在倒U型管垂直段的两端内分别放置一个整流环，来消除入口弯头对垂直段流动的影响。
The fairing rings are built in the inlet and outlet of the vertical parts of inverse U bend respectively in order to restrain the effect of bend on the flow in it.
硅胶管入口一端要压紧，必要时包上橡皮膏。
The entrance of silicone tube at one end need to compress, if necessary, wrapped it in plaster.
吸入室安装在异径 管的喇叭口端，吸入室的另一端为吸入口。
The sucking room is provided on the bellmouthing end of the reducing pipe, another end of the sucking room is a suction inlet.
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