| 摘要 |
A well pump unit has a body with upper and lower crossover shoes, there hydro-motor is placed, this comprises a piston installed in cylinder with formation of over-piston and under-piston cavities, inlet and outlet valves installed in the centrator in the upper part of the cylinder over the piston. The pump comprises a cylinder separated to the over-piston and the under-piston cavities by piston connected to the piston of the hydro-motor by rod going through gasket partition placed between the hydro-motor and the pump. The suction and the pump-in valves of the pump are connected by channels with the under-piston cavity of the pump cylinder. In the upper crossover shoe chamber is provided where unloading piston is installed, this is rigidly connected to the inlet valve, the cavities over and under unloading piston are connected to the outlet and the inlet windows. The over-piston cavity of the cylinder of the hydro-engine is connected to the outlet window by the channel in the inlet valve and unloading piston, at that the channel is arranged with possibility of closing by outlet valve. The under-piston cavity of the cylinder of the hydro-motor is connected to the inlet window by channel arranged with possibility of periodical closure by unloading piston, and the valve installed in the channel between the under-piston cavity of the cylinder of the hydro-motor and the outlet window is arranged with possibility of opening at contact with the unloading piston. Such implementation of the unit makes it possible to achieve higher lift and supply of liquid.
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