liquid helium is wasted.

However, since liquid helium is very expensive, when it is used in experiments at universities, etc., it results in a large amount of experiment costs being wasted.

The present application was devised in view of these drawbacks, and allows liquid helium to be used effectively without waste.
This invention relates to a cryostat for measuring the performance of electrical components that is extremely easy to operate.

Now, to explain an embodiment to achieve this purpose, the overall configuration is such that a heat-insulating large-diameter measuring tube 2 is provided at the top of a heat-insulating insertion pipe 1, and the lower end is placed from the top of the large-diameter measuring tube 2. A support that allows a pipe 4 provided with a sample insertion tube 3 to be inserted, an evaporated helium gas discharge pipe 5 to be attached to the upper end of the pipe 4, and an upper portion of the measurement tube 2 to be airtightly connected to the upper portion of the discharge pipe 5. The upper part of the tube 6 is airtightly fixed, and a connector 6b such as a conductive wire for connecting to a measuring instrument is attached to the side surface of the support tube 6.

The heat-insulating insertion pipe 1 is a double inner and outer pipe 1a.
and an outer pipe 1b, the inner pipe 1a protrudes downward longer than the outer pipe, the lower end of the outer pipe 1b is airtightly connected and closed to the inner pipe 1a, and the lower end of the reducer 7 is airtightly connected and fixed to the upper end. ing. A measuring tube 2 is airtightly connected to the large diameter portion of the upper end of the reducer 7, and a flange 9 having a cylindrical portion 8 for inserting a sample facing upward is fixed to the upper end of the measuring tube 2 in an airtight manner. A horizontal flange 10 facing outward is provided at the upper end of the supporting cylinder 6, which will be described later.
It is formed so that it can be airtightly connected to the flange 6a at the lower end of the flange 6a.

In addition, in the measuring tube 2, a pipe 11 of a size that can sufficiently insert the sample insertion tube 3 is airtight between the disk 1a-1 at the lower end of the inner pipe 1a and the flange 9 at the upper end of the measuring tube 2. It is installed.

The measuring tube 2 is formed in this way, and vacuum insulation is provided between the inner pipe 1a and the outer pipe 1b, between the measuring tube 2 and the pipe 11, etc.

Separately, a small-diameter pipe 4 is fixed to the upper end surface 3c of a hollow sample insertion tube 3 whose lower part is closed off 3a and whose upper side surface is provided with a ventilation hole 3b.

A pipe 5 having a slightly larger diameter than the pipe 4 is fixed to the upper end of the pipe 4, and two holes 5a are bored near the bottom of the pipe 5.

The upper end of the pipe 5 is open, and the upper end of the support tube 6 is airtightly fixed near the top of the pipe 5.
A flange 6a having the same diameter as the flange 10 is attached to the lower end of the flange 6a.
In addition, a horizontal cylinder 6c having a connector 6b is provided at one location on the side surface of the support cylinder 6.

12 is a vacuum sealing valve provided in the measuring cylinder 2.

13 indicates a liquid helium container.

In the present application, after inserting a sample such as an electrical component into the sample insertion tube 3 with the above-mentioned configuration, the sample insertion tube 3 is inserted into the pipe 11, and then the flange 1 of the cylindrical portion 8
0 and the flange 6a of the support cylinder 6 are airtightly fixed and prepared.

After that, insert the heat-insulating insertion pipe 1 into the mouth part 13a of the liquid helium container 13, and then insert the pipe 2 and the mouth part 1.
3a is airtightly supported, the liquid helium container 13
The liquid helium is vaporized and the pressure increases due to the conduction heat (intrusion heat) transmitted to the liquid helium container or the heater installed in the liquid helium container.
a, enter the pipe 11, and insert the sample inner cylinder 3.
The cooled and vaporized helium gas is exhausted to the outside through the pipe 11, the hole 5a, and the pipe 5.

Then, the performance at low temperatures due to cooling of the sample is measured using an external measuring device via a conductive wire or the like.

In the present application, since the insulating insertion pipe 1 is simply inserted into the mouth 13a of the liquid helium container 13 from above, the work is simple, and the airtightness between the mouth 13a and the pipe 1 can be easily achieved, so there is no waste of time. Therefore, since there is no need to replace the liquid helium, there is little vaporization of the liquid helium, and the expensive liquid helium can be used effectively.

As described above, in this application, an insulating large-diameter measurement tube 2 is provided at the top of a heat-insulating insertion pipe 1, and a pipe 4 with a sample insertion tube 3 provided at the lower end of the large-diameter measurement tube 2 is inserted. Then, an evaporated helium gas release pipe 5 is attached to the upper end of the pipe 4, and the upper part of a support cylinder 6, which can be airtightly connected to the upper part of the measuring cylinder 2, is fixed onto the discharge pipe 5, and the support cylinder Connector 6b for connecting a conductor or the like to the measuring instrument on the side of 6
Since the operation is simple and the operation time is short, only a small amount of vaporization is required when exchanging expensive liquid helium, so liquid helium or low-temperature helium gas can be reliably and sufficiently applied to the desired part of the sample. It not only helps to save test costs by minimizing wasteful vaporization of liquid helium, but also allows easy and quick handling due to its simple configuration. It has the following.

[Brief explanation of drawings]

FIG. 1 is an overall cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a side view showing the state of use.

Claims (1)

[Scope of utility model registration request] A large-diameter heat-insulating measuring tube 2 is provided at the top of the heat-insulating insertion pipe 1, and a pipe 4 with a sample insertion tube 3 provided at the lower end of the large-diameter measuring tube 2 is inserted into the upper end of the pipe 4. The evaporated helium gas discharge pipe 5 is attached, and the upper part of the support tube 6 which can be airtightly connected to the upper part of the measurement tube 2 is fixed to the upper part of the discharge pipe 5. A cryostat equipped with a connector 6b for connecting conducting wires, etc.