Positive displacement metering pump

Details Positive displacement metering pump Positive displacement metering pump

1975-09-08

1977-03-22

Freeh, William L.

Pumps

Expansible chamber type

Control by withdrawal or tilting of pump piston relative to...

92168, 417900, F04B 704

Patent

active

040133869

ABSTRACT:
A metering pump including a pump body having a bore for receiving a flowable composition to be dispensed, feed inlet means communicating with the bore, and spaced outlet means including a check valve, for discharging the composition. A pressure chamber is defined intermediate the pump inlet and outlet. The chamber has an inlet, and an outlet communicating with the pump outlet through the check valve. A piston is mounted for axial reciprocation in the bore between a first position at which the piston is withdrawn from the pressure chamber inlet, and a second position at which the piston passes at least partially into such inlet. The pressure chamber inlet is bounded by sealing means including an annular sealing surface which converges in the direction of the pressure chamber, to a diameter less than that of the piston, whereby the surface may slideingly engage and seal with the piston upon the latter entering the pressure chamber. The sealing surface is elastically dilateable away from the axis of the bore, to maintain the seal about the piston during its entry and withdrawal from the pressure chamber and to enable compensation for wear. At least one other surface of the sealing means is accessible to the pressure chamber interior, and is elastically coupled to the backside of the sealing surface. In consequence, the increasing pressure developed by movement of the piston into the pressure chamber, acting through the accessible surface, increases the sealing forces between the sealing surface and piston.

REFERENCES:
patent: 1771596 (1930-07-01), Victor
patent: 2212138 (1940-08-01), Wright et al.
patent: 2569903 (1951-10-01), Santarelli
patent: 2997318 (1961-08-01), Lansky et al.
patent: 3022097 (1962-02-01), Seniff et al.
patent: 3199831 (1965-08-01), Sully
patent: 3233554 (1966-02-01), Huber et al.
patent: 3318251 (1967-05-01), Smith
patent: 3675933 (1972-07-01), Nappe
patent: 3802805 (1974-04-01), Roeser
patent: 3913460 (1975-10-01), Wright

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