JP2909920B2 - Sample container for thermal analysis - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sample container for thermal analysis, particularly to a sealed type.

[Summary of the Invention]

The present invention is intended to minimize the explosion of a container due to an increase in internal pressure due to decomposition or evaporation of a sample when a sample is placed in a sealed sample container at a high temperature and subjected to thermal analysis by a thermal analyzer. It is the purpose. For this reason, a hole that does not penetrate outside is provided inside the lid of the container, and before the internal pressure of the container reaches the pressure resistance limit of the sealed sample container, the hole of the lid is broken by the pressure in the container. The sealed sample container for thermal analysis is characterized by having a safety mechanism for preventing a rise in internal pressure and preventing rupture and explosion of the sealed sample container.

[Conventional technology]

A conventional sample container of this type used for a sealed thermal analysis is as disclosed in U.S. Pat. No. 4,159,057, which has a structure as shown in FIG.

That is, the cylindrical container 1 having the bottom 1a on one side is
The other open portion 1b of the container has a step 1c concentric with the cylindrical shape at the inner diameter and a tapered portion 1d at the side wall of the step. A sample 5 to be subjected to thermal analysis is placed on the bottom 1a of the container 1. After the sample 5 is inserted into the container 1, a frustoconical lid 4 having an outer peripheral shape substantially the same as the tapered shape of the tapered portion 1 d is inserted into the opening 1 b of the container 1. Next, as shown in FIG. 3, since the thickness of the lid 4 is thinner than the distance between the tip of the tapered portion and the step 1c, the tip of the opening 1b is bent inward and crushed, whereby the container 1 is crushed. Seal the inside of the. This was used as a sample for the thermal analyzer.

[Problems to be solved by the invention]

In the hermetically sealed sample container for thermal analysis shown in FIG. 2, the junction between the container 1 and the lid 4 has the lowest pressure resistance against the internal pressure. This is because, when a hermetically sealed sample container containing a sample 5 for thermal analysis is installed in a thermal analyzer and heated, a leak may occur at the joint or the lid 4 may come off from the container 1. An explosion could occur, damaging the thermal analyzer.

[Means for solving the problem]

The present invention provides an extremely effective means for quickly solving the above problems. The means is to provide a blind hole (lid hole) that does not penetrate to the outside inside the lid for sealing after inserting the sample into the container, and to determine the pressure resistance of the remaining wall thickness of the hole of the lid, the joint between the lid and the container. Is set so that the breakdown voltage is lower than the breakdown voltage.

(Operation)

When the hermetically sealed sample container for thermal analysis with the above-mentioned structure is placed in the thermal analyzer and the sealed sample container for thermal analysis is heated for thermal analysis, the internal pressure in the sample container generally increases as the temperature rises. Rise. At this time, the weakest pressure against the internal pressure in the sample container is the thin portion at the bottom of the hole provided in the lid of the sample container. Cause That is, the internal pressure rise stops, and the joint between the container and the lid does not break. Also, by making the thin portion (remaining thickness) 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 one embodiment of the present invention. Reference numeral 1 denotes a container, 1a denotes a bottom portion, 1b denotes an open portion, 1c denotes a step portion, 1d denotes a tapered portion, and 5 denotes a sample placed inside the container 1 for thermal analysis. Reference numeral 4 denotes a lid. The lid 4 is inserted into the open portion 1a of the container 1, and the end of the tapered portion 1d is bent to obtain a hermetic seal of the container 1. The above is the same as the above-mentioned conventional sealed sample container for thermal analysis. The difference from the conventional example is the shape of the lid 4. When the lid 4 is inserted into the opening 1a of the container 1 and sealed,
A cover hole 2 which is a blind hole is provided at a substantially central position of a surface on the inner side of the sample container to provide a thin portion with respect to the plate thickness of the cover 1. That is, a hole 2 that is formed inside the lid and that does not penetrate outside is provided. Here, since the hole 2 is a blind hole, the remaining wall thickness is thin and a thin portion exists at the bottom of the hole 2 of the lid 4. This thickness can be made any thickness by adjusting the depth of the hole 2. The pressure resistance against the pressure from the inside of this portion is set to be weaker than the sealing force between the container 1 and the lid 4.

Next, when the sealed sample container for thermal analysis as described above is installed in a thermal analyzer and the temperature of the sample container is raised, the sample 5 evaporates and decomposes, and the internal pressure in the sample container increases. Rise. When the internal pressure exceeds the pressure resistance limit of hole 2,
The thin portion at the bottom of the sample container is broken, and the generated gas inside the sample container is released to the outside, thereby preventing the internal pressure from rising. Also,
An explosion of the sample container is also prevented.

〔The invention's effect〕

According to the present invention, when a hermetically sealed sample container for thermal analysis is used, rupture and explosion of the sample container in the thermal analyzer can be prevented, and damage to the thermal analyzer can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of a conventional container and lid, and FIG. 3 is a cross-sectional view when the conventional container and lid are mounted. FIG. 1 ... container 1a ... bottom 1b ... open part 1c ... step 1d ... taper part 2 ... hole 4 ... lid 5 ... sample

Claims (1)

(57) [Claims] 1. A cylindrical container having a bottom on one side and an opening on the other side, a lid joined to the opening to seal the container, and a lid near an inner center of the lid. A blind hole provided to reduce the wall thickness, wherein the pressure resistance of the thin portion at the bottom of the blind hole is made weaker than the pressure resistance of the joint between the opening and the lid. Sealed sample container for thermal analysis.