INOXPA HLR, Installation, Service And Maintenance Instructions

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6 3.General Information (A) 2021/11
3. General Information
3.1. DESCRIPTION
The HLR rotary lobe pumps by INOXPA are part of our wide range of positive displacement rotary lobe pumps for viscous
liquids.
The following models exist in the hygienic rotary lobe pump range:
• The HLR pump normal flow rate suitable for differential pressure of up to 12 bar.
• The HLR with wider lobes, delivers a higher flow rate, and is suitable for differential pressure of up to 7 bar.
The HLR model has been specially developed to respond to all hygienic requirements in the Bio-Pharm and Food industries.
As regards hygiene, reliability and sturdiness, the complete range of rotary lobe pumps satisfies all requirements set by the
aforesaid industries.
Its modular design enables optimal part interchange between the different pumps.
The rotary lobe pumps are positive displacement pumps. Owing to the contact between the internal parts, the pressure
variations, etc. they make a louder noise than centrifugal pumps. This noise must be taken into consideration when installing
these pumps.
The HLR rotary lobe pumps by INOXPA have been certified by EHEDG and designed so that they meet the requirements of 3A
Sanitary Authority.
This equipment is suitable for use in food processing applications with strict hygienic requirements.
3.2. OPERATING PRINCIPLE
The rotary lobe pump is a positive displacement rotary pump. The left lobe (except in the case of pump size 0) is driven by the
driving shaft. The right lobe (except in the case of pump size 0) is located on the driven shaft, and is driven via a helical gear.
Both lobes rotate in synchronism without one touching the other. When the pump is running they displace a set volume of
liquid. Figure below shows how a rotary lobe pump operates.
A : When the lobes rotate, the space on the suction side increases because one lobe moves away from the other, thus causing
a partial vacuum that draws the liquid into the pumping chamber.
B : Each lobe void is filled consecutively as the shafts rotate and the liquid is displaced towards the discharge side. The small
clearances between the lobes, and between the lobes and the walls of the rotor case, duly cause the spaces to be rather well
closed.
C : The rotor case is completely full and the liquid leaks through the meshing of the lobes, knocking against the space walls so
as to thus complete the pumping action.
3.3. APPLICATION
The main advantage of the INOXPA HLR rotary lobe pump is its capacity to pump a great variety of viscous liquids, from 1
mPa.s up to 100.000 mPa.s
Furthermore, it is capable of pumping liquid products that require very careful handling and liquids that contain soft solids thus
causing only a minimum degradation of same.