Title:
CITY WATER TREATMENT DEVICE
Document Type and Number:
Japanese Patent JP2022111964
Kind Code:
A
Abstract:
To provide a city water treatment device suctioning outdoor air in negative pressure at an orifice and having a structure that water leakage by a back flow is hardly caused even when back pressure acted to the orifice is increased.SOLUTION: In a city water treatment device, an annular groove part 47 is formed at the outer peripheral surface of a casing part, and an elastic ring 70 for back flow prevention allowing the inflow of outdoor air from a casing side outdoor air inlet 46E to the inside of a casing outdoor air flow passage 46 and suppressing the outflow of back flow water in the casing outdoor air flow passage from the casing side outdoor air inlet is mounted at the groove part. This allows water leakage from the casing side outdoor air inlet to be effectively suppressed by the elastic ring for back flow prevention even when back flow water is immersed into the casing outdoor air flow passage.SELECTED DRAWING: Figure 16A
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Inventors:
IKEDA HIROTAKE
Application Number:
JP2021007642A
Publication Date:
August 01, 2022
Filing Date:
January 20, 2021
Export Citation:
Assignee:
JAPAN STAR CO LTD
International Classes:
B01F23/2326; B01F23/20; B01F25/10; B01F25/30; B01F25/40; B05B7/04; B05B7/10; E03C1/084
Attorney, Agent or Firm:
Hideki Ueno