Patent ID: 11873802
Assignee: GRACO MINNESOTA INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 17:
18. A pump configured to serially compress a gas, the pump comprising:
a first compression stage having a first fluid displacement member, a first stage inlet, and a first stage outlet, the first fluid displacement member configured to reciprocate on a pump axis to alter a volume of a first compression chamber of the first compression stage;
a second compression stage having a second fluid displacement member a second stage inlet and a second stage outlet, the second fluid displacement member configured to reciprocate on the pump axis to alter a volume of a second compression chamber of the second compression stage;
a drive disposed at least partially between the first fluid displacement member and the second fluid displacement member, the drive operably connected to the first fluid displacement member and the second fluid displacement member to displace the first fluid displacement member through a first suction stroke and to displace the second fluid displacement member through a second suction stroke; and
wherein the first compression stage is fluidly connected to the second compression stage such that gas compressed in the first compression chamber in the first compression stage is routed to the second compression chamber;
wherein the first stage outlet and the second stage outlet are disposed on the pump axis; and
wherein each of the first fluid displacement member and the second fluid displacement member have a circular cross-sectional orthogonal to and coaxial with the pump axis.