JPH0515979B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a temperature testing device using a cryogenic refrigerator, and in particular, to a temperature testing device that uses a cryogenic refrigerator to conduct a test by placing a sample in a temperature range from a cryogenic state to a high temperature state. The present invention relates to a cryogenic testing device designed to

<<Prior Art>> A conventional cryogenic testing device using a cryogenic refrigerator places the output part of the cryogenic refrigerator and the sample supporting part in a vacuum chamber, and the output part of the cryogenic refrigerator and the sample supporting part are supported by the cryogenic refrigerator. By connecting the sample with a flexible thermally conductive material, the sample can be cooled from room temperature (300K) to extremely low temperature (10K). A heater was arranged to maintain the sample at a constant temperature within a predetermined temperature range and conduct the test.

In this case, the materials and structure of the components of the refrigerator are selected based on the low temperature, so in the case of cryogenic refrigerators, problems with the heat resistance of the component materials and the effects of thermal expansion appear when the temperature reaches approximately 340K. This may cause the refrigerator to become inoperable or cause damage to the refrigerator.

Conventionally, in order to prevent heat from being transferred from the sample side to the refrigerator side due to incorrect operation, etc. and causing the temperature of the refrigerator to rise, a heat transfer material with a small amount of heat transfer (for example, a 0.5 mm diameter copper wire bundle) was used to The section was connected to the output section of the refrigerator.

≪Problem to be solved≫ However, when the output part of the refrigerator and the sample are connected using a heat transfer material with a small amount of heat transfer,
There was a problem in that the heat transfer efficiency during cooling was poor, not only did it take a long time to obtain the target temperature, but also the freezing capacity of the refrigerator could not be used effectively.

Furthermore, when the amount of heat transfer is increased, there is a problem that when high heat from the sample side is transferred to the refrigerator, the temperature of the refrigerator rapidly rises and is damaged.

≪Means for Solving the Problems≫ The present invention makes it possible to effectively utilize the freezing capacity of the refrigerator while preventing high heat from the sample side from being transmitted to the refrigerator. In the middle of the heat transfer path that connects the output part of the machine and the sample, use a material that has high thermal conductivity at low temperatures and low thermal conductivity at high temperatures (e.g. sapphire material).
A heat transfer control body consisting of the above is disposed, and a low melting point metal such as wood metal is interposed between the heat transfer control body and the output section of the refrigerator.

<<Operation>> In the present invention, a material (such as sapphire material) that has high thermal conductivity at low temperatures and low thermal conductivity at high temperatures is used in the heat transfer path connecting the output part of the refrigerator and the sample. A heat transfer control body is arranged,
Since a low melting point metal such as wood metal is interposed between this heat transfer control body and the output part of the refrigerator, heat transfer is efficient when cooling the sample where the amount of heat absorbed by the refrigerator is greater than the amount of heat input from the heater. However, if the refrigerator stops operating or an abnormality occurs in the equipment and high heat from the sample side attempts to flow to the refrigerator, the heat transfer control body will restrict heat transfer. , the temperature of the refrigerator will not rise. Furthermore, when the heat flowing from the sample side to the refrigerator side reaches a certain temperature or higher, the low melting point metal melts and blocks the heat from flowing into the refrigerator, thereby preventing damage to the refrigerator due to high heat.

≪Example≫ The drawings show examples of the present invention, in which Fig. 1 is a schematic diagram of the cryogenic test equipment, Fig. 2 is an enlarged view of part A in Fig. 1, and Fig. 3 is an enlarged view of part B in Fig. 1. It is.

In the figure, 1 is a cryogenic refrigerator, 2 is a temperature testing device, and the output section 3 of the cryogenic refrigerator 1 and the sample 4 held at the bottom of the temperature testing device 2 are connected to a vacuum chamber 5.
They are connected by a heat conductive material 6 inside.

The thermally conductive material 6 is made of a flexible thermally conductive material (for example, copper or aluminum), and a heat transfer restrictor 7 is provided in the middle thereof.

The heat transfer regulator 7 is a heat transfer controller 8 made of a material such as sapphire material that has low thermal conductivity at high temperatures but high thermal conductivity at low temperatures.
and a low melting point metal 9 such as wood metal, and the low melting point metal 9 in which the tip of the thermally conductive material 6a led out from the output section 3 of the refrigerator 1 is embedded is fixed to the casing 10, By crimping and fixing the rod-shaped heat transfer control body 8 to the casing 10 made of a good thermal conductor with fixing screws 11,
The refrigerator side heat conductive material 6a and the heat transfer control body 8 are connected via a low melting point metal 9 and a casing 10 so as to be heat conductive. A molten metal outflow hole 12 is formed at the bottom of the low melting point metal holding portion in the casing 10 of the heat transfer regulator 7.

The heat transfer control body 8 and the sample 4 are the sample side heat conductive material 6b.
are connected. In addition, a sample temperature control heater 13 is arranged in the sample holding section of the temperature test device 2, so that the sample 4 held in the sample holding section and sealed inside the temperature test device 2 can be heated. It is configured.

In addition, the heat conductive material 6 in the output section 3 of the refrigerator 1
As shown in FIG. 3, the connection is made with the mounting bolts 1 while the refrigerator side end of the refrigerator side heat conductive material 6a is sandwiched between the indium plate 14 and the low melting point metal plate 15.
6 is fixed to the output section 3.

In addition, also in the connection part of the output part 3 of this refrigerator 1 and the thermal conductive material 6, the end part of the thermal conductive material 6 may be made to be buried in a low melting point metal.

In the cryogenic test apparatus having the above configuration, a heat transfer control body 8 is provided in the middle of the heat transfer path connecting the output section 3 of the refrigerator 1 and the sample 4, which becomes a thermal resistor at high temperatures and a good thermal conductor at low temperatures. Since the low melting point metal 9 is interposed, the cryogenic refrigerator 1 is operated,
When cooling the sample 4, the freezing capacity of the cryogenic refrigerator 1 can be effectively used to cool the sample 4 powerfully and quickly. Even if the sample 4 reaches a high temperature when an abnormality occurs or during a high-temperature test, the heat transfer control body 8 is used as a heat resistor, so the high temperature will not be transmitted to the cryogenic refrigerator 1 side. In addition, if the temperature in the heat transfer regulating part reaches the melting point of the low melting point metal (for example 343K), the low melting point metal will melt down and the heat transfer path between the sample 4 and the refrigerator 1 will be cut off, so cryogenic freezing The machine 1 is no longer exposed to high temperatures and can be prevented from being damaged by heat. Even if the sample 4 becomes high temperature, the heat is not transferred to the cryogenic refrigerator 1, so the temperature of the sample 4 is raised by the temperature control heater 13 regardless of the operating state of the refrigerator 1. and temperature tests can be performed in the temperature range of 10K to 600K.

<<Effects>> In the present invention, a heat transfer control body made of a material that has high thermal conductivity at low temperatures and low thermal conductivity at high temperatures is installed in the middle of the heat transfer path connecting the output part of the refrigerator and the sample. , and a low melting point metal is interposed between this heat transfer control body and the refrigerator output section.
Although heat transfer can be performed efficiently when cooling the sample where the amount of heat absorbed by the refrigerator is greater than the amount of heat input from the heater, the high heat from the sample side can be frozen when the refrigerator stops operating or an abnormality occurs in the equipment. When the heat tries to flow toward the machine, the heat transfer control body restricts the heat transfer, and the temperature of the refrigerator does not rise.

Furthermore, when the heat flowing from the sample side to the refrigerator side reaches a certain temperature or higher, the low melting point metal melts and prevents heat from flowing into the refrigerator.

As a result, in the present invention, the freezing capacity of the refrigerator can be used effectively, but even if the sample becomes hot during a high temperature test or when an abnormality occurs, it is possible to prevent the refrigerator from being damaged by high temperatures. No cryogenic testing equipment can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a cryogenic testing apparatus, FIG. 2 is an enlarged view of section A in FIG. 1, and FIG. 3 is an enlarged view of section B in FIG. 1. 1... Cryogenic refrigerator, 3... Output section of 1, 4...
...Sample, 6...Heat transfer material, 8...Heat transfer control body, 9
...Low melting point metal.

Claims (1)

[Claims] 1. In a cryogenic test device in which the output part of a cryogenic refrigerator and a sample are connected by a heat transfer material made of a flexible thermal conductor, the thermal conductivity increases at low temperatures; It is characterized in that a heat transfer control body made of a material that sometimes has low thermal conductivity is placed in the heat transfer path, and a low melting point metal is interposed between the heat transfer control body and the output section of the refrigerator. Cryogenic testing equipment. 2. The cryogenic testing device according to claim 1, wherein the heat transfer control body is made of sapphire material. 3. The cryogenic testing device according to claim 1 or 2, wherein the low melting point metal is wood metal. 4. Any one of claims 1 to 3, in which the low melting point metal is disposed at the connection part between the heat transfer material and the heat transfer control body that connects the output part of the refrigerator and the heat transfer control body. Cryogenic test equipment described in paragraph 1. 5 Claims 1 to 4 in which the low melting point metal is arranged at the connection part between the output part of the refrigerator and the heat transfer control body
Cryogenic test equipment as described in any one of the following paragraphs.