Dynamic Balancing of Fan Impellers and Blowers

Dunamis Technical Services, DUTEC offers Dynamic balancing of Fan Blowers and Impellers onsite. 

Introduction to Balancing of Fan Impellers

The term ‘’Balance’’ can be defined as an ideal condition of a Fan that has neither static nor dynamic ‘’Unbalance’’. Such a fan does not impart any vibratory force or motion to its Bearings as a result of centrifugal forces. 

Balancing

Balancing is a procedure by which the mass distribution of a fan is checked and, if necessary, adjusted.  This procedure ensures that the vibration of the Journals and/or forces on the Bearings at a frequency corresponding to operating speed are within specified limits

Types of Balancing for Fan Blowers and Impellers - Procedure

Two-plane Dynamic Balancing Services:  This is a procedure which ensures mass distribution into two planes. The adjustments are made by adding or removing mass in those planes in order to reduce the primary force and secondary force couple caused by the initial Unbalance.

Single Plane Static Balancing Services:  This procedure ensures mass distribution of a Rigid Rotor or fan is resolved into one plane. Similarly, its adjustments are made by adding or removing mass in that plane only in order to reduce the initial Unbalance force.

Who can perform Dynamic Balancing of Fan Impeller?

At DUTEC, we have our engineers and technicians remotely situated in Lagos State & Rivers State, Nigeria. They are ready to travel to your facilities to carry out our dynamic balancing services.

Who can perform Dynamic Balancing of Fan Impeller?

DUTEC is a trusted provider of dynamic balancing services. We are the perfect partner to help balance your machine rotating parts. We offer our services nationwide (carry out dynamic balancing in your facility). There’s no reason why you would look elsewhere to have your parts balanced.

Methods of Blower Fan Balancing

Non-Rotating: The simplest method of Static Balancing consists of a fan mounted with its axis horizontal and allowed to pivot about its Shaft Axis. Any deviation of the center of mass relative to the Shaft Axis will cause it to pivot. Weight can then be added to or subtracted from the fan until there is no pivoting. The latest technology for non-rotating Static Balancing utilizes a vertical arbor or axis. This uses the force of gravity to provide electronic signals to indicate the amount of correction required and its location.

Rotating: Dynamic Balancing is normally accomplished with an electronic Balancing Machine. This machine usually have a rotating horizontal arbor, with either hard or soft Bearings (refer to Section 5.2.2). It is capable of measuring the amount and location of Unbalance in each of two axially separated planes.

Two-plane rotating Balance is the preferred method for balancing wheels when the width to diameter ratio is greater than 0.30.

The narrow width of propeller fans and narrow blower wheels make plane separation impractical, and corrections are only made in one plane.

When a blower wheel is balanced dynamically, corrections are made in each of two correctional planes. This compensates for the “couple” effect caused when the Unbalance locations for each plane are out of phase with each other.

Correcting for Unbalance in Blower Fans

Correcting unbalance is accomplished by adding or removing an appropriate amount of weight from one or more locations on an Impeller.

Unbalance Limit for Blower Fans

When a blower wheel or propeller is balanced separately as a component, Balancing is done and the unbalance limit is expressed in mass displacement units.

Unbalance limits determines the acceptable vibration levels for most applications because of a wide range of variables involved in applying a component to a system, including a poorly designed system. The vibrational effect of the residual Unbalance cannot be predicted unless all the system variables are considered

REFERENCES

  • AMCA Standard 204-05, Balance Quality and Vibration Levels for Fans, 2005. Air Movement and Control Association International, Inc., 30 West University Drive, Arlington Heights, IL 60004, U.S.A.
  • American National Standard, ANSI Standard S2.7-1982 (R2004), Balancing Terminology, 2004. American National Standards Institute, 25 West 43rd Street, 4th Floor, New York, NY 10036, U.S.A.
  • American National Standard, ANSI Standard S2.19-1999 (R2004). Mechanical Vibration – Balance Quality Requirements of Rigid Rotors – Part 1, Determination of Possible Unbalance, Including Marine Applications, 2004. American National Standards Institute, 25 West 43rd Street, 4th Floor, New York, NY 10036, U.S.A.
  • ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration, Second Edition, 1991. American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. 1791 Tullie Circle N.E., Atlanta,GA 30329, U.S.A.
  • ISO Standard 2953-1999, Mechanical Vibration – Balancing Machines Description and Evaluation, 1999. International Organization for Standardization, Case Postale 56, 1, rue de Varembe, CH-1211, Geneva 20, Switzerland.

Additionally, If you need more information on fan impeller balance, you may be interested in below blogs;

  1. How Dynamic Balancing Resolves Unbalance Fault in Rotating Parts
  2. Onsite Dynamic Balancing Services
  3. How To Balance A Fan Impeller And Blower
  4. Dynamic Balancing Services of Fan Impellers And Blowers

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