Measures prior to commissioning
Operating_Manual_Fan_KXE_04_en.docx
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There are two variants of impeller configuration:
- Impeller with shroud
- Impeller without shroud (unshrouded impeller)
Variant “impeller with shroud”:
The nozzle (rotating part) must indicate sufficient
clearance to the inlet cone (fixed part) around the
entire circumference to ensure that any possibility of
abrasion is eliminated. Never allow sparks to be
generated as a result of abrasion.
Procedure for checking the gap:
Measure the minimum gap at a minimum of eight
measuring points around the circumference (e.g. using a
taper plug gauge)
The minimum gap measured between inlet cone (2) and
nozzle (1) must be within the range 3 … 15 mm.
Permissible deviations are indicated in the order-related
drawings
Mark the position of the impeller and then turn the
impeller around 90° degrees by hand (a quarter of a full
turn)
Measure the minimum gap once again at a minimum of
eight measuring points around the circumference
Continue to turn the impeller around a quarter of a full turn
in the same direction and measure the minimum gap
Repeat the measurements and turning of the impeller until
the marking has once again reached its original position
following one complete turn
If the measured minimum gaps are less than 3 mm,
the inlet cone must be aligned to the nozzle.
Loosen the screw connections on the housing and
position the inlet cone concentrically to the nozzle.
8.2 Checking the impeller gap
Fig. 8-2 Impeller gap
1 Nozzle
2 Inlet cone
1
2
