Richter RMA Series - Manual (Page 10)

Series RMA
Page 10
9475-050-en Revision 12
TM 7978 Edition 08/2010
4 Product description
The housing dimensions, nominal ratings and
technical requirements of the pump series RMA
correspond to ASME B73.1, ASME B73.3, ISO 15783,
ISO 5199. The technical requirements of the VDMA
24279 are satisfied.
The sectional drawings show the design of the pump.
See Section 9.
All components which come into contact with the
medium are either plastic-lined or made of other
resistant materials, e.g. silicon carbide.
The housing 100 consists of a metallic shell with a
plastic lining.
The shaft spider 338 is pressed into the housing and
secured with the anti-torsion inserts 566/1.
The two bearing bushes 545 are pressed in from the
bearing pedestal side and secured with the anti-
torsion insert 566/2.
The distance ring 504 is inserted in-between.
The can 159 is made of CFK (high-resistance, carbon
fibre composite material). It is protected against the
corrosive medium by a can insert 158 made of
resistant plastic.
The thrust ring 510/3 is pressed in and has a positive
connection with the shaft 222 to prevent it from
turning. The shaft 222 is mounted with a positive
connection in the can insert 158.
The impeller 230 and the inner magnet assembly 859
can be separated and can therefore be replaced
independently of each other. Both components have a
positive connection for power transmission. The static tightness of the pump is guaranteed by
the screw fittings of the bracket 344 and housing
100. The bearing pedestal gasket 404 and the lips of
the can unit are jammed between both components
with the required sealing force.
Long life grease lubrication
The bearing pedestal 330 contains grease-lubricated
radial ball bearings 321/1 and 321/2. They are
sealed on both sides.
The wavy spring washer 953/1 guarantees the
necessary axial pretension of he radial ball bearings
321.
Oil bath lubrication:
The bearing pedestal 330 contains radial ball
bearings 321/1 and 321/2 which are lubricated by an
oil bath.
The wavy spring washer 953/1 puts the radial ball
bearings under axial pretension.
The oil bath is sealed against the atmosphere by two
rotary shaft seals 421/1, 421/2 and a cover gasket
403.
The torque is transmitted from the drive shaft 213
through the key 940/1 to the drive magnet assembly
858.
This is axially secured with the hex. socket screw
914/1 and the toothed lock washer 936/1. The
magnets are glued into the drive magnet assembly.
In the event of a leak in the can unit, the closed
lantern construction offers additional time-limited
protection against the medium leaking into the
atmosphere.
For this purpose, an additional gasket 404 is
provided between the bracket 344 and bearing
pedestal 330.
The flushing flow is guided on the outside past the
impeller assembly into the can. The flushing flow
returns to the housing through flushing bores in the
impeller assembly and through the plain bearings.
Further design details are provided in the enclosed
drawing. Additional information are provided in the
brochure and the product manual.