Pumps – Expansible chamber type – Having pulsation dampening fluid receiving space
Patent
1987-10-13
1989-04-18
Freeh, William L.
Pumps
Expansible chamber type
Having pulsation dampening fluid receiving space
417559, 921697, F04B 3908, F04B 1100
Patent
active
048222615
ABSTRACT:
An inner cylinder and a substantially larger outer cylinder are joined as two verticle concentric cylinders. Verticle partitions between the cylinders divide the space between the cylinders into an inlet chamber and an outlet chamber which is substantially larger in volume than the inner chamber. The inner cylinder has a central pumping section positioned between upper and lower valve sections. In the valve section ports extend through the inner cylinder wall to the inlet and outlet chambers. Spring loaded valves close the ports. Tension springs extend across the inlet chamber and compression springs extend across the inner cylinder to close the inlet valves. Tension springs extend across the inner cylinder the close the outlet valves. The elastomeric valve flaps have rigid curved backing members. A piston rod extends through one end cover to move a piston in the central section. An inlet is connected to the inlet chamber and an outlet is connected to the outlet chamber.
REFERENCES:
patent: 33323 (1861-09-01), Van Camp
patent: 40239 (1863-10-01), Budd
patent: 85063 (1868-12-01), Brown
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patent: 555096 (1896-02-01), Hooker
patent: 1119801 (1914-12-01), Brigel
patent: 1871577 (1932-08-01), Babin
patent: 2938495 (1960-05-01), Hinton
patent: 4203354 (1980-05-01), Cunningham
patent: 4495772 (1985-01-01), Furuta et al.
patent: 4699574 (1987-10-01), Avery
Avery Don E.
Young Bryan F.
Creighton Wray James
Freeh William L.
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