Download Technical Manual Centrifugal Axial Fan PDF

TitleTechnical Manual Centrifugal Axial Fan
TagsBearing (Mechanical) Mechanical Fan Belt (Mechanical) Screw
File Size461.6 KB
Total Pages17
Document Text Contents
Page 1

Technical Manual on Installation, Operation, & Maintenance


Centrifugal / Axial Fan





























VENTEC AMBIENTAL EQUIPAMENTOS E INSTALAÇÕES LTDA
Rua André Adolfo Ferrari, nº 550 - Distrito Industrial Nova Era - Indaiatuba - São Paulo

CEP: 13.347.395 - C.Postal: 2086 - Fone: (19) 3801-8800 / Fax: (19) 3935-6906
e-mail: [email protected] - site: www.ventec.com.br




ISO 9001:2000

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Centrifugal / Axial Fan


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Rev.: 02 – 15/09/2008

ISO 9001:2000

CONTENTS



1 – INTRODUCTION .................................................................................................................................................. 03

2 – GENERAL CONCEPTS ....................................................................................................................................... 03

3 – DESIGN OF THE EQUIPMENT

3.1 – Arrangement 4 - Fans with rotor/helix coupled directly to motor axle end ........................................... 04
3.2 - Arrangements 3 & 12 - Fans actuated by pulleys and belts .................................................................. 04
3.3 - Arrangements 7 & 8 - Fans actuated with elastic coupling (direct rotor rotation) ................................. 05
3.4 - Arrangements 4 – Axial Fan .................................................................................................................. 05
3.5 - Arrangements 9 – Axial Fan .................................................................................................................. 06


4 – ASSEMBLY

4.1 - Transport ............................................................................................................................................... 07
4.2 – Storage ................................................................................................................................................. 07
4.3 – Foundation ............................................................................................................................................ 07
4.4 – Seating and Connections ...................................................................................................................... 08
4.5 – Inlet cones ............................................................................................................................................. 08
4.6 – Valves

4.6.1 - Rectangular Venetian blind with parallel blades ......................................................................... 09
4.6.2 - Rectangular Venetian blind with opposing blades ...................................................................... 09
4.6.3 – Radial Venetian blinds ............................................................................................................... 09

4.7 – Couplings
4.7.1 – Direct coupling ........................................................................................................................... 09
4.7.2 – Coupling by gears ...................................................................................................................... 09
4.7.3 – Coupling by mean of pulleys and belts ...................................................................................... 10

4.8 – Power Supply ........................................................................................................................................ 11
4.9 – Axial Fan – Preparation of start ............................................................................................................ 11


5 – OPERATION

5.1 - Rotor ...................................................................................................................................................... 12
5.2 – Internal part of body .............................................................................................................................. 12
5.3 – External part of body ............................................................................................................................. 12
5.4 – Valves ................................................................................................................................................... 12
5.5 – Equipment start-up ............................................................................................................................... 12
5.6 – Care ...................................................................................................................................................... 12


6 – MAINTENANCE

6.1 – General Comment ................................................................................................................................ 14
6.2 – Vibrations .............................................................................................................................................. 14
6.3 – Rotor disassembly ................................................................................................................................ 14
6.4 – Body ...................................................................................................................................................... 14
6.5 - Bearings ............................................................................................................................................... 14
6.6 – Belts ...................................................................................................................................................... 15
6.7 – Lubrication ............................................................................................................................................ 15
6.8 – Troubleshooting .................................................................................................................................... 16
6.9 – List of spare parts for 2 years of Operation .......................................................................................... 17

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ISO 9001:2000


4.4 - Seating and connections

The centrifugals fans must be installed in a position that is suitable to the foundations so that they stay in the right
position (as in drawing). The equipment must be leveled with the help of shims until it receives the anchorage bolts
in the right holes. Only after this procedure, the fixing elements should be tightened.

With the set firmly fixed to the operation position, check the following items:
- Correct leveling of rotor axle.
- Alignment of bearings, lubrication, tightening of collar and plays;
- Existence of play between rotor/cone, considering that the rotor must rotate freely (see item 3.5)
- Suitable tightening of bolts of rotor key,
- Correct fixation of transmission elements such as: pulleys / keys / bolts, etc. (see item 3.7):
- Belt alignment and tension (any corrections by the rails/stretchers) (see item 3.7.3);
- Correct fixation of motor.

Connections to pipes must for both type of fans be made only after the fan is ready to operate. Flanges that do not
fit should not be forced to prevent body distortions/deformation or misalignment to pipes.

In the event the fan is used at high temperatures, efficient sealing and suitable expansion joints should be provided
to avoid additional efforts in pipes or even in the fan.

Never submit the fan to unnecessary effort. Their bodies must never support pipes, filters, chimneys, etc..


4.5 - Inlet cones

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ISO 9001:2000

4.6 – Valves – Centrifugals Fans

4.6.1 - Rectangular Venetian blind with parallel blades
For use in inlet air boxes, usually to control flow or also used in the function of equipment insulation for starting. Its
principle is air centrifugal action at rotor inlet. Besides flow control, it also saves power considerably.

4.6.2 - Rectangular Venetian blind with opposite blades
Used for fan discharge. The key function is equipment insulation for starting. It can be used also as a flow
controller, although with less efficiency than parallel blades at inlet, particularly for large flow restrictions. It does not
provide energetic gains.

4.6.3 Radial Venetian blinds

Often used to control flow and for equipment insulation for starting. Its principle is air centrifugal action at rotor inlet.
Besides flow control, it also saves power even more than parallel blades.


4.7 Coupling

4.7.1 Direct coupling

In case of transmission in relation to speed, direct coupling via reducers is also usual.

Attention: Align axle ends carefully using a flexible coupling, whenever possible.






4.7.2 Coupling by gears

Coupling made with poorly aligned gears causes jogging, which leads to vibrations in motor transmission.

Therefore care should be taken so that the axles are perfectly aligned, strictly parallel in case of straight gears, and
in the right angle in the case of conical or helical gears.

Perfect gearing can be controlled by inserting a sheet of paper, in which appears a complete revolution copy of all
teeth.

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ISO 9001:2000

6.8 – Troubleshooting


Items Causes

Effects

Installation
1- Incorrect assembly
2 - Incorrect electric connection

A B C D E F G H
X X X X
X X X

Foundation 3- Foundation poorly made
4- Deformed concrete

X
X


X

X
X



Bases 5- Deformation X X X
Body 6- Strange body

7- Deformation


X


X
X
X






Rotor/helix

8- Unbalanced
9- Erosion or corrosion
10- Strange body suction
11- Strange body adherence
12- Inlet cone scraping
13- Deformation
14- Invert construction position

X
X
X
X
X
X

X




X

X




X


X
X


X


X






X


X
X


X
X


X


X
X


Axle

15- Warped
16- Adjustment badly done
17- Body scraping
18- Key with play

X
X
X
X

X X






X




X


X
X\
X






Bearings

19- Play above normal
20- Play below normal
21- Lubricant dirty or old
22- Inadequate lubricant
23- Excessive lubricant
24- Lack of lubricant
25- Loose bolts
26- Locking ring damaged
27- Strange body

X






X


X
X
X
X
X
X
X
X

X
X
X
X
X
X
X
X
X

X






X
X
X




Pulley
And Belts

28- Unbalanced
29- Belt too stretched
30- Loose belt
31- Wear belt
32- Strange body

X


X
X
X


X

X
X


X




X
X
X




X
X
X


X






General

33- Revolution above normal
34- Revolution below normal
35- Inverted rotation
36- Valve working badly
37- Valve damage
38- Increase load loss
39- Decrease load loss
40- Unbalanced

X X







X

X X



X
X


X


X



X
X


X



X
X
X
X
X



X
X
X
X
X


X

X







X

A- Vibration increase
B- Bearing over heated
C- Bearing damaged
D- Starting motor over loaded
E- Motor over load in operation
F- Reduce of load in operation of motor
G- Reduction on capacity and/or efficiency of fan
H- Excessive noise

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ISO 9001:2000

6.9 – List of spare part for 2 years of operation

For fans actuation direct Arrangement 4:
- 01 rotor / helix

For fans actuation indirect Arrangement 3 and 12:
- 01 rotor and axle set
- 02 bearings
- 02 bearings
- 02 bushings
- 01 Belt set

For fans actuation direct Arrangement 8:
- 01 rotor and axle set
- 02 bearings
- 02 bearings
- 02 bushings
- 01 Elastic coupling

Note: See technical data on set drawing.

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