Centrifugal Fan - Fan Engineering - January 2013
Centrifugal Fan - Fan Engineering - January 2013
Centrifugal Fan - Fan Engineering - January 2013
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Centrifugal fan design is usually given when the conditions are: the volume flow
rate, total pressure, the working medium and its density (or the working medium
temperature), and sometimes there are structural requirements and special
requirements.
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Design requirements of a large centrifugal fan are: to meet the required flow
and pressure conditions at the highest point of efficiency should be near;
maximum efficiency value to be as large as some of the efficiency curve flat;
pressure curve to a wide range of stability; fan of simple structure , technology
is good; convenient choice of materials and accessories; have sufficient strength,
stiffness, safe and reliable; running stable, low noise; adjusted performance,
work adaptability; fan size as small as possible, light weight; operation and
maintenance , disassemble easy transport.
However, while meeting all the requirements above, is generally not possible.
MAJ O R C ENTRIF UGAL F AN PARTS
In the aerodynamic performance and structural (strength, process) there are
contradictions between the often, usually to seize the main contradiction solve the problem. This requires designers to choose the
right design to address the principal contradiction. For example:
With the use of different fans, not the same requirement, such as public buildings used as a ventilation fan is generally used with,
the most important requirement is that the general low-noise, multi-blade centrifugal fan with this feature; and require large flow
The centrifugal fan is usually double-suction type; for some of the high-pressure centrifugal fan, low specific speed, the relative
proportion of the leakage loss is generally larger
F a n P a r ts -Im pel l er D es i g n
The centrifugal fans impeller have five basic blade shapes, and a number of impeller configurations (i.e) DWDI (Double width double
inlet) or SWSI (Single width single inlet). The impeller design will depend on the aerodynamic duty and the operating conditions.
B l a de D es i g n
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TYPES O F B L AD E D ESIGN
A highly efficient design of impeller. Its inherent strength means that in addition to handling air, it can be used with gases containing
moderate amounts of erosive particles and at high temperatures. It can carry liners and hard surfacing, if required.
B a ckwa r d i ncl i ned, fl a t pl a te bl a des
An efficient and strong shape, this design is a cost-effective alternative to the backward curved design but with flat plate blades
instead of curved. This results in a slightly lower efficiency, compensated by the easier fitting of liners.
B a ckwa r d i ncl i ned, for wa r d cur v ed bl a des
Also termed radial tipped blades, this design reduces the potential for dust build-up on the underside of the blades in applications
with moderate amounts of gas-borne dust.
A er ofoi l bl a des
3 D MO D EL O F AERO F O IL IMPEL L ER
Aerofoil bladed impellers are most commonly used in applications handling large volumes at low pressures. This highly efficient
design of fan is used in clean air or with gases containing small amounts of erosive particles.
Ra di a l bl a des
Forming a rotor which is essentially a large paddle wheel, this design results in a relatively inefficient fan with a power consumption
higher than that using the much more common backward inclined blade. Its inherent mechanical strength and resistance to wear mean
it is generally used when high quantities of abrasive dust are present in the gas stream, or when very high gas temperatures are
expected.
13 comments
may not be enough for starting the fan. Often a correct designed and adjusted motor protection system will stop the fan before the windings are
overheated and insulation damaged.
The motor torque should during design be checked against the fan wheel torque up to 90% of the synchronized speed.
10 comments
The housing is the stationary element that guides the air or gas before andafter the impeller. A housing can also be called a casing, a
stator, a scroll, a panel, a ring, or a volute. Housing, casing, and stator are all general. Scroll and volute are both restricted to
centrifugal types, whereas panel and ring are restricted to propeller types. Centrifugal housing components include the side sheets
and scroll sheets.
F AN C ASING ( VO L UTE SC RO L L )
The point of closest approach to the wheel is the cutoff, also called the tongue.The area over the cutoff is called the blast area.
Posted by Kumaran Gopal at 21:14
5 comments
Labels: centrifugal fan, CENTRIFUGAL FAN EFFICIENCY, CENTRIFUGAL FAN TERMINOLOGY- FAN PARTS, fan engineering, impeller
design, POWER CONSUMPTION
combustion engines. It is used in transporting gas or materials and in ventilation system for buildings. They are also used commonly
in central heating/cooling systems. They are also well-suited for industrial processes and air pollution control systems.
Centrifugal fans of various descriptions constitute one of several types of turbomachinery, which are used to transfer energy to a
flowing fluid. Centrifugal fans are similar in many respects to both centrifugal pumps and
centrifugal compressors. Of course, pumps handle liquids and so can easily be distinguished from fans. But, since fans and
compressors both handle gases, their differences are not very distinct. Machines with very low pressure rises are always identified
as fans, and those with very high pressure rises as compressors. For intermediate pressure rises, either description can be applied.
Even test codes and standards often fail to make a distinction. The flow through centrifugal machines is chiefly radial in the region of
energy transfer and is easily distinguished from the flow in axial-flow machines. Axial-flow fans are discussed in the next chapter,
but many of the principles of energy transfer given in this chapter are applicable to axial-flow as well as centrifugal fans.
Posted by Kumaran Gopal at 21:38
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