21-01-2021 дата публикации
Номер: US20210017754A1
Принадлежит:
The present disclosure provides a return gas prevention device for a drainage pipe, belonging to the technical field of drainage pipes. The device realizes two functions of water seal and a check valve simultaneously, as well as prevents gas channeling in a drainage process. 118911314111213141141141112111516171111112112. A return gas prevention device for a drainage pipe , comprising: a round pipe () , a water inlet () , a water outlet () and a drainage mechanism , wherein the round pipe () comprises an upper sealing plate () , a lower sealing plate () , a first partition plate () and a second partition plate () , the upper sealing plate () and the lower sealing plate () are located at upper and lower ends of the round pipe () respectively , a third through-hole () is disposed on the lower sealing plate () , the first partition plate () and the second partition plate () are both located inside the round pipe () and partition the interior of the round pipe () into an upper cavity () , a middle cavity () and a lower cavity () in a top-down sequence , a first through-hole () is disposed on the first partition plate () , and a second through-hole () is disposed on the second partition plate ();{'b': 8', '15', '9', '14', '141, 'the water inlet () is in communication with the bottom of the upper cavity (), and the water outlet () is disposed on the lower sealing plate () and in communication with the third through-hole (); and'}{'b': 2', '2', '15', '2', '15', '121', '111', '141', '2', '15', '111', '141', '121', '2', '15, 'the drainage mechanism comprises a floating ball (), a guiding structure and a blocking structure, wherein the floating ball () is located inside the upper cavity (), the guiding structure enables the floating ball () to move up and down in the upper cavity () along with rise and fall of a water level; the blocking structure is capable of blocking the second through-hole () and opening the first through-hole () and the third through-hole () ...
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