US 11,806,672 B2
Method for cleaning a filter element and a filtering device
Simo Aho, Ojakkala (FI); and Ville Hakala, Espoo (FI)
Assigned to Sofi Filtration Oy, Espoo (FI)
Appl. No. 16/978,912
Filed by Sofi Filtration Oy, Espoo (FI)
PCT Filed Mar. 1, 2019, PCT No. PCT/FI2019/050166
§ 371(c)(1), (2) Date Sep. 8, 2020,
PCT Pub. No. WO2019/170958, PCT Pub. Date Sep. 12, 2019.
Claims priority of application No. 20185214 (FI), filed on Mar. 8, 2018.
Prior Publication US 2020/0406198 A1, Dec. 31, 2020
Int. Cl. B01D 65/02 (2006.01); C02F 1/44 (2023.01); B01D 29/66 (2006.01)
CPC B01D 65/02 (2013.01) [C02F 1/444 (2013.01); B01D 29/66 (2013.01); B01D 2321/2075 (2013.01); B01D 2321/40 (2013.01); C02F 2303/16 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for cleaning a filter element made of a porous material, the method comprising:
directing, by an ultrasonic element, ultrasound to the filter element, wherein the ultrasonic element is inside the filter element, and
directing, after a predefined time from starting of the ultrasound, an impulse to a filtrate reservoir causing filtrate inside the filtrate reservoir to be forced inside the filter element in order to remove particles from the surface of the filter element, wherein pressure of the impulse is between 4 to 8 times higher than the forward pressure, and the reverse flux, measured in volume per area time, caused by the impulse is at the minimum 2 to 8 times the feed flux.