JPH0610300Y2 - Electric furnace for thermal analysis - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric furnace used for heating a sample in various thermal analyzes such as a differential thermal analyzer, a thermogravimetric analyzer or a differential scanning calorimeter.

Since such an electric furnace for thermal analysis heats a sample to observe its thermal characteristics, it is necessary to heat each part of the sample to a uniform temperature. Therefore, it requires a sufficiently large volume and heat capacity as compared with the sample, and conventionally, asbestos or refractory brick was used as a heat insulating material, which was formed into a cylindrical shape and a heating wire was attached to the inner surface. However, since the heat capacity of the heat insulating material is extremely large and at the same time the heat conduction resistance is naturally large, it takes an extremely long time for heating and cooling. Therefore, when performing sequential measurements on multiple samples, place one sample in the furnace, gradually raise the temperature, measure the thermal characteristics at each temperature, then cool the furnace to room temperature and then The measurement of the sample must be started. Therefore, it takes a very long time for the measurement, and there is a drawback that the work efficiency is extremely bad. That is, the present invention provides an electric furnace which can eliminate the above-mentioned drawbacks and can efficiently perform cooling particularly in an extremely short time.

The present invention has a honeycomb heat insulating material made of a ceramic material having a large number of fine holes oriented in a certain direction, a cylindrical body formed so as to have an axis in the direction of the above holes as a furnace wall, and the heating wire on the inner surface thereof. Is attached to form an electric furnace for thermal analysis. As described above, in the electric furnace of the present invention, the cylindrical body used as a heat insulating material has a large number of holes, so that the heat capacity is small, and the large number of holes also has a small heat conduction resistance. Temperature can be raised. Moreover, since the holes are formed in the axial direction of the cylindrical furnace, there is an effect that the cooling air can be cooled very quickly by blowing cold air from one end surface of the furnace into the inside of the furnace wall during cooling. That is, since the furnace of the present invention can cool very quickly, the working efficiency thereof can be remarkably improved when thermal analysis is sequentially performed on a large number of samples.

1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along line XX of FIG. 1, FIG. 3 is an enlarged view of portion A in FIG. 1, and FIG. It is an enlarged view of the B section in FIG. As described above, the furnace of the present invention has the ceramic honeycomb heat insulating material 2 having a large number of fine holes 1.1 ... Which are oriented in a certain direction, and the direction of the holes 1.1. For example, the cylindrical body 2 is formed, and the heating wire 3 is attached to the inner surface of the cylindrical body 2 in a coil shape. If necessary, a protective plate 4 made of a refractory material is provided inside the heating wire 3 and the tubular body 2 is provided.
The outer surface of is also covered with the protective plate 5. If necessary, an appropriate heat-resistant material plate 6 may be inserted between the inner surface of the tubular body 2 of the honeycomb heat insulating material and the heating wire 3 as shown in the figure.

As described above, the electric furnace for thermal analysis of the present invention uses the honeycomb heat insulating material 2 of ceramic material having a large number of holes 1.1 ... It is small and can raise the internal temperature efficiently in a short time. Moreover, since the above holes 1.1 ... Are oriented in the axial direction of the furnace body, when cooling the furnace by blowing air from one end surface of the furnace body especially when the measurement is completed and the furnace is cooled, Cold air passes through the inside of a large number of fine holes 1.1 ... and blows to the other end surface. That is, since cooling air flows through the inside of the furnace wall, the furnace can be cooled very quickly and returned to room temperature. In other words, the heating and cooling of the furnace can be performed very quickly, and a large heat insulating effect can be obtained by the large number of holes 1.1 ... In the heated state, so that the thermal efficiency is high and the surrounding objects are heated. There is no such thing. As described above, since the electric furnace for thermal analysis of the present invention has a large thermal insulation effect, it has high thermal efficiency as in the conventional furnace and can be rapidly heated and cooled. In particular, during cooling, there is an effect that cooling air can be circulated inside the furnace wall to efficiently return to room temperature in a short time.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is an X of FIG.
-X sectional view, FIG. 3 is an enlarged view of a portion A in FIG. 1,
FIG. 4 is an enlarged view of portion B in FIG. In the figure, 1 is a hole, 2 is a heat insulating material, 3 is a heating wire, 4 and 5 are protective plates, and 6 is a heat resistant material plate.

Claims (1)

[Scope of utility model registration request] 1. A honeycomb body having a honeycomb heat insulating material made of a ceramic material having a large number of fine holes oriented in a certain direction, and an electric wire formed on the inner surface of a cylindrical body formed so as to have the direction of the holes as an axis. Electric furnace for thermal analysis with hot wires