Pumps – Successive stages – Reciprocating rigid stages
Patent
1994-06-24
1996-11-26
Freay, Charles G.
Pumps
Successive stages
Reciprocating rigid stages
417525, 417534, 417546, 417549, 417553, F04B 300
Patent
active
055778968
ABSTRACT:
An object of the present invention is to provide a pump which suppresses a decrease in the volumetric efficiency of the pump to a great extent even in case that the kinematic viscosity of a fluid is high with a compact structure of the pump itself. The present invention, a pump provided with a first pump mechanism and a second pump mechanism comprises a housing having therein a first pump chamber, a second pump chamber, an intake port communicated with the first pump chamber, and a discharge port communicated with the second pump chamber, first valve means which open the communicating passage when the second pump chamber is compressed and close the communicating passage when the second pump chamber is expanded, a piston which expands the second pump chamber when the first pump chamber is compressed, and compresses the second pump chamber when the first pump chamber is expanded in accordance with movement thereof, second valve means which open so as to permit fluid to flow into the first pump chamber when the first pump chamber is expanded and close so as to prevent fluid in the first pump chamber from flowing out of the first pump chamber when the first pump chamber is compressed, and third valve means which open so as to discharge pressurized fluid in the second pump chamber when the second pump chamber is compressed and close when the second pump chamber is expanded.
REFERENCES:
patent: 176330 (1876-04-01), Malmquist
patent: 759514 (1904-05-01), Grant
patent: 898659 (1908-09-01), Kuehl
patent: 1653562 (1927-12-01), Grimley
patent: 4338066 (1982-07-01), Luker
patent: 4988147 (1991-01-01), Zirps
patent: 5320498 (1994-06-01), Fuchida
patent: 5395219 (1995-03-01), Hosoya et al.
Freay Charles G.
Nippondenso Co. Ltd.
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