N1V Progressing cavity pumps and electric pump units on their base are intended for pumping-out of tank oil leakages from drainage reservoirs into the main pipeline. In consultation with the Manufacturing plant it is possible to use electric pumps for pumping-out other liquids.
Electric pump units consists of the progressing cavity pump of vertical version, electric drive (electric motor or motor-reductor) and the access door for mounting on the tank hatch.
As to the principle of operation the progressing cavity pumps are positive displacement machines, in which the liquid medium is moved by way of periodic changing of the liquid chamber volume. The inlet and outlet are intercommunicated.
The progressing cavity pump is divided into flow system and pump power end. The flow system comprises: shell, screw, high-pressure branch and the casing. The pump power end consists of the bracket, drive shaft, tension shaft, eccentric coupling, end-face seal and slit gasket.
The shell consists of a liner and vulcanized profile rubber part.
The casing is a welded construction consisting of pipe and flanges served for connection with the seal body and support device. Also provision is made for the high-pressure branch.
The drive shaft is rotated in two radial and one thrust bearings, the axial gap of which is regulated by cover-tightened bushing.
The bearings are located in the bracket. Arranged on the drive shaft are the end-face seal and slit seal. The eccentric coupling connecting the drive shaft and the screw ensures planetary rotation of the screw.
The sense of screw rotation should by right hand (clockwise), if viewed from the electric drive end.
The sealing of the shaft – end-face seal with additional slit gasket.
The mounting dimensions of the discharge flange DN 50 mm correspond to GOST 12815-80 version 5. Mounting and overall dimensions of the access door of the electric pumps correspond to mounting and overall dimensions of the tank hatch DN800 (dimensions in brackets for the hatch DN700) reservoirs of EP or EPP type. By agreement with the Client the mounting dimensions of the hatch may be changed.
Electric pumps are equipped with safety and nonreturn valves arranged within one casing and fitted on the access door.
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For example N1V 14/80-9/100 UHL 1 TU 3632-154-05747979-2006, where: