Filter device

Patent metadata

Field	Value
Publication number	US-2018229162-A1
Application number	US-201815953539-A
Country	US
Kind code	A1
Filing date	Apr 16, 2018
Priority date	Oct 30, 2015
Publication date	Aug 16, 2018
Grant date	—

Abstract

When a lid covers an opening portion formed at an upper end of a filter case with a bottomed substantially cylindrical shape inside which a filter element is disposed, the internal space between the lid and the filter case is formed. A bypass flow path connecting the internal space and outside space is formed in the lid, and a relief valve disposed moveably between a position closing the bypass flow path and a position opening the bypass flow path includes an air bleeder formed from a porous material.

First claim

1 . A filter device, comprising:
a filter element comprising a filtration member having a substantially cylindrical shape; a filter case having a bottomed substantially cylindrical shape inside which the filter element is disposed; a lid that covers an opening portion formed at an upper end of the filter case and defines an internal space between the lid and the filter case, a bypass flow path connecting the internal space and outside space of the filter case being formed in the lid; and a relief valve disposed moveably between a position closing the bypass flow path and a position opening the bypass flow path, the relief valve comprising an air bleeder formed from a porous material.

2 . The filter device according to claim 1 , wherein
a hole defining the bypass flow path is formed in the lid; the relief valve is a plate-like portion that covers the hole and is formed entirely from the porous material.

3 . The filter device according to claim 1 , wherein
a hole defining the bypass flow path is formed in the lid; the relief valve covers the hole; a through-hole that connects the internal space and the outside space is formed in the through-hole; and the air bleeder is disposed covering the through-hole.

4 . The filter device according to claim 3 , wherein
the filter element comprises an upper plate that covers an upper end surface of the filtration member; the air bleeder is disposed on the upper plate; and the air bleeder covers the through-hole.

5 . The filter device according to claim 1 , wherein
the filter element comprises the filtration member, a second filtration member disposed inward of the filtration member and coaxial with the filtration member, the second filtration member having a substantially cylindrical shape with a shorter length than the filtration member, an upper plate that supports the filtration member and the second filtration member with a predetermined gap therebetween, an upper through-hole being centrally formed in the upper plate, a first lower plate that covers a lower end surface of the filtration member, a lower through-hole being centrally formed in the first lower plate, and a second lower plate that covers a lower end surface of the second filtration member; the filter case comprises an inflow hole through which liquid flows into the internal space, and an outflow hole through which liquid flows out; and an fitting cylinder that engages with the lower through-hole is disposed in the outflow hole.

Assignees

• Yamashin Filter Corp

Inventors

• Oshita Tatsuhiro
• Taku Meiho
• Ishizuka Makoto

Classifications

• B01D29/50

  with multiple filtering elements, characterised by their mutual disposition (B01D29/39 takes precedence) · CPC title

• B01D29/00

  Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor · CPC title

• B01D29/11

  with bag, cage, hose, tube, sleeve or like filtering elements · CPC title

• B01D24/00

  Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof (B01D27/02 takes precedence) · CPC title

• B01D35/147

  Bypass or safety valves · CPC title