Submersible single-entry screw pumps of EVNOP type are intended for withdrawal of stratal liquid in a complex with downhole equipment.
The pumps are related to the items of specific purpose (IKN), aspect 1 (repairable ones) GOST 27.003-90 and are designed for servicing in ,macroclimate regions with temperate and cold climate at a temperature of ambient air from plus 45 up to minus 40°С, climatic version V, location category 5 as per GOST 15150-69.
Pumps are used in view of following parameters of the pumped liquid and conditions:
The submersible single-entry screw pumps of EVNOP type are positive displacement pumps.
The pumps are divided in two parts: flow system and pump power end.
The flow system comprises: branch pipe, shell, screw and casing.
The pump power end: eccentric coupling, axial support, coupling.
The shell is a steel cylinder with vulcanized double-start (Z=2) screw profiled oil & gasoline-proof lining.
The screw is a metal rod with right-handed single-thread (Z=1) screw profile, which moves (pushes) liquid through the shell from the inlet to the outlet.
In the middle part of the casing there are holes through which the liquid comes into the pump.
The principle of operation consists in liquid travel inside the pump from the inlet to the outlet by way of periodic volumetric change of the chambers alternately communicated one with other.
The design provides for starting clutch installation (if any) to be mounted by the Client between protector (hydraulic protection) and motor, for extra pay.
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