Pumps – Expansible chamber type – Valve in collapsible wall pumping member
Patent
1987-07-16
1988-09-13
Smith, Leonard E.
Pumps
Expansible chamber type
Valve in collapsible wall pumping member
417514, 417550, F04B 4306, F04B 4704
Patent
active
047706147
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to pump construction, and more particularly concerns apparatus for transferring fluid media.
BACKGROUND OF THE INVENTION
There is known an apparatus for lifting a liquid from a well comprising a housing formed by a pipe string run into the well. This housing accommodates an actuator in the form of plunger having a non-return valve. The upper part of the housing overlying the plunger communicates through selector valves with an intake line. The plunger is capable of reciprocating inside the pipe for which purpose it is connected through a flexible pull member with a drum the shaft of which is kinematically linked with the shaft of an electric motor (cf., e.g., USSR Inventor's Certificate No. 1,084,419 published in Russian in the Bulletin "Discoveries, Inventions, Industrial Designs, Trademarks" Apr. 7, 1984).
One inherent disadvantage of the above apparatus is failure to deliver a relatively large quantity of the fluid medium with one stroke of the plunger to a relatively long distance, since reliable sealing of the plunger with respect to the housing is virtually impossible. To ensure a high degree of such sealing, the inside surface of the string of pipes needs precise machining, which makes their fabrication too expensive. This prior art apparatus is therefore not sufficiently reliable or efficient, and features a rather short service life.
SUMMARY OF THE INVENTION
The invention aims at providing such an apparatus for transmitting a fluid medium, in which an actuator would be structurally simple to ensure lifting water from any depth in large quantities
The aims of the invention are attained by that in an apparatus comprising a housing with an interior in the top portion thereof communicating through selector valves with the atmosphere and with an intake line, the bottom portion of the housing accommodating a working member or actuator capable of reciprocating relative to the bottom portion of the housing and blocking its cross-section, the actuator having a non-return valve communicating a tank containing a fluid medium with the interior of the housing in the top portion thereof, according to the invention, the actuator with the non-return valve is fashioned as an elastic hose one end of which is hermetically attached to the perimeter of the wall of the bottom portion of the housing, whereas the second end thereof is pivotably connected through link elements equidistantly secured to its perimeter to a flexible pull member extending through the elastic hose and connected to a drive means to ensure that the second end of the elastic hose can move toward the top portion of the housing, this second end of the hose tending to draw together in the course of such movement, the interior of the top portion of the housing communicating with a source of compressed gas to provide the movement of the second end of the elastic hose in the reverse direction.
Preferably, the bottom portion of the housing is longer than the stroke of the elastic hose, and is separated from the tank containing the fluid medium by a filtering element.
Such an arrangement allows to transfer liquids carrying any amounts of contaminants.
Advisably, the bottom portion of the housing is closed, and communicates with the tank containing the fluid medium through a suction valve, a by-pass pipe being preferably provided one end of which is connected through a pressure valve to the intake line, whereas the other end is connected to the bottom portion of the housing in proximity to the suction valve.
This enables an increase in the operation efficiency of the proposed apparatus thanks to dispensing with the idle stroke of the actuator.
Alternatively, the suction valve can be provided with a filtering element.
This arrangement affords to transfer highly contaminated liquids and to periodically wash the filter during the idle stroke of the hose.
Preferably, in a modified form of the proposed apparatus in which the drive means for moving the second end of the elastic hose includes an electric motor
REFERENCES:
patent: 87 (1836-11-01), Card
patent: 508225 (1893-11-01), Knoche
patent: 562285 (1896-06-01), Delpeyrov
patent: 4111616 (1978-09-01), Rankin
Elektrosvyaz, N3, 3/1973, (Svyaz Moscow), G. Z. Aizenberg et al.,"Pnevmaticheskie antenny", p.24, figure 7.
Kryazhevskikh Nikolai F.
Shapovalov Jury P.
Shishkin Viktor V.
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