SU73141A1 - Submersible pump - Google Patents

Description

Known deep-seated pumps of plug-in type of single action with a cylinder suspended on rods and a fixed piston, with an annular chamber between their walls are known.

A distinctive feature of the proposed pump is to prevent the pumped liquid from penetrating through the possible gap between the cylinder and the piston into the filling chamber during upward movement of the pump cylinder, for which the annular chamber on the side of the filling chamber is limited by the ring. The diameter of the ring is less than the diameter of the cylinder so that a necessary clearance is formed between them. Through this gap between the two chambers, there is a forced flow of fluid, which forms a hydraulic valve and creates a back pressure in the annular chamber.

FIG. 1 schematically depicts the described pump at the lower position of the cylinder; in fig. 2 - the same, with the upper position.

A fixed piston 2 with a ring 5 pressed in on it is mounted in a sleeve / which fits tightly in the well casing and carries a suction valve 4. The moving cylinder 10 with a ring 3 pressed in it is suspended on rods and provided with a discharge valve 8. Between the walls of the cylinder 10 and a piston 2, an annular chamber 6 is formed, which communicates with the filling chamber 7 through the gap 9. When the pump is immersed in a liquid, chambers 6 and 7 are filled. During the lift of the pump cylinder 10 upward, the volume of chamber 6 decreases, and chamber 7 increases. When fluid from chamber 6 enters chamber 7 through gap U, pressure 6 is created in chamber 6, the value of which depends on the volume of the chamber itself, the size of gap 9 and the number of strokes of cylinder 10 in 1 min.

Thus, the fluid in chamber 6 is displaced into chamber 7. But for this fluid to exit, an obstacle is created in the form of a gap 9, where a hydraulic shutter is formed, thereby creating backpressure in chamber 6. At the same time increases

No. 73141-2 volume of chamber 7, since the volume of fluid flowing from chamber 6 through the gap 9 is several times smaller than the volume of chamber 7, in which a vacuum is created that facilitates opening of valve 4. Chamber 7 is filled with fluid from the well.

As the cylinder moves downward, the valve 4 closes and the discharge valve 8 opens. Chamber 7 is reduced, and chamber 6 is increased. The fluid from chamber 7 through the discharge valve 8 rises upward through the casing. When the cylinder moves up into chamber 7, the liquid flows from the bottom through valve 4 and from chamber 6. During the course down, valve 4 is closed and no liquid leaks into the bottom.

The hydraulic shutter makes it possible to keep the filling ratio of the pump unchanged in time due to the fact that the leakage of the fluid being lifted through the gaps between the cylinder and the piston, forming, for a period of time from abrasion, is excluded.

The abrasion of the cylinder and piston walls in the proposed pump does not affect the filling ratio.

Subject invention

1. Depth pump plug-in type of single action with a cylinder suspended on rods and a fixed piston, with an annular chamber between their walls, characterized in that, in order to prevent the penetration of the evacuated liquid through a possible gap between the cylinder and the piston into the filling chamber during upward movement the cylinder of the pump, the annular chamber on the side of the filling chamber is limited by a ring whose diameter is less than the diameter of the cylinder so that between them a gap of the required size is formed, through which the received the specific flow between the two chambers of a fluid, forming a hydraulic seal and creating back pressure in the annular chamber.