Method of and apparatus for testing airtightness of closed space provided with steam movement control device

摘要

A method and an apparatus confirms airtightness of a closed space in a housing provided with a steam movement control device. The apparatus includes an air feed passage and an air exhaust passage, which communicate with an interior of the housing. The air feed passage connects to a gas injection device, which supplies a gas at a predetermined pressure. The air exhaust passage connects to a pressure gauge. In the method, while gas at a predetermined pressure is injected into the housing through the air feed passage, pressure measurement is performed in the air exhaust passage from the housing, and a measured pressure value is compared with an injection pressure value. When the measured pressure value is substantially equal to the injection pressure value, airtightness in the housing is maintained. When the measured pressure value is lower than the injection pressure value, airtightness has been lost.