JPH074558Y2 - Thermal analyzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat insulating mechanism between a sample heating unit and a thermal characteristic detection unit in a thermal analysis apparatus.

When the heat that heats the thermal analysis sample is transmitted to the detection unit, it not only causes a measurement error, but also affects the accuracy and life of the device. For this reason, conventionally, means such as providing a fin for cooling on the outside of the container connecting the sample portion and the characteristic detecting portion or attaching a cooling water conduit has been taken. However, the fins have drawbacks such that they cannot be sufficiently cooled and the outer shape of the device becomes extremely large. Further, when using cooling water, there are drawbacks that the piping is not easy and the installation location of the device is limited. Therefore, the present invention provides a device without such drawbacks.

According to the present invention, the sample heating unit and the thermal characteristic detection unit of the sample are connected by a cylindrical case, a radiant heat shielding plate is provided inside the case, and one end of the heat pipe is connected to the cylindrical case. The heat radiating fin is provided on the other end of the heat pipe and wound on the outside, and the radiating fin is opposed to the cooling fan. That is, the heat transmitted as radiation from the sample heating unit to the detection unit is blocked by the shielding plate. Further, the heat transmitted through the cylindrical case by conduction is taken as the heat of vaporization of the liquid sealed in the heat pipe, so that the detection portion is also prevented from being heated by conduction. The gas evaporated in the pipe rises in the pipe, is cooled by the fan, returns to liquid again, flows down in the pipe, and reaches the portion of the cylindrical case. Therefore, according to the present invention, it is not necessary to directly attach a large-scale cooling device to the case part of the analyzer, and large-scale pipes and a water source are not required unlike the case of using cooling water. Can be installed. Further, the cooling by the fan can be configured at any position apart from the analyzer, so that there is no drawback that it hinders the handling of the analyzer.

1 is a longitudinal sectional view, FIG. 2 is a lateral sectional view, and FIG. 3 is a front view. in this way,
A sample 1 for thermogravimetric analysis and a standard sample 2 corresponding thereto are connected to arms 5 and 6 of a balance respectively at the base ends of a rod 3.4 having tips attached thereto, and the sample portions are arranged in a heating furnace 7. That is, the weight change of the sample due to the temperature change is detected by the difference from the weight of the standard sample. The furnace 7 is provided with a heating wire 8 inside a heat resistant insulator, and is connected to a case 9 of a thermal characteristic detecting portion such as the balance with a cylindrical case 10. The radiant heat shield plate 11 is placed inside the case 10.
And one end of the heat pipe 12 is wound around the outside, for example, several times. The heat pipe 12 is a sealed metal tube with good heat conduction that contains a small amount of a suitable liquid that evaporates easily. The fan 14 is opposed.

In such an apparatus, the balance from sample 1.2 to balance 5.6
The radiant heat entering the thermal characteristic detecting section is blocked by the shielding plate 11 and the heat transmitted through the cylindrical case 10 heats the liquid contained in the heat pipe 12 to evaporate it. Therefore, a large amount of heat is taken from the case 10 by the heat of evaporation, and the temperature rise of the balance 5.6 can be prevented extremely effectively. The evaporated liquid in the pipe rises in the pipe to reach the fins 13 and is cooled by the fan 14 to be liquefied again. Therefore, the liquid flows down in the pipe 12 to absorb the heat of the case 10 again. repeat. Further, the fin 13 and the fan 14 can be arranged at a position separated from the thermal characteristic detecting section by charging and separating, and there is no drawback that the installation place of the analyzer is restricted because cooling water etc. is not required. In addition, the sample and the detector can be configured in a small size and easily arranged in a narrow place.

[Brief description of drawings]

1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a lateral sectional view of the apparatus of FIG. 1, and FIG. 3 is a front view of the apparatus of FIGS. In the figure, 1 is a sample, 2 is a standard sample, 3.4
Is a rod, 5.6 is a balance arm, 7 is a heating furnace, 8 is a heating wire, 9 is a case of a thermal characteristic detection unit, 10 is a cylindrical case, 11 is a radiant heat shielding plate, 12 is a heat pipe, 13 is a radiation fin, 14 is a fan.

Claims (1)

[Scope of utility model registration request] 1. A sample heating section and a thermal characteristic detection section of the sample are connected by a cylindrical case, a radiant heat shielding plate is provided inside the case, and one end of a heat pipe is connected to the cylindrical case. A thermal analysis device in which the heat radiating fin is provided on the other end of the heat pipe and the heat radiating fin is opposed to a cooling fan.