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Title:
BACKFLOW PREVENTER AND ENGINE EGR SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/127099
Kind Code:
A1
Abstract:
A backflow preventer, comprising one or a plurality of reducing rings (61) that are disposed in a pipeline (11); the outer edges of the reducing rings (61) are connected to the inner wall of the pipeline (11); the plurality of reducing rings (61) are arranged along the axis of the pipeline (11); and the actual internal area of the reducing rings (61) are gradually decreased in the axial direction of the reducing rings. Further disclosed is an engine EGR system comprising the backflow preventer. The backflow preventer can generate, according to different flowing directions in a pipeline, throttling losses of different degrees; when an air flows in a direction (forward direction) in which the actual internal area of the reducing rings decreases, the throttling loss is small; and when then air flows in a direction (reverse direction) in which the actual internal area of the reducing rings increases, the throttling loss is large. Therefore, the reducing rings are capable of suppressing reverse flow and promoting forward flow when air reciprocates in the pipeline, and thereby preventing the air from backflow in the pipeline.

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Inventors:
LI WEI (CN)
LIU JUNLONG (CN)
LI ZHIJIE (CN)
PAN JIE (CN)
WANG ZUOFENG (CN)
LIU CHUNTAO (CN)
KANG TIANQIN (CN)
Application Number:
PCT/CN2017/118997
Publication Date:
July 04, 2019
Filing Date:
December 27, 2017
Export Citation:
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Assignee:
WEICHAI POWER CO LTD (CN)
International Classes:
F02M26/13
Foreign References:
CN102906377A2013-01-30
US20170284342A12017-10-05
CN201461146U2010-05-12
CN108180090A2018-06-19
JP2010144700A2010-07-01
JP2007085248A2007-04-05
CN105822463A2016-08-03
Other References:
See also references of EP 3734054A4
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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