Device to actuate a pump, in particular a basic pump.

The present invention relates to a device for actuating a pump, in particular, each downhole pump which comprises a two-armed lever, to the essentially horizontal limb being hinged to the rod of the piston of the pump.

Known equipment for operating pumps are generally characterized by background of the trestles on which is mounted a two-armed lever forming a balance. Has one of: branches of this lever is fixed to the piston rod, most often through a circular segment, while its other end is connected, by means of a connecting rod, speed bumps to crank driven positively. In this mechanism, the load fluctuations are compensated by weights attached to the end of the rocker and/or, dynamically, by weights with the crank shaft or by the weight of the crank itself. Such pumps are often used for background the oil production. In this case, it is usually operated continuously, so that static charges are invariable, while the dynamic load always remains constant.

However, when using such an installation with a downhole pump whose operation is intermittent, for example, for pumping water, the height of the water column down during periods of inactivity, due to leakages, in particular, of the foot valve, so that the weight of the colqnne liquid rising above the piston decreases.

Under these conditions, the pendulum ceases to be balanced because its weight has become larger than that of the water column.

At the same time, the dynamic balancing masses are out in the report which is suitable for use with the body of liquid reduced being lifted. Fundamental disadvantages case has the facilities well as the structurally complicated and cost is relatively high.

The present invention etèet goal to avoid said disadvantages and provide a relatively simple device for actuating a downhole pump, preferably, wherein the static and dynamic balancing are made in an extremely simple manner and automatically adjust th columns of liquid of different heights.

The present invention achieves the purpose it is satisfied fixed-that the other branch is oriented essentially vertically downwards and is loaded by a weight.

According to the teachings of the invention, the static and dynamic balancing takes place without a crank drive is required, by one and the same weight. This is achieved by the présenèe essentially vertical leg of the two-armed lever result AuI, together with the weight attached to the end thereof forms a rocker. The static balance is effected merely, automatically, by a change in the rest position of the rocker. As the height of the liquid column which rises above the piston of the downhole pump varies, the substantially vertical leg of the lever extends laterally away from its neutral position, so that the weight appears to be applied to an imaginary lever arm such that the torque resulting exactly compensates the torque imposed by the weight of the liquid column (and, as the case may be, by the piston rod and the piston) on the lever arm substantially horizontal. The weight attached to the substantially vertical leg of the lever can easily be calculated such that even when a large variation in the weight of the liquid column, its deflection brenche vertical, around its neutral position, remains low. Such weight is not distracting to 1' operation because, since it

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is part of a pendulum, maintenance of these movements of oscil " opera ' does not use energy once it has been moved to

in wobbles.

In addition to the adaptation to differences in heights of the column of liquid rising in the pump, the pendular structure of the leg substantially vertical lever also accomplishes a dynamic balancing. Indeed, during pumping, the liquid column rising above the piston is alternately accelerated and decelerated, forces of acceleration and braking being maximum at both ends of the stroke * gold, due to the angular disposition of the two-armed lever driving the piston rod, the weight of the substantially vertical branch thereof is in the high position at each end of its oscillating movement, it is to say, eiffin stroke of the pump, so that it is capable, by returning downward, delivering energy to accelerate the liquid column. Past dead center toward the other side, the weight again accumulates potential energy, while the liquid column is braked. Under these conditions, a dynamic balancing is achieved. It is, however, much obvious, that the energy required for the circulation of the liquid is to be supplied continuously. This is done very simply by corresponding actuation means, for example provided, on the branch lever essentially vertical, and serving to provide manual actuation.

Because of its particularly simple construction, the device of the invention is particularly suited for deep wells simple, manually actuated, for pumping water, but it can also be used for other types of pumps and other purposes where the same problems exist.

According to another feature of the invention, the two arms of the lever are attached to a shaft rotatably mounted about a horizontal axis. Thus, the mounting of the movable members is simplified. It makes sense that this arbae rests on two support bearings spaced, the portion pointing downwards being secured between these bearings, while the essentially horizontal branch extends beyond said shaft bearings. The spacing of the two bearings is insurance against undesirable motions, which is especially useful due to weight often cilia attached to the end of the leg substantially vertical and also because, from its construction, the ISS are two arms of the lever, the preferably, shifted in the direction of their axis of rotation, will allow the weight to oscillate in front of the piston rod.

According to another feature of the invention, the essentially horizontal limb, the shaft and the portion of the substantially vertical leg adjacent the shaft are made of metal, in particular, a metal tube, while the remaining portion of the substantially vertical leg is wood.

Mainly in this embodiment, only the ISS heavily loaded parts of the device are made from metal, while¹ other and, especially, the © Branch of substantially vertical, substantially longer, are in bsiso this realized " except also facilitates the I^O shipping, because the parts of the longest of the rod forming the arm downwardly facing need not Industry shipped, it remains of the an EAR procursr easily on site. Thus, for example, indispensable to the use of bamboo is advantageous for this purpose.

© Iôft reapect® 1 b a® feature⁸ pick-ion, the wooden part of the leg is inserted into the substantially vertical branch consisting of a metal tube. Thus, a single bond is produced between the rod set top rigid wood and tube "

Another feature of 1 'invention provides that the pivot bearings are formed by spaced horizontal supports, in particular, wood, tooth the upper surface has worn® for 1' shafts these carriers can pulls attached to petsstts, ESP sxeaplo, eofepeJs soil that fosasmtretrourni a V whose ends touching to fix the shaft, it is reasonable to either incisions of Sn VBE1 f in the upper face supports ^, incisions in which 1' shaft rotates and quuv it is trapped, or leave the shaft toqrîllonner on each horizontal surface of the holder, in which case, it is sufficient to limit the amplitude of the free movement of eelui-to-eio

1⁵ other features and advantages of the invention shall become apparent from the description which will follow, given solely by way of example will not limitative, with reference to Figure of the attached drawing single which is a schematic view, partially in section, D.^F. an exemplary embodiment of the eio

In reference to the drawing, see a downhole pump having a piston rod 1 to 2 with printed mouvesaentaetionneiaent of vertical reciprocating, as indicated flèsb® 3o

L^has Upper end of the piston rod 2 is connected * by fork 4 and an axis 5, I-the end flattened © 6 of the branch 7, constituted by a tube * D.^O a lever bifurcated tooth 1² another 8 is connected by a tube 9 spanking in which is inserted a rod 10, having at the other end a weight 11₀

The leg 7 "which is integral with a shaft 12" was produced by folding the outer end thereof "the tube 9 is connected to the shaft 12 by a weld"

The shaft 12 is mounted on two supports 13 and 14 respectively fixed to two posts 15 "strip 17 and" 18 "for example, by ligation" the posts 15 to 18 are driven into the ground and rise by forming a V inverted "spacing of the studs 15" and 17 web "18 is determined by cross members 19 and 20 which are connected to the posts 15 to 18" by ligature 21 "on the drawing" a alone ligatures 21 is visible. The posts 15 and 18 I-beams 19 and 20 may be made from wood "for example, bamboo" allowing the use of building materials found on site "

The brackets 13 and 14 can also be made of wood. For securing the shaft 12" incisions 22 V and 23 have been formed in the upper face supports 13 "14 and shaft 12 rotates therein" the incisions 22 and 23 are covered by latches 24 and 25 preventing the shaft 12 from leaving its bearings "the weight 11 prevents the shaft 12 jumping outside cuts 22 and 23 DSS's"

In operation, the weight 11 provides the static balance of the device. At eomæancemsnt pumping " and to measure the liquid column rises above the piston of the downhole pump the I_C. the weight 11 deviates more and more of its little * except rest in the direction of arrow 26 "if the weight 11 is suffisassBsnt heavy" maximum excursion © required balances the weight of the column of liquidated remains fairly low lice that the pendulum formed by the branch 8 and by the weight it can continue to perform its function in DS dynamic balancing.

L⁸ dynamic balancing takes place during movements of d * oscillating. the pendulum, the pendulum oscillations during which accumulates and rendered constantly, I^O energy and is, notammentj in phase opposition to the column of liquid rising in the extraction tube above the pump "

The actuated device, which is needed for extraction of deliberations is accomplished manually, simply by printing the weight 11 rhythmic motion in the direction of arrow 26 or 27" could also operate the device manually by printing to the piston rod 2, a movement in the direction of arrow 3 * remote operation using a target connected to the shaft 10 or the weight 11 is also possible,, in case D.⁸ direct actuation is particularly convenient for providing a rod 28 extending over the cctfi of the shaft 10, between the two posts 17 and 18"

The shaft 12 could also be housed in an enclosure 12j closed on all sides_O of préfêrencs, concrete₀âinsi, all mechanized actuation is protected, much that that t @ tee. or entry well, possibly preventing sand, at risk of damaging or destroying the pump can drop into the ClO instead of a piston rod it is, in principle, also possible with d¹ use a target in the downhole pumps₀ In this case, the horizontal arm center may advantageously be a pulley around which the target can advantageously form multiple turns.