WELL ROD PUMP Russian patent published in 2009 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: proposed device is designed to be used in oil production. The well rod pump comprises a cylinder, a plunger coupled with the rod arranged inside the pump pipe, an intake and discharge valves. The intake valve represents a ball fitted in the valve body. A tight bottom cylinder is furnished with a sleeve fitted coaxially and with a gap therein. The said cylinder is tightly flange-connected to a circular ledge made on the outside lateral wall and the sleeve top. The sleeve length is smaller than that of the cylinder, while the sleeve top end is tightly jointed to the pump pipe. The said circular ledge is furnished, for example with two ball-like pressure valves each seating in a through hole, the said holes being arranged on the circular ledge opposite the space between the opposite cylinder and sleeve lateral walls. The plunger represents a circular piston fitted in circular space between the opposite cylinder and sleeve lateral walls. The circular piston is linked up with the rod by means of a hollow con-rod fitted coaxially with the circular piston and attached to its bottom end face. The said hollow con-rod lower end face has a bottom with a central bore to receive threaded rod part to be nut-locked therein. The hollow con-rod side wall has a though hole. The cylinder is fitted in cylindrical recess arranged in the intake valve body and it tightly flanged to the circular ledge made on the inner side surface and the upper end of the intake valve body. Two radial holes are arranged, for example on the cylinder sidewall top part, just below the intake valve body. The hollow con-rod length, from its bottom to the circular piston lower end face, is selected equal to the difference in length of the sleeve from the cylinder radial hole axis to its lower end face, minus the circular piston height.

EFFECT: higher output coefficient.

1 dwg