JPH0469560A - Sample container for thermal analysis - Google Patents

Abstract

PURPOSE:To prevent a sealed type sample container from breaking and exploding by forming a blind hole which does not penetrate the lid of the container to the outside inside the lid. CONSTITUTION:When the lid 4 is inserted into the opening part 1a of the container 1 to seal the container, a lid hole 2 as the blind hold is formed nearly at the center position of the surface inside the sample container. The resistance of this part to pressure from the inside is set lower than the sealing force between the container 1 and lid 4. Then this sealed type sample container for thermal analysis is installed in a thermal analyzing device and when the temperature in the sample container is raised, the sample 5 is vaporized and decomposed to raise the internal pressure in the sample container. When the internal pressure exceeds the pressure resistance limit of the hole 2, the bottom part of the hole 2 is broken to discharge the produced gas from the sample container, thereby preventing the internal pressure from rising. Consequently, the sample container is prevented from breaking and exploding to prevent the thermal analyzing device from damaging.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sample container for thermal analysis, particularly a sealed type.

[Summary of the invention]

The present invention aims to minimize explosion of the container due to increase in internal pressure due to decomposition or evaporation of the sample when the sample is placed in a sealed sample container in a thermal analyzer and heated to a high temperature for thermal analysis. This is the purpose. For this reason, by creating a hole inside the lid of the container that does not penetrate to the outside, the hole in the lid is destroyed by the pressure inside the container before the internal pressure of the container reaches the pressure limit of the sealed sample container. This sealed sample container for thermal analysis is characterized by having a safety mechanism that prevents an increase in internal pressure and prevents the sealed sample container from bursting or exploding.

[Conventional technology]

A conventionally used sealed sample container for thermal analysis of this type is disclosed in US Pat. No. 4,159,057, and has a structure as shown in FIG.

That is, a cylindrical container l having a bottom portion 1a on one side is
The other open portion 1b of the container has a stepped portion 1c concentric with the cylindrical shape on its inner diameter, and a tapered portion 1d on the side wall of the stepped portion. A sample 5 to be thermally analyzed is placed on the bottom 1a of the container 1. After inserting the sample 5 into the container, a truncated conical shaped 14 having an outer circumferential shape that is almost the same as the tapered shape of the tapered part 1d is inserted into the opening 1b of the container 1. Next, as shown in FIG. In addition, since the thickness of the lid 4 is thinner than the distance between the tip of the tapered portion and the stepped portion 1c, the inside of the container 1 is sealed by bending the tip of the opening 1b inward and crushing it. This was used as a sample for a thermal analyzer.

[Problem to be solved by the invention]

In the sealed sample container for thermal analysis shown in FIG. 2, the joint between the container 1 and the lid 4 has the lowest pressure resistance with respect to the internal pressure.
If a sealed sample container for thermal analysis containing sample 5 is installed in a thermal analyzer and heated, the seal may leak from the joint, or even the lid 4 may come off from the container l, causing an explosion. , which could damage the thermal analyzer.

[Means to solve the problem]

The present invention provides extremely effective means for quickly solving the above problems. The method is to create a blind hole (neck hole) inside the lid that does not penetrate to the outside to seal after inserting a sample into the container, and to apply pressure resistance of the remaining wall thickness of the hole in the lid to the joint between the lid and the container. This is to set the withstand voltage to be lower than the withstand voltage of .

[For production]

When a sealed thermal analysis sample container with the above structure containing a sample is installed in a thermal analysis device and the sealed thermal analysis sample container is heated for thermal analysis, the internal pressure inside the sample container generally increases as the temperature rises. Rise. At this time, the part with the weakest pressure resistance against the internal pressure inside the sample container is the thin part at the bottom of the hole provided in the lid of the sample container, so this part ruptures due to the internal pressure.
This causes the sample container to leak. In other words, the internal pressure stops rising, and the joint between the container and the lid does not break.

Furthermore, by making the thin wall portion (remaining wall W-) at the bottom of the hole constant, the pressure resistance of each sample container can be made constant.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention.

1 is a container, 1a is a bottom part, 1b is an open part, IC is a stepped part, 1d is a tapered part, and 5 is a sample placed inside the container 1 to be thermally analyzed. 4 is a lid, and the lid 4 is a container l
The container 1 is sealed by inserting the container 1 into the open portion 1a and bending the tip of the tapered portion 1d. The above is the same as the conventional sealed sample container for thermal analysis described above. The difference from the conventional example is the shape of the lid 4. When inserting the lid 4 into the open part 1a of the container 1 and sealing it, a neck hole, which is a blind hole, is provided to provide a thinner part with respect to the plate thickness of M] at approximately the center of the inner surface of the sample container. 2 will be provided. That is, a hole 2 that does not penetrate to the outside is provided inside the lid. Here, since the hole 2 is a blind hole, the bottom of the hole 2 of the lid 4 has a thin remaining wall thickness, and a thin portion exists at the bottom of the hole 2. This thickness can be adjusted to any desired thickness by adjusting the depth of the hole 2. Container 1 and M
Set the sealing force to be weaker than that of 4.

Next, when the sealed sample container for thermal analysis as described above is placed in a thermal analysis device and the temperature of the sample container is increased, sample 5 evaporates and decomposes, causing the internal pressure inside the sample container to increase. Rise. When the internal pressure exceeds the withstand pressure limit of the hole 2, the thin walled portion at the bottom of the hole 2 breaks, and the generated gas inside the sample container is released to the outside, thereby preventing the internal pressure from increasing. It also prevents the sample container from exploding.

〔Effect of the invention〕

According to the present invention, when using a sealed sample container for thermal analysis,
This prevents the sample container from bursting or exploding inside the thermal analyzer, thereby preventing injury to the thermal analyzer.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional container and lid, and FIG. 3 is a sectional view of a conventional container and lid installed. It is a diagram. 1... Container 1a... Bottom part 1b... Open part IC... Step part 1d... Taper part 2... Hole 4... Lid, sample or more

Claims (1)

[Claims] A cylindrical container having a bottom on one side, an opening having a tapered portion formed on the top of the container, a truncated conical lid pushed into the opening, and an outer side formed on the inside of the lid. A sealed sample container for thermal analysis characterized by comprising a hole that does not penetrate through the hole.