| 摘要 |
A purge air control structure of a membrane dryer is provided to obtain a simple external appearance and reduce the manufacturing cost by omitting a separate purge air control valve, and prevent the hollow fibers from being damaged by buffering an impact directly applied to the hollow fibers by the purge air through a process of flowing purge air into hollow fibers in a housing. In a membrane dryer having a housing(20) in which a plurality of hollow fibers are arranged, a compressed air input side housing cap(10) connected to the housing at the upper stream side of compressed air, and a compressed air output side housing cap(30) connected to the housing at the downstream side of compressed air, a purge air control structure of the membrane dryer is characterized in that: the compressed air output side housing cap has a dry air inlet part(36) into which a portion of compressed air dried through the hollow fibers flows, and a purge air channel(31) that communicates with the dry air inlet part; the housing has a purge air inlet part(21) formed at one side thereof, and a purge air outlet part(22) formed at the other side thereof; the compressed air output side housing cap has a needle valve attachment part that communicates with the dry air inlet part and the purge air channel; and the purge air control structure further has a needle valve(40) attached to the needle valve attachment part to control the amount of purge air that flows into the purge air channel.
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