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1. (WO2018044857) HIGH PRESSURE FUEL GAS PUMP

Pub. No.:    WO/2018/044857    International Application No.:    PCT/US2017/049058
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed Aug 30 01:59:59 CEST 2017
IPC: F04B 15/08
F04B 11/00
F04B 23/02
F04B 9/02
F02M 21/02
B63H 21/38
Applicants: ACD, LLC
Inventors: WELLS, Michael
Title: HIGH PRESSURE FUEL GAS PUMP
Abstract:
A system for pumping high-pressure cryogenic fuel comprises: a plurality of linear pumps (22) each including an upper power end (30) and a lower fluid end (32), the power end having a linear-actuated drive system terminating in a drive shaft (120) and being independently controllable by an electronic controller; the fluid end having a piston (94) coupled to the drive shaft so as to linearly reciprocate within a cylinder; the piston having a head (92) with a plurality of piston rings (98); an inlet passageway (80) leading from an inlet tank (52) to a lower end of each cylinder and into valved communication with a head space just below the head of the piston, wherein upward motion of the piston creates a negative pressure gradient in the head space sufficient to allow high-pressure fuel into the head space, and downward motion of the piston expels high-pressure fuel through a lower flow passage and into an outlet port common to all of the cylinders; and a sealed housing (24,26) disposed around the linear pumps to contain any leakages of high-pressure cryogenic fuel. The operation of the system includes coordinated actuation of the separate linear pumps (22) to result in a pulse-free output pressure profile.