Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1994-08-04
1995-04-04
Bertsch, Richard A.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417571, 277 59, 277164, 277205, F04B 2100, F16J 1532
Patent
active
054031699
ABSTRACT:
In a plunger pump having a pump chamber delimited by a cylinder and a plunger reciprocating in the cylinder, and a first seal member provided between an inner surface of the cylinder and an outer surface of a plunger to prevent a liquid in the pump chamber from leaking to the outside, the inner surface of the cylinder and the outer surface of the plunger are out of sliding contact with each other, and a second seal member is interposed between the first seal member and the pump chamber. During a suction stroke, the second seal member is in sliding contact with the outer surface of the plunger to prevent dust, which is produced as the result of wear, from flowing to the pump chamber from the first seal member side. During a discharge stroke, a minute gap is formed between the second seal member and the outer surface of the plunger. A first discharge system is provided between the second seal member and the first seal member for discharging to the outside any liquid flowing from the pump chamber past the second seal member. The pump liquid is thus prevented from being contaminated with the dust.
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Minami Yoshio
Yokoi Keiji
Bertsch Richard A.
Ebara Corporation
McAndrews, Jr. Roland G.
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