# US 10,441,899 B2 · Filter apparatus

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- Number: US 10,441,899 B2
- Document ID: US10441899B2
- Status: Granted
- Kind: B2
- Application number: 15/598,553
- Filed: 2017-05-18
- Published: 2017-11-30
- Granted: 2019-10-15
- Earliest claimed: 2016-05-27
- Assignees: Yamashin-Filter Corp.
- Applicants: Yamashin-Filter Corp.
- Inventors: Mitsunobu Okamoto; Makoto Ishizuka
- Web page: https://patentgrep.com/patent/US10441899B2

## CPC

- B01D 19/0057: {the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet}
- B01D 19/0031: {by filtration}
- B01D 29/114: {arranged for inward flow filtration (B01D29/15, B01D29/33 take precedence)}
- B01D 29/908: {provoking a tangential stream}
- B01D 29/925: {containing liquid displacement elements or cores}
- B01D 35/0276: {Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A liquid is made to flow into a filter case from a tangential direction at any point on a side surface of the filter case and produces a swirling flow. Bubbles collected in a center of the swirling flow are retained by a retainer plate, thereby removing the bubbles from the liquid. A filter element filters the liquid from which the bubbles were removed.

## Claims

### Claim 1

A filter apparatus, comprising:
a filter case having a bottomed substantially cylindrical shape;
a bubble removing portion including
an inflow pipe that is provided to a side surface of the filter case, wherein the inflow pipe is configured to cause a liquid to flow into the filter case from a tangential direction at any point on the side surface of the filter case, and produce a swirling flow in the liquid that flowed into the filter case, and
a retainer plate that is provided to an interior of the filter case, wherein the retainer plate is configured to retain bubbles collected in a center of the swirling flow by the swirling flow, and that the retainer plate is positioned on an upper side of the inflow pipe in a height direction;
a filter element that is provided to the interior of the filter case and comprises a filtration material, wherein the filtration material is configured to filter the liquid that passes through the bubble removing portion; and
an outflow pipe that has a substantially cylindrical shape and communicates with a hollow portion of the filter element,
wherein the inflow pipe is provided in a neighborhood of a bottom surface of the filter case, and the retainer plate is provided to a lower side of the filter element.

### Claim 2 (depends on 1)

The filter apparatus according to claim 1, wherein
the filter element comprises an upper plate that covers an upper end surface of the filtration material, and a lower plate that covers a lower end surface of the filtration material and is the retainer plate.

### Claim 3 (depends on 1)

The filter apparatus according to claim 1, wherein
a diameter of the retainer plate is greater than a diameter of the filtration material.