Apparatus for intermittent transfer of fluid

Details Apparatus for intermittent transfer of fluid Apparatus for intermittent transfer of fluid

F - Mech Eng,Light,Heat,Weapons

04

D

F04D 9/02 (2006.01) F04C 13/00 (2006.01) F04D 7/02 (2006.01) F04D 9/00 (2006.01) F04D 13/08 (2006.01)

Patent

CA 2129468

APPARATUS FOR INTERMITTENT TRANSFER OF FLUID ABSTRACT OF THE DISCLOSURE Fluid transfer apparatus comprising a fluid reservoir and a pump connected to the reservoir by a supply line, wherein the apparatus is configured so that vapor generated in the pump during periods of inopera- tion may escape from the pump cavity through the pump inlet, rather than being trapped in the pump cavity, and liquid may flow into the pump cavity from the supply line through the pump inlet to replace escaping vapor, thereby providing reliable pump start-up during inter- mittent operation. The apparatus may be employed to pump LNG for fueling of vehicles. Where LNG or another cryogenic fluid is being pumped, the pump is preferably driven by a motor located above the pump and connected thereto by an elongated shaft. Shaft seals may be provided to prevent the fluid being pumped from contacting the motor or the bearings supporting the motor shaft. A vapor trap may be provided beneath the shaft seals to prevent contact between liquid being pumped and the shaft seals.

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