Filter cleaning method and filter cleaning apparatus

Patent metadata

Field	Value
Publication number	US-11219930-B2
Application number	US-201816648135-A
Country	US
Kind code	B2
Filing date	Dec 12, 2018
Priority date	May 28, 2018
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The present invention provides a new filter cleaning method that has cleaning performance superior to that of ultrasonic cleaning. The method for cleaning a filter of the present invention includes the steps of: generating a shock wave; and bringing the shock wave into contact with a filter to which a filler adhered, wherein in the shock wave contacting step, a pressure applied to the filter by the shock wave is 0.07 MPa or more.

First claim

The invention claimed is:

1. A method for cleaning a filter, comprising: generating a shock wave; and bringing the shock wave into contact with a filter to which a filler adhered, wherein the shock wave is a wave of pressure change that travels at a speed exceeding the sonic speed, the shock wave is generated by pulse discharge using a pair of electrodes or by explosive detonation, in the shock wave contacting step, a pressure applied to the filter by the shock wave is 0.07 MPa or more, and wherein in the shock wave contacting step, the shock wave is brought into contact with the filter under water.

2. The method according to claim 1 , wherein
the filler is at least one selected from the group consisting of titanium oxide, calcium carbonate, talc, silica, montmorillonite, sepiolite, clay, wollastonite, potassium titanate, zonotolite, gypsum fibers, aluminum borate, fibrous magnesium compounds, aramid fibers, carbon fibers, glass fibers, mica, glass flakes, polyoxybenzoyl whisker, zeolite, silver ion-supported zeolite, silica balloons, glass balloons, shirasu-balloons, resin balloons, carbon black, graphite, metal powder, metal fibers, metal foils, carbon nanotubes, ferrite, magnetic iron oxide, samarium cobalt, Nd—Fe—B, aluminum oxide, aluminum nitride, boron nitride, beryllium oxide, barium titanate, lead zirconate titanate, lead, tungsten, stainless steel, barium sulfate, molybdenum sulfide, charcoal powder, glass beads, magnesium oxide, hydrotalcite, antimony oxide, aluminum hydroxide, magnesium hydroxide, zinc borate, red phosphorus, zinc carbonate, dosonite, zinc oxide, iron oxide, calcium oxide, cerium oxide, activated clay, polymeric gel, pigments, polytetrafluoroethylene powder, and silica gel.

3. The method according to claim 1 , wherein the explosive detonation generates the shock wave.

Assignees

• Nagase Filter Co Ltd
• Univ Kumamoto Nat Univ Corp

Inventors

• Eguchi Toshiki
• Shimo Masayoshi
• Hayashi Hideki
• Hokamoto Kazuyuki
• Tanaka Shigeru

Classifications

• B01D41/04

  of rigid self-supporting filtering material · CPC title

• B08B7/02 Primary

  by distortion, beating, or vibration of the surface to be cleaned {(B08B7/0007 takes precedence)} · CPC title

• B08B3/10

  with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration · CPC title

• B08B7/028

  Using ultrasounds · CPC title

• B08B13/00

  Accessories or details of general applicability for machines or apparatus for cleaning · CPC title