Pumps – Expansible chamber type – Plural pumping members in single pump chamber
Patent
1995-11-13
1998-06-23
Freay, Charles G.
Pumps
Expansible chamber type
Plural pumping members in single pump chamber
417487, 92138, F04B 1900
Patent
active
057696160
DESCRIPTION:
BRIEF SUMMARY
SUMMARY AND BACKGROUND OF THE INVENTION
The present invention relates to a submerged pump with coaxial opposing modular pistons, operated by double eccentric cams or similar, of the kind that may also be applied to wells having small diameters, so as to absorb moderate power but having a high efficiency for high pressures.
At present, submerged pumps of the centrifugal kind are known which have good efficiency, but may not be built, if the requested pressures are high, for powers below a determined practical threshold (500-700 Watt).
For high pressures with smaller powers it has consequently proved necessary to make use of volumetrical pumps; however, these pump are not manufactured at a size that might be submerged in a well, although some have tried without success, due to the excessive complications and the fragility thereof.
It is the aim of the present invention to realize a submerged pump having low power and high efficiency, for high pressures.
The aim set forth is reached by means of the submerged pump according to the present invention, comprising one or more modular pumping groups, each consisting of a couple of balanced, coaxial and opposing pistons on spool wheels with a spring return.
Said pumping groups according to the present invention are operating in a parallel manner onto one and the same working or pumping chamber communicating with non-return valves, one for suction and one for outlet, and they may be piled up, and engaged together with, for instance, tie-rods, in a greater or smaller number, thus obtaining differentiated capacities and powers.
According to the aim of the present invention, the pistons have a large diameter and a small run, and their sealing is determined by elastomeric, flexible membranes resting on bevels that guarantee their functioning also in presence of great pressures.
In a similar manner, the valves of the pump are realized with elastomeric flexible membranes onto small slits that are functional also under great pressures.
The submerged pump according to the present invention has the following considerable and many advantages: shape, suited for being submerged also in wells having a small diameter; with low power.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be described more in detail hereinbelow relating to the enclosed drawings in which a preferred embodiment is shown.
FIG. 1 shows a vertical scheme of a submerged pump with coaxial, opposing and modular pistons operated by double eccentric cams.
FIG. 2 shows a section 2--2 of FIG. 1.
DETAILED DESCRIPTION OF THE DRAWINGS
The enclosed figures show a submerged pump according to the present invention, having a preferably cylindrical structure, consisting of:
An operation shaft A provided with opposing double eccentric cams 5 rotationally disposed within the structure. One or more modules each consists of pistons 7 provided with seals or preferably ring-shaped diaphragms 8, a wheel 10, pivoting pins 11, return springs 12, external bushings 13 and piston-carrying blocks 9 provided with a ball bearing 4. The return springs 12 are placed between the external bushings 13. The wheels 10 and pins 11 are placed on the pistons 7 between the pistons 7 and the cams 5 of shaft A. The plurality of modules are stacked coaxially along shaft A and fastened by means of assembling tie-rods 6. A segment 1 having a lower block 2 provided with sealing 3 and ball bearing 4 engages the shaft A and an upper cover 14 covers the modules. The rotation of shaft A determines which one of the cams 5 engage the respective module through wheel 10 and return springs 12. The reciprocating 7 caused thereby, which is sealed due to the presence of the seals or annular membranes 8, and due to their considerable surface, also for small movements, and the high rotation speed of shaft A, pressures and depression in working (pumping) chamber 16 is realized. Following openings and closings of the valves with elastomeric membranes 17 and 20 permit the pumping of the water in accordance with the aim set forth.
It shall be underlined
REFERENCES:
patent: 2784676 (1957-03-01), Woodward
patent: 4322201 (1982-03-01), Archibald
patent: 4569643 (1986-02-01), Draper
Cefis Giovanni
Mencarelli Enzo
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