| 摘要 |
FIELD: engines and pumps.SUBSTANCE: invention relates to oil production by means of bottom-hole oil pumps. The hydraulic system driving the oil bottom-hole pump comprises the bidirectional variable displacement piston pump, the outlet speed detection section, the outlet pressure detection section and the proportional solenoid operating valve. They are implemented in the form of integrated structure of the block in the same shell with the pump housing. The pump housing includes a connection section which is implemented on a side surface of a covering and which joins the outlet channel of the pump of the external pilot hydraulic contour and the second pilot channel which supplies external pilot pressure from the connection section to the pilot channel between the outlet channel of the piston pump and the proportional solenoid operating valve. Also it contains a device which mechanically shuts supply of external pilot pressure when outlet pressure of the piston pump is below the pre-set pressure. As a result, the hydraulic system driving the oil bottom-hole pump is capable to exclude cavitation, even when the control system stops.EFFECT: providing the simple design which does not depend from electric controls and causes no cost increase.3 cl, 8 dwg |
