Thermal conductivity measuring device, heating device, thermal conductivity measuring method, and quality assurance method

Patent metadata

Field	Value
Publication number	US-11454599-B2
Application number	US-201916559746-A
Country	US
Kind code	B2
Filing date	Sep 4, 2019
Priority date	Sep 6, 2018
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A thermal conductivity measuring device includes a sample container that has a plurality of storage sections; a drive unit that is configured to move the plurality of storage sections of the sample container; and a radiation thermometer that is configured to measure the temperature of a predetermined position of the sample container.

First claim

The invention claimed is:

1. A thermal conductivity measuring device comprising:
a sample container within a heat insulating material that has a plurality of storage sections, wherein the heat insulating material has a measurement hole;
an induction heater surrounding the heat insulating material;
a drive unit that is configured to move the plurality of storage sections of the sample container; and
a radiation thermometer that is configured to measure a temperature of a surface of the sample container, wherein
a standard sample having known thermal conductivity is installed in at least one of the storage sections, and an object sample which is needed to obtain thermal conductivity is installed in the other storage sections.

2. The thermal conductivity measuring device according to claim 1 ,
wherein the drive unit is configured to rotate the sample container.

3. The thermal conductivity measuring device according to claim 1 ,
wherein the drive unit is configured to rotate the sample container, and
the radiation thermometer is fixed and measure each temperature of the surfaces of the storage sections of the sample container which is rotated.

4. The thermal conductivity measuring device according to claim 1 ,
wherein the sample container has a circle shape or a doughnut shape in a plan view, and is rotatable by the drive unit, and
the sample container has an exposed main surface which is selected from an upper surface, a side surface and a lower surface thereof, and the storage sections, in which a sample to be measured is installed, are provided in the exposed main surface, and
the radiation thermometer is fixed at a position which faces to the exposed main surface.

5. The thermal conductivity measuring device according to claim 1 ,
wherein the sample container has a doughnut-like disk shape, or cylindrical shape.

6. The thermal conductivity measuring device according to claim 1 ,
wherein the first part of the heat-insulating material has a temperature measurement hole for the radiation thermometer.

7. A heating device comprising:
an induction heat source;
a sample container that is provided on an upper surface or a side surface of the heat source and has a plurality of storage sections;
a drive unit that is configured to rotate the heat source and thereby rotate the sample container together with the heat source;
a radiation thermometer that is configured to measure a temperature of a surface of the sample container; and
a heat-insulating material that covers at least a portion of a surface of the heat source,
wherein the heat-insulating material forms at least a space that surrounds the sample container,
wherein a surface of the sample container opposite to the heat source is exposed to the space that is surrounded by the heat-insulating material, and
wherein the heat-insulating material has
a first part which surrounds a lateral side of the heat source,
a second part which surrounds an upper side of the heat source, and
a third part which surrounds a lower side of the heat source,
wherein
the first part and the third part forms a first space in which the heat source is provided, and
the second part forms a second space in which the sample container is provided,
a thickness of the first part is larger than that of the second part, and
the second part has a temperature measurement hole for the radiation thermometer.

8. A thermal conductivity measuring method comprising:
a measurement step of moving a standard sample and an object sample within a sample container within a heat insulating material that has a plurality of sections to measure temperatures of the standard sample and the object sample at same position, wherein the heat insulating material has a measurement hole;
a heating step using an induction heater surrounding the heat insulating material; and
a derivation step of obtaining a thermal conductivity, of the object sample in a measurement environment on the basis of the respective temperatures measured in the measurement step.

9. The thermal conductivity measuring method according to claim 8 ,
wherein in the measurement step, the standard sample and the object sample are rotationally moved and the temperatures of the standard sample and the object sample are measured at the same position.

10. The thermal conductivity measuring method according to claim 8 ,
wherein in the measurement step, measurement environment is selected, environment is set to the selected measurement environment, and the temperatures of the samples are measured using a fixed radiation thermometer under the selected and set measurement environment.

11. The thermal conductivity measuring method according to claim 8 ,
wherein the derivation step includes
a step of forming a calibration curve using simulation, wherein known thermal conductivities of the standard sample and a comparative sample are provided on a horizontal axis, and a difference obtained by subtracting a measured temperature of the comparative sample from a calculated temperature of the standard sample is provided on a vertical axis, wherein the calculated temperatures are obtained in simulation, and
a step of determining the thermal conductivity of the object sample by obtaining a difference between the temperature of the standard sample and the temperature of the object sample measured in the measurement step, and applying the difference to the calibration curve.

12. The thermal conductivity measuring method according to claim 8 ,
wherein the temperatures of at least two standard samples and at least one object sample are measured at the same position in the measurement step and,
in the derivation step, a confirmation is performed whether or not there is a combination of the measured temperatures of the standard samples wherein the measured temperature of the object sample falls between the measured temperatures of the standard samples, and if there is such a combination, it is determined that the object sample has a thermal conductivity which falls between thermal conductivities of the standard samples in the combination.

13. A quality assurance method comprising:
a measurement step of moving a first standard sample having a first thermal conductivity value, a second standard sample having a second thermal conductivity value, and an object ample within a sample container within a heat insulating material that has a plurality of sections, and measuring temperatures of the first standard sample, the second standard sample, and the object sample at same position; respectively, wherein the heat insulating material has a measurement hole;
a heating step using an induction heater surrounding the heat insulating material; and
a determination step of determining whether or not a measured third temperature of the object sample falls between a first temperature of the first standard sample and a second temperature of the second standard sample that are measured.

14. The quality assurance method according to claim 13 , wherein the temperatures of the standards samples and the object sample are measured in the measurement step with a fixed radiation thermometer.

15. The quality assurance method according to claim 13 , wherein a thermal conductivity measuring device is used, wherein the device comprises:
a sample container that has a plurality of storage sections;
a drive unit that is configured to move the plurality of storage sections of the sample container; and
a radiation thermometer that is configured to measure a temperature of a surface of the sample container.

16. The quality assurance

Assignees

• Showa Denko Kk

Inventors

• Fujikawa Yohei

Classifications

• G01K7/08

  the object to be measured forming one of the thermoelectric materials, e.g. pointed type · CPC title

• G01N25/20 Primary

  by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity (calorimeters per se G01K) · CPC title

• G01J5/12

  using thermoelectric elements, e.g. thermocouples · CPC title

• G01K1/143

  for measuring surface temperatures · CPC title

• G01N25/18 Primary

  by investigating thermal conductivity (by calorimetry G01N25/20; by measuring change of resistance of an electrically-heated body G01N27/18) · CPC title