JPH0678857U - Thermal analyzer - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a thermal analysis device which has a high cooling effect of a heating furnace and enables rapid cooling. [Composition] A ventilation tube is provided which penetrates a heat insulating cover and a radiation shield arranged around the heating furnace and is opposed to the heating furnace, and a cooling device which introduces cooling air through the ventilation tube is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thermal analysis device such as a differential thermal analysis (DTA), a thermogravimetric measurement (TGA), a thermomechanical analysis (TMA), and a differential scanning calorimetry (DSC), and is an important component thereof. Regarding improvement of heating furnace.

[0002]

[Prior art]

 Generally, in a thermal analyzer, a sample installed in a heating furnace is heated up to a temperature of about 1500 ° C. Therefore, a radiation shield that reflects radiant heat is provided on the outer circumference of the heating furnace, and a radiation shield is provided to prevent burns. A heat insulating cover is arranged to surround the.

[0003]

[Problems to be solved by the device]

 In conventional thermal analyzers, the radiation shield and heat insulating cover are thick, heavy and have a large heat capacity in order to reduce heating energy loss, and these shields and covers are heated to improve heat retention. It is firmly integrated with the furnace, and when cooling the heating furnace (core tube), it must be done from the outside of the radiation shield and heat insulating cover, and it takes a long time to lower the temperature to near room temperature. There was a problem that it took.

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

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the thermal analyzer of the present invention is provided with a ventilation tube that penetrates the heat insulating cover and the radiation shield arranged around the heating furnace and faces the heating furnace, and cools through this ventilation tube. It is provided with a cooling device for introducing the working air. As the cooling device, a blower device that blows outside air can be applied. Further, it is effective to attach a reflecting plate, which can bounce up with cooling air and allow air to pass therethrough, at an appropriate position in the ventilation tube. Furthermore, it is preferable that the ventilation tube is not a single piece, but is cut or provided with a cut line between the radiation shield and the cooling device.

[0006]

[Action]

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

Further, the cut portion or cut line of the ventilation tube is effective in preventing heat from being transmitted through the ventilation tube itself.

[0008]

【Example】

 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. 2 is a schematic plan view thereof.

In the DTA, as is well known, the sample S and the reference sample R are installed in the central portion of the heating furnace 1 and are heated by the heater wire 2 wound around the furnace core tube 1 and usually at room temperature. From this, the temperature change between the sample S and the reference sample R is detected as a temperature difference between the sample S and the reference sample R by the detector D in the temperature range of about 1500 ° C. when the temperature is increased or decreased at a constant rate or when the temperature is kept constant. The heating furnace 1 is surrounded by a radiation shield 3 and a heat insulating cover 4 in order to prevent energy loss. The radiation shield 3 and the heat insulating cover 4 are provided with cylinders 5a and 5b, and the cylinders 5a and 5b and the cylinder 5c attached to the blower port of the blower device 6 constitute a ventilation cylinder 5. Inside the ventilation tube 5 (cylindrical body 5a), there is provided a reflection plate 7 capable of jumping up by blowing air, which prevents the blower device from being overheated by the radiant heat from the surface of the furnace core tube 1 during the temperature rise. Can be prevented.

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), whereby the sample is heated. The heat in the heating furnace 1 is prevented from reaching the blower device 6 through the ventilation tube 5 (cylindrical body 5b) and overheating the device 6.

When the analysis is completed and the heating furnace 1 is cooled, the 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 for cooling. Further, the cooling air that hits 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 the holes 9 and 10 formed in the upper portion. In this way, the heating furnace 1 (furnace core tube) is rapidly cooled, and the time to reach room temperature is greatly shortened.

The ventilation tube 5 facing the heating furnace 1 in the above embodiment is positioned further below the radiation shield 3 to eliminate local cooling of the heater wire 2 and make the entire area uniform. Since it can be cooled to a low temperature, it can be expected to reduce the baseline fluctuation during temperature drop analysis and improve the analysis accuracy.

[0013]

[Effect of device]

 Since the present invention is configured as described above, it is possible to efficiently cool the heating furnace (core tube), and it is also possible to increase the temperature lowering rate in the temperature lowering analysis that lowers the sample temperature. Become.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a thermal analysis apparatus of the present invention.

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

[Explanation of symbols]

1 ... Heating furnace (core tube) 3 ... Radiation shield 4 ... Insulation cover 5 ... Ventilation tube 6 ... Blower device 7 ... Reflector S ... Sample R ... Reference sample

Claims (1)

[Scope of utility model registration request] 1. A thermal analyzer comprising a heating furnace in which a sample is installed, a radiation shield surrounding the outer periphery of the furnace, and a heat insulating cover surrounding the outer periphery of the shield, wherein the heat insulating cover and the radiation shield are provided. A thermal analysis device, comprising: a ventilation tube that penetrates through the heating furnace and is opposed to the heating furnace, and includes a cooling device that introduces cooling air through the ventilation tube.