US 12,667,799 B2Granted

In-line strainer

AssigneeThree-M Industry Co., Ltd.

InventorHideo Okuno

Life of this patent

Estimating the term…

Loading patent…

Abstract

Provided is an in-line strainer capable of more reliably preventing the concentrated adhesion and accumulation of solid foreign matter or the like on a portion of a screen. In an in-line strainer according to the present invention, a housing 9 includes a cylinder wall 24 that is formed in a hollow cylindrical shape and extends in the vertical direction, and a top wall 25 that closes an upper end of the cylinder wall 24. The filter chamber 8 is divided into a primary flow path chamber 39 formed on the upper side and communicating with an inflow port 6 and a secondary flow path chamber 40 formed on the lower side and communicating with an outflow port 7, and a through-hole 38 is provided in an open manner between the two chambers 39 and 40. The screen 10 includes a filter cylinder 33 that is formed in a vertically long hollow cylindrical shape having openings at upper and lower ends, and a bottom lid 34 that closes the lower-end opening of the filter cylinder 33, and an introduction port 36 that allows introduction of liquid is formed at the upper end of the filter cylinder 33. The screen 10 is disposed in the filter chamber 8, in an orientation such that the introduction port 36 faces the through-hole 38, and the outflow port 7 is provided in an open manner in the cylinder wall 24 that faces the lower half of the filter cylinder 33.

A filtration device comprising:

a housing (9) including
a filter chamber (8) extending vertically and formed by a hollow cylindrical wall (24) and a top wall (25) closing an open upper end of the hollow cylindrical wall (24);
a hollow cylindrical pressing shaft (55) extending into the filter chamber (8) from the top wall (25);
an inflow port (6) through which liquid to be filtered flows in;
and
an outflow port (7) formed partially on a left rear circumferential surface of the hollow cylindrical wall (24) through which filtered liquid flows out;
an inflow pipe (11) provided on a left side of the housing and in fluid communication with the inflow port (6);
an outflow pipe (12) provided on a right side of the housing and in fluid communication with the outflow port (7);
a hollow frustoconical screen element (10) having a frustoconically shaped screen wall (33) defining a hollow prefilt cavity with an upper open end and a lower open end, disposed in the filter chamber (8) to filter liquid flowing in from the inflow port (6);
a pressing plate (47) having at least one liquid passage hole (54) extending therethrough, dividing the filter chamber (8) into an upper primary flow path chamber (39) in fluid communication with the inflow port (6) and a lower secondary flow path chamber (40) in fluid communication with the outflow port (7);
a through-hole (38) provided between the upper primary flow path chamber (39) and the lower secondary flow path chamber (40), the hollow frustoconical screen element (10) extending through the through-hole (38);
a pressure spring (48) compressively extending between a bottom end face surface (99) of the hollow cylindrical pressing shaft (55) and the pressing plate (47), such that a biasing force is exerted on the pressing plate (47) downwardly to hold the hollow frustoconical screen element (10) in place;
a connecting pipe (44) having a first end in fluid communication with the outflow port (7) and a second end in fluid communication with the outflow pipe (12), the connecting pipe (44) being protrudingly formed on an outer circumferential surface of a rear half of the hollow cylindrical wall (24) and extending obliquely upward while winding around the outer circumferential surface of the hollow cylindrical wall (24);
and
a bottom lid (34) closing the lower open end of the hollow frustoconical screen element (10).

12 more elements

Abstract

Claims11