Pumps – Motor driven – Fluid motor
Patent
1987-08-31
1989-04-18
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
F04B 4310, F04B 4704
Patent
active
048222577
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present application relates to a pump arrangement which is particularly intended for raising water from deep wells and in which a feed pump unit located at ground level transmits power and motion to a water delivery pump unit so that during a working stroke of the pump, water is raised from a well bore to the mouth of a delivery pipe which is connected to the water delivery pump unit via a pressure valve, and in which arrangement water flows into the delivery pump unit during a return stroke of the pump through a well-water inlet connected to the delivery pump unit via a suction valve.
BRIEF DESCRIPTION OF THE PRIOR ART
Present day water pumps most often have the form of piston pumps, the pistons of which are located in the bottom of the well and connected through a draw rod to an auxiliary drive means located at ground level. Piston pumps intended for deep wells are heavy and cannot be readily handled. Furthermore, such pumps can be expensive to transport and to install. Since it is difficult to drill a truly vertical well hole, it is either necessary to overdimension the mouth of the well when using piston pumps, or to provide complicated guide means for the drill with which the well is bored, in order to ensure that the draw rod will be able to execute an essentially vertical reciprocating movement. Both of these measures are highly expensive.
It is also known to use in the present context compressible and expandable chambers which are lowered into the wall and which are connected through pressure conduits to an auxiliary activating device located at ground level. U.S. Pat. No. 4,008,008 teaches a pump of this kind, in which the auxiliary activating device for compressing and expanding the aforesaid chambers comprises a piston-type feed pump. It is necessary to install the feed pump in a readily accessible location so that seals can be easily replaced and the hydraulic system replenished with hydraulic fluid, as fluid is lost through seepage. In hot climates the hydraulic fluid present in the pump housing will therefore be exposed to high ambient temperatures, and there is a subsequent risk that when cooled during a pumping operation the hydraulic fluid will decrease in volume to an extent such as to render it difficult to maintain the working pressure desired.
It is also known to use compressed-air pumps and electrically-operated pumps in deep water wells. Such pumps, however, require access to external power sources, which may be an inconvenient requirement, particularly when working in the developing countries.
Since the lack of water is greatest in the developing countries, where the ground water is often located far beneath the surface of the ground, it is here that the greatest need for deep water wells is to be found. Because of the poor economy of developing countries, the cost factor is often totally decisive as to whether a well can be constructed or not.
In order for a deep water well to be constructed cheaply, it is necessary to use a pumping facility of such construction as to enable a drill hole of small dimensions to be used, and also to permit deviations from the vertical.
Furthermore, it should be possible to operate the pump arrangement manually, partly because the installation of auxiliary power sources and the transportation of fuel thereto often represents an insurmountable expense, and partly in order to keep care-and-maintenance work and repair work down to a minimum and to avoid the need for skilled maintenance personnel.
SUMMARY OF THE INVENTION
The present invention relates to a pump arrangement which while fulfilling all of the aforesaid requirements is not encumbered with the drawbacks found with manually operated piston pumps.
This object is achieved with a pump arrangement wherein the driving power is transmitted through a hydraulic line so that the need to drill the hole in which the pump arrangement is installed truly vertically is greatly decreased. Furthermore, lightweight plastic pipes can be used, thereby greatly reducing the cos
REFERENCES:
patent: 3065784 (1962-11-01), Thompson
patent: 3440970 (1969-04-01), Wagner
patent: 3507583 (1970-04-01), James
patent: 3937599 (1976-02-01), Thureau et al.
patent: 4008008 (1977-02-01), Vergnet
patent: 4257751 (1981-03-01), Kofahl
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