Apparatus for measuring the degree of vacuum of a multistage vacuum heat-insulating member, and measurement method using same
An apparatus for measuring the degree of vacuum of a multistage vacuum heat-insulating member and to a measurement method using the same includes a chamber in which a plurality of vacuum heat-insulating members are accommodated and which forms a sealed space; a shelf arranged within the chamber so as to support the plurality of vacuum heat-insulating members in a plurality of layers; a displacement sensor for sensing the displacement of each outer shell of the vacuum heat-insulating members stacked on the shelf; and a vacuum unit connected to the chamber so as to regulate the pressure of the internal space of the chamber.
1. An apparatus for measuring a degree of vacuum of a multistage vacuum heat-insulating panel, the apparatus comprising:
a chamber accommodating a plurality of vacuum insulating panels and providing a closed space;
a plurality of shelves placed in the chamber and supporting the plurality of vacuum insulating panels disposed in multiple stages;
a plurality of displacement sensors configured to measure displacements of sheaths of the vacuum insulating panels placed on the shelves, respectively; and
a vacuum unit connected to the chamber, and configured to adjust a pressure of an interior space of the chamber.
2. The apparatus according to claim 1 , wherein the shelves are multilayered, and each of the shelves comprises through-holes arranged at constant intervals.
3. The apparatus according to claim 1 , wherein each of the shelves comprises an exposed surface through which the plurality of vacuum insulating panels face a ceiling surface of the chamber.
4. The apparatus according to claim 1 , further comprising:
a pressure sensor configured to measure the pressure of the chamber.
5. The apparatus according to claim 1 , wherein each of the displacement sensors comprises:
a light source configured to generate a laser beam; and
a light detector configured to detect the laser beam reflected by the sheath of the vacuum insulating panel.
6. The apparatus according to claim 1 , further comprising:
a control valve configured to open and close a connection between the vacuum unit and the chamber.
7. An apparatus for measuring a degree of vacuum of a multistage vacuum heat-insulating panel, the apparatus comprising:
a chamber accommodating a plurality of vacuum insulating panels and providing a closed space;
a plurality of shelves placed in the chamber and supporting the plurality of vacuum insulating panels disposed in multiple stages;
a displacement sensor configured to measure displacements of sheaths of the vacuum insulating panels, the displacement sensor being movable in the chamber; and
a vacuum unit connected to the chamber, and configured to adjust a pressure of an interior space of the chamber.
8. The apparatus according to claim 7 , wherein the displacement sensor comprises:
a light source configured to generate a laser beam; and
a light detector configured to detect the laser beam reflected by the sheaths of the vacuum insulating panels.
9. The apparatus according to claim 7 , further comprising:
a guide unit disposed at an upper side of the chamber, and configured to guide the displacement sensor to slide leftward or rightward.
10. The apparatus according to claim 9 , wherein the guide unit comprises:
a bogie connected to the displacement sensor, and configured to move the displacement sensor;
a slide rail connected to the bogie, and configured for the bogie to slide thereon; and
a drive motor configured to provide power for driving the bogie.
11. The apparatus according to claim 10 , wherein the guide unit further comprises:
a drive switch configured to
receive a user command, and
control driving of the drive motor.
12. A method of measuring a degree of vacuum of a vacuum heat-insulating panel comprising a core and a sheath surrounding the core, the method comprising:
accommodating a plurality of vacuum insulating panels in an interior space of a chamber;
closing the chamber;
creating a vacuum in the interior space of the chamber; and
measuring, by at least one displacement sensor, displacements of sheaths of the vacuum insulating panels to determine damage of the vacuum insulating panels, wherein the vacuum insulating panels are disposed in multiple stages and supported by a plurality of shelves placed in the chamber.
13. The method according to claim 12 , wherein the at least one displacement sensor comprises
a non-contact sensor which uses a laser beam as a light source.
14. The method according to claim 13 , wherein the at least one non-contact sensor measures changes of heights of the sheaths as the displacements when a pressure of the chamber is atmospheric pressure and when the chamber is under vacuum.