Patent Application
20220042400
The invention relates to the oil producing industry and, in particular, to a sucker-rod pumping unit for fluid withdrawal, and may be used in other industrial and agricultural sectors.
RU 2278994 (25 Oct. 2004) discloses a drive for a deep-well sucker-rod pumping unit. The drive comprises a motor, a gearbox, an assembly consisting of two pitman arms, at least one pinion and two central wheels. The at least one pinion and one of the central wheels or the two central wheels are coupled to the pitman arms, and the pitman arms having other ends coupled through a walking beam to the deep-well sucker-rod pumping unit or directly to sucker-rods. This drive is insufficiently reliable and long-lived.
RU 2463479 (28 Dec. 2009) discloses a drive for a deep-well sucker-rod pumping unit. The drive comprises a motor coupled directly or through a gearbox to a differential comprising at least one pinion and two wheels. The drive comprises at least one further differential. Each differential has an output shaft and a housing fixedly coupled to a crownwheel. The output shaft and the housing of each differential are coupled to cranks and pitman arms. The main drawback of such a drive is its insufficient kinematics that restricts its use.
The present utility model is intended for solving the problem of how to modify the drive design such that it provides improved kinematics, thereby extending the range of use of the drive.
The problem above is solved by a drive for a deep-well sucker-rod pumping unit, which comprises an electric motor coupled through an intermediate gearbox to differentials comprising pinions and wheels, each differential having an output shaft and a housing fixedly coupled to a crownwheel. The housing of each differential, which is fixedly coupled to the crownwheel, is coupled through a crank to a pitman arm. Furthermore, the pitman arms coupled to the cranks fixedly coupled to the crownwheels are coupled through yokes to an equalizer on a walking beam. The pinions of the differentials engage the output shaft of the central gearbox.
The technical result provided by the above-indicated set of features is an improvement of kinematics that allows extending the range of use of the drive due to the coupling of the housing of each differential, which is fixedly coupled to the crownwheel, through the crank to the pitman arm.
A drive for a deep-well sucker-rod pumping unit comprises a Samson post 1, a walking beam 2, sucker-rods 3, an electric motor 4 coupled to a central gearbox 5 through a belt gear 6. An output shaft 7 of the central gearbox 5 engages pinions 8 of differentials 9 generating reciprocating motions at a different speed of opposite strokes. Output shafts 10 of the differentials 9, which are present on either side of the central gearbox 5, have cranks 11 installed thereon. The cranks 11 are coupled to pitman arms 12 that are coupled to an equalizer 13. Housing parts 14 fixedly attached to crownwheels 15 have cranks 16 installed thereon. The cranks 16 are coupled to pitman arms 17 coupled to the equalizer 13 by means of yokes 18.
The drive for the deep-well sucker-rod pumping unit operates as follows.
The electric motor 4 rotates, through the belt gear 6 and the output shaft 7 of the central gearbox 5, the differentials 9 that generate the reciprocating motions of the walking beam 2 at a different speed of opposite strokes via the cranks 11, 16 and the pitman arms 12, 17. A rotation torque transmitted from the crownwheels 15 to the cranks 16 and further to the pitman arms 17 allows significantly increasing the stroke of the pitman arms 17 and, therefore, the rotation angle of the walking beam 2. This allows for an increase in the stroke length of the sucker-rods 3, thereby improving the kinematics and extending the range of use of the drive.
The present drive for the deep-well sucker-rod pumping unit may be fabricated by using standard equipment, familiar materials and familiar techniques.
