US 12,469,478 B2
Revolving valve for feeding air pulses to a resonance tube for generating low-frequency sound and a method for feeding these pulses in an optimal way
Mats Olsson, Lidingö (SE)
Assigned to Tallstam AB, Bromma (SE)
Appl. No. 18/275,541
Filed by Tallstam AB, Bromma (SE)
PCT Filed Feb. 1, 2022, PCT No. PCT/EP2022/052362
§ 371(c)(1), (2) Date Aug. 2, 2023,
PCT Pub. No. WO2022/167425, PCT Pub. Date Aug. 11, 2022.
Claims priority of application No. 2130031-4 (SE), filed on Feb. 2, 2021.
Prior Publication US 2024/0127779 A1, Apr. 18, 2024
Int. Cl. G10K 9/04 (2006.01); F16K 5/04 (2006.01)
CPC G10K 9/04 (2013.01) [F16K 5/0407 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for feeding pressurized air pulses to a rear end of a quarter wave resonance tube for generating a standing low-frequency sound wave in said quarter wave resonance tube, the method comprising:
feeding pressurized air through at least one through hole of a revolving valve consisting of a stationary outer cylinder and an inner revolving cylinder,
wherein, as the inner cylinder revolves, pressurized air passes through said at least one through hole during time intervals of the oscillation cycles of said standing low-frequency sound wave when the air pressure in said rear end of the quarter wave resonance tube is positive, and pressurized air is blocked from passing through said through hole during the time intervals of the oscillation cycles of said standing low-frequency sound wave when the air pressure in said rear end of the quarter wave resonance tube is negative, thereby supplying maximum input power to said standing low-frequency sound wave.