Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1987-08-10
1989-04-11
Freeh, William L.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
13753327, F04B 3910, F04B 2100
Patent
active
048201375
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a well pump and in particular it relates to a pump of the type which is positioned in a well at the end of a string of delivery pipes which convey liquid pumped from the well to an elevated position, in which the pump is actuated by a plunger rod passing up the string of pipes.
It is customary in pumps of this kind to have a barrel which has in it a piston reciprocated by the plunger rod actuated from a windmill or other driving means and to have in the base of the barrel a foot valve which allows liquid to enter the barrel at the appropriate time, and to have within the piston a valve which allows liquid to move upwardly through the piston but not down, so that as the piston is reciprocated, liquid is lifted by the piston on the upstroke with the piston valve closed and the foot valve open, but on the downstroke the piston moves freely through the liquid with the piston valve open and the foot valve closed so that the space above the piston is then filled with liquid for the next lift.
According to an earlier invention of mine, the pumping was achieved by a balance system using fluids to actuate the piston in the pump cylinder, but the present invention is directed to a mechanically actuated pump of the general type described earlier herein.
The object of the present invention is to provide certain improvements to pumps of this type, the object being achieved according to this invention by utilizing a barrel in which a piston is reciprocated by means of a plunger rod, but the piston itself is not provided with valve means but has buckets arranged to prevent the passage of liquid or fluids past the piston, the valve mechanism being situated in an extension at the top of the barrel in which the piston moves, the valves being situated in this extension.
The invention thus comprises a submersible well pump of the barrel and piston type characterised by a valve chamber formed coextensively with the barrel and containing at least an inlet valve and an outlet valve arranged to admit fluid to one end of the barrel on a first stroke of the piston and to discharge the fluid from the same end of the barrel on a second opposite stroke of the piston.
In its preferred form the invention comprises a pump having a barrel adapted to be supported by a delivery type and adapted to be submerged in the fluid to be pumped and comprising a barrel having a piston within it adapted to be coupled by a plunger rod to a reciprocating mechanism and including inlet and outlet flow control valves, characterised in that the flow control valves are positioned in an extension of the barrel coextensive with the barrel and arranged on a first stroke in one direction to cause a flow of fluid into the barrel through the inlet valve to the retreating side of the piston and, at a second stroke in the opposite direction to discharge the fluid from the barrel through the outlet valve to the delivery pipe.
The invention also has reference to a double-acting pump.
To enable the invention to be fully understood embodiments thereof will now be described with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal sectional view of first embodiment of the invention,
FIG. 2 is an enlarged longitudinal sectional view of the valve extension,
FIGS. 3, 4, 5 and 6 are components of the valve mechanism, and
FIG. 7 is a longitudinal sectional view of a second embodiment showing a double-acting arrangement.
Describing first the form illustrated in FIGS. 1 to 6 inclusive, the extension 1 screws to the top of a barrel 2 to be coextensive therewith and this extension 1 has in it intake ports 3 which terminate in which I term a garter-type reed valve 4, that is a valve which is expanded in a chamber 5 in the extension to engage the inner face of the extension over the intake ports 3. This prevents outflow of fluid but allows fluid flow into the chamber 5 when the reed valve 4 contracts into the chamber 5 due to fluid being drawn into the hollow by the piston 6. The fluid flows through the intake port 3 and around the ree
REFERENCES:
patent: 345657 (1886-07-01), Wylie
patent: 555096 (1896-02-01), Hooker
patent: 2628563 (1953-02-01), Coberly
patent: 2743677 (1956-05-01), Fleming
patent: 2765742 (1956-10-01), King
patent: 2902049 (1959-09-01), Ilfrey
patent: 4375946 (1983-03-01), Page
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