JP2585776Y2 - Thermal analyzer - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a differential thermal analysis (DT)
A), thermogravimetry (TGA), thermomechanical analysis (TM)
A) The present invention relates to a thermal analyzer such as a differential scanning calorimeter (DSC), and particularly relates to improvement of a heating furnace which is an important component thereof.

[0002]

2. Description of the Related Art Generally, a thermal analyzer heats a sample placed in a heating furnace to a temperature of about 1500 ° C.
Provide a radiation shield on the outer periphery of the heating furnace to reflect radiant heat,
Further, a heat insulating cover is arranged so as to surround the radiation shield to prevent burns.

[0003]

[Problems to be Solved by the Invention] In the conventional thermal analyzer, the radiation shield and the heat insulating cover are made thick, heavy, and have a large heat capacity in order to reduce the energy loss of heating. Therefore, these shields and covers are tightly integrated with the heating furnace and assembled. When cooling the heating furnace (furnace tube), the cooling and heating must be performed from outside the radiation shield or heat insulation cover, and the temperature must be reduced to near room temperature. There is a problem that it takes a long time to lower the temperature.

An object of the present invention is to provide a thermal analyzer which has a high cooling effect of a heating furnace and enables rapid cooling.

[0005]

In order to achieve the above object, a thermal analyzer according to the present invention includes a heating furnace in which a sample is placed, a radiation shield surrounding the outer periphery thereof, and a surrounding outer periphery of the shield. In a thermal analyzer comprising a heat insulating cover disposed therein, a ventilation tube penetrating through the heat insulating cover and the radiation shield disposed around the heating furnace and facing the heating furnace, and a reflecting plate which jumps up into the ventilation cylinder by ventilation. And a cooling device for introducing cooling air through the ventilation tube is provided. As the cooling device, a blower device that blows outside air can be applied. Further, the above-mentioned reflection plate jumps up with the cooling air sent by the blower device, and can be mounted at an appropriate position in the ventilation tube. Further, it is preferable that the ventilation tube is not integral, but is cut or provided with a cut in the middle between the radiation shield and the cooling device.

[0006]

In the thermal analyzer configured as described above, when cooling the heating furnace, the outside air is directly sent into the heating furnace (furnace tube) through the ventilation tube by the blower device. The reflecting plate, which is provided at an appropriate position in the ventilation tube and jumps up by blowing air, works to prevent the blower device from being overheated by radiant heat on the furnace tube surface during heating.

Further, the cut portions and cuts of the ventilation tube are effective in preventing heat from being transmitted through the ventilation tube itself.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The thermal analysis apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic vertical sectional view of a DTA to which the present invention is applied, and FIG.

In DTA, as is well known, the sample S
And a reference sample R are set in a central portion of the heating furnace 1 and heated by a heater wire 2 wound around a furnace core tube 1, and are usually heated at a constant speed in a temperature range from room temperature to about 1500 ° C. A change in heat generated in the sample when the temperature is kept slightly isothermal is detected by the detector D as a temperature difference between the sample S and the reference sample R. The heating furnace 1 is surrounded by a radiation shield 3 and a heat insulating cover 4 to prevent energy loss. The radiation shield 3 and the heat insulating cover 4 are provided with cylinders 5a and 5b, respectively. The cylinders 5a and 5b and the cylinder 5c attached to the blower of the blower device 6 constitute the ventilation tube 5. Ventilation cylinder 5 (Cylinder 5
In (a), there is provided a reflecting plate 7 that can jump up by blowing air, thereby preventing the blower device from being overheated by the radiant heat from the surface of the furnace core tube 1 during the temperature rise.

Although the ventilation tube 5 is connected to the blower device 6, a gap 8 is provided between the ventilation tube 5 and the blower device 6 (between the cylinders 5b and 5c), thereby allowing the sample to be heated. The heat in the heating furnace 1 is transmitted to the blower device 6 via the ventilation tube 5 (cylinder body 5b) to prevent the device 6 from being overheated.

When the heating furnace 1 is cooled after the analysis is completed, cooling air (outside air) sent through the ventilation tube 5 by driving the blower device 6 is installed in the ventilation tube 5 (5a). The reflecting plate 7 is flipped up and directly hits the furnace core tube 1 to perform cooling. Further, the cooling air that has hit the furnace core tube 1 passes through the gap between the radiation shield 3 and the heat insulating cover 4 and is discharged to the outside through holes 9 and 10 formed at the top. In this manner, the heating furnace 1 (furnace tube) is rapidly cooled, and the time required to reach room temperature is greatly reduced.

By setting the position of the ventilation tube 5 facing the heating furnace 1 in the above embodiment to be further below the radiation shield 3, local cooling of the heater wire 2 is eliminated.
Since the entire area can be uniformly cooled, it can be expected that the baseline fluctuation at the time of cooling analysis is reduced and the analysis accuracy is improved.

[0013]

[Effect of the Invention] The present invention is configured as described above, and the cooling air is introduced through the ventilation tube facing the heating furnace, so that the heating furnace (core tube) can be cooled efficiently and the sample can be cooled. It is also possible to increase the cooling rate in the cooling analysis for decreasing the temperature. In addition, since the reflecting plate which is flipped up by blowing air is provided in the ventilation tube, radiant heat from the furnace tube during the temperature rise is less likely to be interrupted and radiated to the outside, thereby preventing the blower device from being overheated. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of the thermal analyzer of the present invention.

FIG. 2 is a schematic plan view of the thermal analyzer of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heating furnace (furnace tube) 3 ... Radiation shield 4 ... Heat insulation cover 5 ... Ventilation tube 6 ... Blower device 7 ... Reflector S ... Sample R ... Reference sample

Claims (1)

(57) [Scope of request for utility model registration] 1. A thermal analysis apparatus comprising a heating furnace in which a sample is placed, a radiation shield surrounding the outer periphery thereof, and a heat insulating cover arranged further surrounding the outer periphery of the shield. And a cooling device for introducing a cooling air through the ventilation tube, wherein a ventilation plate which penetrates the heating furnace and is open to the heating furnace is provided, and a reflection plate which jumps up by ventilation is provided in the ventilation tube. apparatus.