| 摘要 |
<p>An internal pressure control device and internal pressure control method for a hermetic structure, which are capable of maintaining the absolute pressure inside the hermetic structure substantially constant and, in addition, capable of maintaining a differential pressure between the inside and outside of the hermetic structure within a predetermined limit value. The internal pressure control device works as follows: under normal conditions, the device outputs the internal pressure of an hermetic structure to a control means (18) so that the absolute pressure inside the hermetic structure is within a predetermined range, and when a differential pressure detected by a differential pressure detector (14), which detects a differential pressure between the inside and outside of the hermetic structure, is out of the allowable range, a differential pressure determination means (17) is activated and a signal inputted in the control means (18) is switched by switching means (19) to the differential pressure to adjust the internal pressure of the hermetic structure. The internal pressure control method for the hermetic structure works as follows: when a differential pressure between the internal pressure and outer pressure is within an allowable range, the method controls the internal pressure of the hermetic structure so that the absolute pressure inside the structure is within a predetermined range, and when the differential pressure is outside the allowable range, the method controls the internal pressure of the hermetic structure so that the differential pressure is within the predetermined range.</p> |
