Pumps – Expansible chamber type – Plural pumping chambers
Patent
1998-03-04
1999-08-17
Thorpe, Timothy S.
Pumps
Expansible chamber type
Plural pumping chambers
4171991, 92 84, 92130C, 92140, F04B 2304
Patent
active
059384166
ABSTRACT:
A liquid transfer pump includes a housing having an inner space, a cross head disposed in the inner space of the housing and attached to a driving mechanism to reciprocate inside the housing, a plunger attached to and held by a plunger holder of the cross head, and a pump head situated near the cross head. The pump head includes a pump chamber with an inlet path and an outlet path, and the plunger is disposed in the pump chamber to be reciprocated therein together with the cross head. A resilient O-ring is disposed in the plunger holder, and a plunger seal is disposed in the pump head, wherein one side of the plunger is engaged with and held by the resilient O-ring and the other side of the plunger is engaged with and held by the plunger seal. Accordingly, the plunger can be flexibly supported by the O-ring and the plunger seal. The plunger seal can be used for a long time without leakage.
REFERENCES:
patent: 4160626 (1979-07-01), Bell
patent: 4197787 (1980-04-01), Schneider
patent: 4627798 (1986-12-01), Thomas
patent: 4790236 (1988-12-01), Macdonald et al.
patent: 5505593 (1996-04-01), Hartley et al.
patent: 5513956 (1996-05-01), Lewis et al.
Kaito Katsuaki
Saito Katsuhiko
Gartenberg Ehud
Shimadzu Corporation
Thorpe Timothy S.
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