Pumps – Processes
Patent
1978-09-28
1984-07-03
Freeh, William L.
Pumps
Processes
417203, F04B 2310
Patent
active
044576706
ABSTRACT:
A preferred method includes pumping extrudable and compressible lubricant storage and wicking material from a supply hopper and into a supply conduit wherein passive valve means are utilized so that material is automatically supplied to a pump mechanism from the hopper and automatically prevented from being urged back into the supply hopper while the material being pumped is being forced out of a pumping chamber. In a most preferred form, the method includes utilizing pressure differentials established by the pump means to control the valving action of a valve or flow control member that is interposed between a pumping chamber and a supply hopper.
Apparatus embodying the invention in one preferred form includes means for rotating an auger as well as stirring rods (if so desired), and means for operating a reciprocating positive displacement pump in a pump chamber which is supplied with material from the continuously rotating auger. The preferred apparatus includes passive valve means which may be in the form of a check valve, a single reed valve, or a double reed valve which is illustrated herein as a double flapper valve. In an embodiment of the invention illustrated herein, a positive pressure is applied to one side of the passive valve means by a feed auger and the other side of the valve means is exposed to an intermittently varying pressure caused by reciprocation of piston means that form part of a positive displacement pump. The alternately high and low pressure gradient across the passive valve means causes material to intermittently flow into a pumping chamber from the supply hopper and then to flow into a discharge conduit rather than being forced back into the hopper.
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Bohde Richard C.
Tomson James M.
Freeh William L.
General Electric Company
Krisher, Jr. Ralph E.
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