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04/18/23 1
InnovationInnovation
A completely new concept of a magnetic-drive pump
04/18/23 2
Subdivision of the presentationSubdivision of the presentation
1.) Weakness of the magnetic-drive pumps in classical design in cases of intermittent flow (quasi-dry running)
2.) New concept to locate the radial slide bearings*
3.) New concept of a close coupled pump*
4.) New concept to absorb the axial thrust by the magnetic coupling itself*
5.) Photo of the magnetic-drive pump type MONSUN * applied for patents
04/18/23 3
Intermittent flow and its Intermittent flow and its consequencesconsequences
The intermittent flow is one of the most frequent and gravest cause for breakdowns of centrifugal pumps.
Losses at the rate of some millions of € are resulting from those failures, to the pleasure of the after-sales service departments of the pump manufacturers.
Especially the magnetic-drive pumps often are not worth a repair (economical total loss).
To achieve a competitive advantage many pump manufacturers are trying to find technologies to prevent those kinds of damages.
04/18/23 4
Reasons for intermittent flow Reasons for intermittent flow
Emptying of the suction tank (as shown) Low plant resistance (pump operates far right on its curve) Closed suction valve Dirty filters or plugging in front of the pump High gas content (e.g. caused by swirls)
04/18/23 5
The problem zone of classic The problem zone of classic magnetic coupled pumpsmagnetic coupled pumps
Slide bearings radial far inside
Low circumferentia
l speed
No real
sliding, but
mixed friction
Need for high
grade,
wear resistant
materials
04/18/23 6
Intermittent flow: What happens Intermittent flow: What happens inside the pump?inside the pump?
The liquids tear-of is displayed in the Q-H-diagram as quick reduction of the volume
flow along the plant resistance curve !
04/18/23 7
Intermittent flow: What happens Intermittent flow: What happens inside the pump?inside the pump?
04/18/23 8
Intermittent flow: What happens Intermittent flow: What happens inside the pump?inside the pump?
04/18/23 9
Intermittent flow: What happens Intermittent flow: What happens inside the pump?inside the pump?
04/18/23 10
Intermittent flow: What happens Intermittent flow: What happens inside the pump?inside the pump?
04/18/23 11
The bearings lie fully dry, though a rest of liquid is circulating in the pump:
Quasi dry runRemaining radial forces act upon the
bearings, which are not lubricated anymore:Hot run
Intermittent flow: What happens Intermittent flow: What happens inside the pump?inside the pump?
04/18/23 12
Other state-of-the-art designs (1)Other state-of-the-art designs (1)
Bearings still fully in the
“problem zone”
04/18/23 13
Bearings still fully in the
“problem zone” as well
Other state-of-the-art designs (2)Other state-of-the-art designs (2)
04/18/23 14
The shaft less pump as right wayThe shaft less pump as right way
CORRECT: Slide bearings
to the outside!!!„Shaft less concept“
DISADVANTAGEOUS: Thin isolation shell is used as
bearing (Emergency and start-up bearings
still required)
DISADVANTAGEOUS: Bearings
difficult to reach
SUBOPTIMAL: Why not even farer to the outside??
WHY NOT THERE ?
04/18/23 15
Shaft less concept MONSUNShaft less concept MONSUN
Sliding bearings radial outside to the maximum
possible
Magnetic driver positioned at
the inside
Simple bearing geometries
possible due to real sliding
Impeller and drum bearings form one single
unit
04/18/23 16
Direct access to the bearingsDirect access to the bearings
Option: temperature control
Option: flushing - very simple
04/18/23 17
Liquid tear-ofLiquid tear-of
Bearings are located in the wetted area
04/18/23 18
Very low static head
Bearings lie dry
Liquid tear-of – worst caseLiquid tear-of – worst case
04/18/23 19
The solution : A lubrication The solution : A lubrication reservoirreservoir
Rotating lubrication reservoir
Circular partition wall prevents empting of
the lubrication reservoir
04/18/23 20
Cooling stream from electrical motor
Cooling rips at the casing guide the
friction heat away
Cooling of the lubrication reservoirCooling of the lubrication reservoir
04/18/23 21
Conventional Conventional closed coupled designclosed coupled design
Advantage: Short axial dimension
Disadvantage: The assembly of the magnetic driver requires the final assembly of the electrical motor.
04/18/23 22
Ball bearings located inside the isolation
shells opening: large bearing distance.
Pump is premountable and not depending on
variants. Good for stockholding!
MONSUNMONSUNball bearing conceptball bearing concept
04/18/23 23
Universal shaft endUniversal shaft end
Alternatively: Journal part of a coupling…
… or shaft end of a standard pump
Flywheel mass
04/18/23 24
MONSUN 50-200MONSUN 50-200
New magnetic coupling acts
additionally as magnetic thrust
bearing
Dynamic throttling gab regulates axial position of the rotor as well
04/18/23 25
MONSUN 50-200MONSUN 50-200
Temperature sensor (Option)
1500 1/min:Δt10min´= 2,5 °C
3000 1/min:Δt10min = 10 °C
Temperature rise of emergency reservoirrelated to speed: (ca. values for water)
04/18/23 26
Classic magnetic couplingClassic magnetic coupling
Same polarity in axial direction
04/18/23 27
Axial reset capability of the classic Axial reset capability of the classic magnetic couplingmagnetic coupling
Number of green triangles
is important
100 N
100 N
04/18/23 28
400 N
100 N
Alternating polarity in axial
direction
Axial reset capability of the Axial reset capability of the MONSUN type magnetic couplingMONSUN type magnetic coupling
04/18/23 29
MONSUN type magnetic couplingMONSUN type magnetic coupling
Low losses of transferable nominal torque (circa 80% of classic coupling). Increasing the axial reset forces by a multiple.
04/18/23 30
MONSUN as MONSUN as standard pump (ISO 2858)standard pump (ISO 2858)
MONSUN 32-200
04/18/23 31
MONSUN in closed coupled designMONSUN in closed coupled design
MONSUN 32-200 F
04/18/23 32
End of the presentationEnd of the presentation