US 2211074 A
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Description (OCR text may contain errors)
Aug. 13, 1940. H. H. RAuLERsoN AIR CELL Filed July 29, 1938 lill.
INVENTOR. Hcxr'ch` H. Roulerson ATTOR EY.
Patented Aug. 13, 1.940
UN1TED STATES PATENT oFFlcEf AIR CELL, Haray7H-nau1erson, Long Beacnceuf. Application July 29, lssaserial Nmfzzrsso..
Y ,s claims. (01.10.35.224)
This invention relates to improvements in pump air cells.
vThe general object ofthe invention is to provide an improved air cell which in combination with a reciprocating pump insures a more nearly constant flow than is possible with former equipment. f
Another object of the invention is to provide an air cell which may be sunk in a Well and placed advantageously close tothe piston.
Another object of the invention is vto provide an air cell in which the air therein is automatically replenished.
Another object of the invention is to provide a novel pump construction wherein a plurality of air'cells areemployed. y
Another object of the invention is to provide anair cell in which the air is replenished through a hollow sucker rod. f
Other objects and advantages of my invention will be apparent fromthe following description taken in connection with the accompanying drawing, wherein: f
Fig. 1 is a View of apump wherein an air cell embodying the features ofl my invention is employed;
Fig. 2k isan enlarged' vertical section of the air cell;
' Fig. 3 is a section taken on line 3--3 Fig. 2;
Fig. 4 is a diagrammatic view showing a number of air cells in series; and
Fig. 5 isa vertical section showing a modied air cell.
Referring to the drawing by reference characters I have shown my invention as embodied in an air cell which is indicated generally at Ill. As shown in Fig. 1 the air cell IIJ is used in connection with an ordinary well II, a double action pump I2, a. Well head assembly I4, a sucker. rod l5 and a column IB.
The double action pump I2 is similar to the pump described in my co-pending application, Serial No'. 183,817, led January 7, 1938 and n-` cludes an outer barrel I2a, an inner barrel |25, a piston I2C within the barrel |2b', upper inlet valves I3, a lower inlet valve I3a, an upper inner valve |312, and a lower inner valve |3c. The piston |2c is operated by the sucker rod I5 and as the latter moves up and down the uid is raised during each movement.
As shown in Fig. 2' the air cell IU includes a hollow cylindrical body portion Il having upper internal threads I8 and lowerv internal threads A lower coupling engages the threads I9 and an upper coupling 2| engages the threads I 8. Thecoupling 2| has a reduced portion 22 withlexternal. threads 23 engaging the lower yend of a collar 24 theupper end of which threadedly engages the lower end of the column I6. The couplingl20 has'a reduced portion 25 having ex- 5 ternal threads 26` engaging the upper end of a collar 21 thelower end of which threadedly engages the pump cylinder I2.
`The coupling ZI'has a central bore 28 with lower enlarged portion 29 and a further enlarged 10 portion BIltherebelow. kWithin the enlarged portion 29 is positione'da hollow cylinder 3| vcoaxial with the bodyportion I7 and forming an annular chamber 32 therewith. The cylinder 3| is preferably secured to the coupling 2| asby welding and 15* is further supported by' a spider 33 having a centralring v:i4 vengaging the cylinder 3| and a plurality of radial legs 35 engaging the body por' tion II. -The coupling 20 has a central bore 33 having: anY upper enlarged portion 3l. rod I5 passes axially through the cell I0.
Itzvvill be seen that in operation the water'or other iiuid being pumped will rise through the hollow cylinder I'I and will partially ll the annular chamber 32, air or other gases being trapped therein. .l The gases will have a beneficial cushioning effect producing a constant flow of water, and being adjacent the'pump cylinder I2 will be particularly effective in producing a smoothly performing pump.
The trapped air or gases will, however, in time be dissolved in the Water or other fluid and will need to be replenished. To this end I provide conduit means connected to an automatically controlled supply of compressed air or other gases. n
As shown in Figs. 1 and 2 a conduit 4U communicates with the chamber 32 through an aperture 4| in the coupling 2 I. The conduit 40 passes upwardly from the cell Il) through the well II 40 and at its upperv end is connected to a compressed air reservoir 42 through a control system 43. The reservoir 42 may be charged by an ordinary compressor I4 driven by suitable means such as an electric motor 45.
The control system 43 includes a pressure gauge 46, a pressure operated electrical switch 4l and an electrically operated valve 48. When the pressure within the chamber 32 drops below a 50 predeterminedlimit, dependent upon the working head, the pressure operated switch 4l is closed which in turn opens the electrically operated.l valve 48 so the air or other gas is fed to the chamber 32 until the pressure in the chamber 32 55 The sucker 20y is built up sufficiently to open the switch 41 and thus cause the valve 48 to be closed.
As shown diagrammatically in Fig. 4 a plurality of air cells ID may be introduced into the column I6 at diierent depths being connected in series to the air supply conduit 40'. Reducing valves 49 are disposed between the cells ID (except the lowest cell) and the conduit 40, as the pressure within eachvcell is a function of the depth, `the lower cells requiring greater pressure than the upper. 'I'he cells in this arrangement would be used with an air reservoir 42 and a control valve 48' similar to the reservoir and` valve previously described. The Valve 48 is preferably operated by air pressure in the lowest cell.
In Fig. I have shown a modification of my invention as embodied in a cellindicated generally at 50. The cell 50 includes a hollow cylindrical body portion 5|, an upper coupling 52, and a lower coupling 53, these couplings being similar to the couplings previously described. Centrally positioned within the body 5| I provide a hollow cylinder 54 supported by spiders 55 similar to the spider 33. The cylinder 54 is longer than the pump stroke and has a gland 56 at the upper end thereof through` which a hollow sucker rod 51 passes. The sucker rod 51 has radial apertures 58 opening therefrom into the interior of the cylinder 54. In operation the cell 50 is used in a well as is the cell l0, the iiuid flowing through the annular passage between the body portion 5l and the cylinder 54, air being trapped within the cylinder 54 and replenished by means of the hollow sucker rod discharging through the apertures 58. The sucker rod 51 is connected by a flexible conduit 59 to a control system 6U similar to the control system 43.
From the foregoing description it will be apparent that I have invented new and useful improvements in air cells for pumps.
Having thus described my invention I claim:
1. In a pump construction having an elongated casing including a plurality of members, a sucker rod in said casing, said casing including a plurality of cells, said cell being distributed along said casing, each of said cells including an elongated body having a cylinder therein, said cylinder forming with the body a chamber which has a closed tcp portion and an open lower portion, said sucker rod passing through said casing and through said cylinders and means controlled by gas pressure in the lowest cylinder to supply gas under pressure to the upper portion of each of said cylinders.
2. In a pump construction having an elongated casing includinga plurality of members,a sucker rod in said casing, said casing including a. plurality of cells, said cells being distributed along said casing, each of said cells including an elongated body having a cylinder therein, said cylinder forming with the body a chamber which has a closed top portion and an open lower portion, said sucker rod passing through said casing and through said cylinders, means to supply gas under pressure to the upper portion of each of said cylinders, conduit means to supply gas to each of said cylinders including a source of uid under pressure, a valve actuated by gas pressure in the lowest cell for controlling communication between said source and said cells and pressure reducing means associated between said conduit and all of said cells above the lowest cell.
3. In a pump including a casing, a sucker rod in the casing and means in the casing operated by said sucker rod for raising fluid, saidcasing having a plurality of air cells therein, each of said air cells including an outer body with a cylinder mounted in said outer body, the cylinders each engaging the outer body` at the upper end and being free from engagement with the outer body at its lower end, said cylinders being spaced from said outer body to form an annular gas cell, said sucker rod being spaced from said cylinders, means adjacent the lower end of the cylinders and engaging the body to support the cylinders, conduit means communicating with the upper portion of each of the cylinders and adapted to supply gas under pressure to the cylinders, means to supply gas under pressure to the conduit means and valve means controlled by the pressure of gas in the lowest cell for controlling the flow of gas to each cylinder.
vHARDY H. RAULERSON.