WELL ROD PUMPING ASSEMBLY (EMBODIMENTS) Russian patent published in 2020 - IPC F04B47/02 

FIELD: machine building.

SUBSTANCE: invention relates to the field of machine building. Downhole sucker-rod pump unit comprises a fixed part and a rod string connected to the lifting pipe, a movable part of the pump, a drive for transfer of reciprocating or rotary motion to the rod string. Fixed part from above is provided with coaxially installed branch pipe. Check valve is installed above fixed part, check valve seat is arranged in branch pipe. Shut-off element is installed on the lower rod with guaranteed clearance with the possibility of limited axial movement and interaction with the seat. Shut-off element contains the lower support part and the cover, at the same time in one of them there is a blind cylindrical cavity with the sealing unit installed in it. Support part is equipped with stop interacting with cover, check valve arranged in lower part of lifting pipe. Shut-off element is fitted on the rod with a guaranteed radial clearance. Cover is installed with the possibility of the axial movement limited with the additional support relative to the lower support part, which is made in the form of a collar or support surface formed by boring in the upper part of the cylindrical recess of the lower support part.

EFFECT: invention can be used in oil producing industry in borehole sucker-rod pumps.

5 cl, 5 dwg