Patent ID: 11931681
Assignee: DONALDSON COMPANY, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 16:
17. A filtering system comprising:
a housing comprising a tube sheet separating the housing into a dirty air chamber and a clean air chamber;
an aperture in the tube sheet, wherein air passing from the dirty air chamber into the clean air chamber passes through the aperture;
a pulse generator positioned to deliver pulses of air through the clean air chamber and into the aperture in the tube sheet, wherein the pulse generator is configured to deliver the pulses of air along a pulse axis that extends from the pulse generator through the aperture in the tube sheet, wherein the pulse generator comprises a pulse outlet located on the pulse axis, the pulse outlet defined by opposing walls that do not diverge with respect to the pulse axis, and wherein the pulse outlet defines a pulse outlet hydraulic diameter;
a pulse collector defining a passageway that extends through the pulse collector from a filter end opening at a filter end of the pulse collector to a tube sheet opening at a tube sheet end of the pulse collector, wherein the tube sheet end of the pulse collector is attached to the tube sheet such that the tube sheet opening of the pulse collector is aligned with the aperture such that the pulse axis extends through the filter end opening and the tube sheet opening of the pulse collector, wherein air passing from the dirty air chamber into the clean air chamber through the aperture in the tube sheet must pass through the passageway of the pulse collector from the filter end opening to the tube sheet opening; wherein the pulse collector comprises a filter section and a pulse section, wherein the filter section and the pulse section meet at a junction located between the filter end opening and the tube sheet end opening of the pulse collector; and
a filter element attached to the filter end of the pulse collector such that a junction between an end of the filter element and the filter end of the pulse collector is located in the dirty air chamber;
wherein a pulse distance measured along the pulse axis from the pulse outlet to the filter end opening is 30 or more times and 60 or less times the pulse outlet hydraulic diameter;
wherein the filter section comprises a filter section length measured along the pulse axis from the filter end opening to the junction and the pulse section comprises a pulse section length measured along the pulse axis from the tube sheet end opening to the junction;
wherein the pulse section length is equal to or less than 1.5 times a hydraulic diameter of the filter end opening of the pulse collector;
wherein the filter section length is equal to or less than the hydraulic diameter of the filter end opening of the pulse collector;
and wherein the passageway defined by the filter section comprises a hydraulic diameter that remains constant when moving along the pulse axis from the junction to the filter end.