| 摘要 |
A sprinkler for roof of a clean room is provided to reduce a thickness of a connective tube and a manufacturing cost by eliminating an O-ring groove at the connective tube. A plurality of installation holes(210) are formed at a ceiling member(200) of a clean room. A joint(300) having an internal hole(310) is installed at the installation holes. A fixing bracket(120) is fixed to a connective tube(110). The connective tube penetrates the internal hole of the joint. The fixing bracket is fixed to an upper surface of the ceiling member by using a bolt(220). An O-ring(140) is installed at an upper surface of the internal hole of the joint to maintain a sealing state between the connective tube and the internal hole. An O-ring hub(130) is installed between the O-ring and the fixing bracket.
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