| 摘要 |
PURPOSE: An internal pressure adjustment apparatus of an airtight space is provided to rapidly realize an equilibrium process as well as to reduce the cost of manufacturing by simplifying its structure. CONSTITUTION: An internal pressure adjustment apparatus for an air tight space includes a pipe(8), a cap(1), a case(7), a bush(2), an insertion ring(3), an insertion switching ring(4), an outflow ring(5) and an outflow switching ring(6). The cap(1) seals the top of the pipe(8). The case(7) is provided with a plurality of through-holes for connecting the inside to the outside. The bush(2) seals the top of the case(7). The insertion ring(3) is installed on the bottom of the case(7) and is provided with a through-hole so that the air can flow into the inside of the air tight space. The insertion switching ring(4) switches the through-hole of the insertion ring(3). The outflow ring(5) is installed on the middle of the case(7) and is provided with a through-hole so that the air can outflow to the outside. And, the outflow switching ring(6) switches the through-hole of the outflow ring(5).
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