Title:
ANTI-BACKFLOW DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/138818
Kind Code:
A1
Abstract:
Disclosed is an anti-backflow device, comprising a ventilation component (10) and a pressing component (30), wherein the ventilation component (10) is an elastic component, and the ventilation component (10) comprises a wedge-shaped end part (15) and a ventilation component main body (12) for connection to an external air input pipe in a sleeved manner; a gap (156) allowing gas to pass therethrough is provided in the bottom surface of the wedge-shaped end part (15); the pressing component (30) comprises two clamping parts (32); when the pressing component (30) is in pressing fit with the ventilation component (10) in a sleeved manner, each of the clamping parts (32) is attached to one of the outer wall surfaces of the wedge-shaped end part (15); when an airflow passes through same, the wedge-shaped end part (15) and the clamping parts (32) are expanded, and the gap (156) in the bottom surface of the wedge-shaped end part (15) is opened; and when no airflow passes through same, each of the clamping parts (32) is attached to one of the outer wall surfaces of the wedge-shaped end part (15), and the gap (156) in the bottom surface of the wedge-shaped end part (15) is closed, such that fluid is prevented from flowing back into the ventilation component (10) through the gap (156). According to the device, the gap (156) is skillfully provided in the bottom surface of the wedge-shaped end part (15) of the ventilation component (10), the gap (156) can be easily pushed open when an airflow passes through same, and when the airflow is closed off, the clamping force of the clamping parts (32), the liquid pressure and the contraction force of the elastic component act together, such that the gap (156) is tightly closed.
Inventors:
YANG BANGBING (CN)
TAN GUANYU (CN)
TAN GUANYU (CN)
Application Number:
PCT/CN2020/070773
Publication Date:
July 15, 2021
Filing Date:
January 07, 2020
Export Citation:
Assignee:
SHENZHEN XINGRISHENG IND CO (CN)
International Classes:
F16K15/14
Foreign References:
| CN109578640A | 2019-04-05 | |||
| CN87204447U | 1988-04-06 | |||
| EP0268339A2 | 1988-05-25 | |||
| CN209370540U | 2019-09-10 | |||
| CN2095987U | 1992-02-12 | |||
| CN202893578U | 2013-04-24 | |||
| CN108223854A | 2018-06-29 | |||
| US4535819A | 1985-08-20 |
Attorney, Agent or Firm:
SHENZHEN RUIZHI PATENT AGENCY (CN)
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