US 11,939,971 B2
Four-cylinder diaphragm pump
Yuji Ikedo, Saitama (JP)
Assigned to SIBATA SCIENTIFIC TECHNOLOGY LTD., (JP)
Appl. No. 17/431,555
Filed by SIBATA SCIENTIFIC TECHNOLOGY LTD., Saitama (JP)
PCT Filed Dec. 26, 2019, PCT No. PCT/JP2019/051187
§ 371(c)(1), (2) Date Aug. 17, 2021,
PCT Pub. No. WO2020/170605, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 2019-027607 (JP), filed on Feb. 19, 2019.
Prior Publication US 2022/0136495 A1, May 5, 2022
Int. Cl. F04B 43/073 (2006.01); F04B 43/00 (2006.01); F04B 43/02 (2006.01); F04B 45/04 (2006.01)
CPC F04B 43/0736 (2013.01) [F04B 45/043 (2013.01); F04B 43/0045 (2013.01); F04B 43/025 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A four-cylinder diaphragm pump comprising: a pump body having four pump chambers; and a drive mechanism that expands and contracts the four pump chambers with a predetermined phase difference, the pump body including a first diaphragm having two diaphragm portions on a same plane, and a second diaphragm having two diaphragm portions on a same plane disposed parallel to the plane of the first diaphragm, each of the diaphragm portions of the first diaphragm and the second diaphragm constituting a portion of a different pump chamber of the four pump chambers, and the drive mechanism including a drive source having a rotation shaft extending parallel to each plane of the first diaphragm and the second diaphragm, a first oscillating body corresponding to the first diaphragm, and a second oscillating body corresponding to the second diaphragm, each of the two diaphragm portions of the first diaphragm and the second diaphragm separated from each other in a direction orthogonal to the rotation shaft with the rotation shaft as a boundary, each of the first oscillating body and the second oscillating body including an eccentric portion attached to the rotation shaft, an attachment portion attached to the eccentric portion via a bearing, a first arm portion extending from the attachment portion to one diaphragm portion of the two diaphragm portions, and a second arm portion extending from the attachment portion to an other diaphragm portion of the two diaphragm portions, the first diaphragm and the second diaphragm are disposed to face each other so as to be parallel to each other via the rotation shaft, and the eccentric portion of the first oscillating body and the eccentric portion of the second oscillating body are eccentric in the same direction.