Performance

The Performance of the fan is symbolized by flow, total pressure, speed, power, efficiency and Parameters etc.. there are certain conversional relations between these parameters, the relation can be shown by performance curve, mathematical formula and form mode etc;

Q—Flow rate        m3/h;        H—total pressure            Pa;

N—Shaft power      kW          η—total pressure efficiency

ηm—mechanical efficiency %        r—specific gravity          kg/m3

n—speed            r/min;        t—temperature             ℃

where:

with footnote 2 symbolizes the known parameter,

with footnote 1 symbolizes the unknown parameter.

The performance of the fan normally indicates the performance under the standard state. When the operating condition is inconsistent with standard state, at this moment the Performance must be converted into the performance under the standard state. The so-called standard slate indicates: atmospheric pressure P=101325 Pa, acceleration of gravity g=9.8m/sec2, air density ρ=0.1223kg·sec2/m4, atmospheric temperature t=20℃, the required power N=10-3η-1·K·Q·H, the relative humidity &=50%

A、D、C driving efficiency value

driving mode	Mechanical efficiencyηm
A motor driving D coupling driving C belt driving	1.00 0.98 0.95

 

D—outer diameter of impeller (m)  μ—linear velocity of impeller outer circle (m/s)  ρ—air density (kg/m3)

The required power is equal to shaft power plus mechanical loss and motor storing quantity.

Installation and Operation

First, prepare attachment and tools before installation, then, check every parts of the fan, impeller, casing , shaft and bearing etc. should be inspected carefully, if damages are found, repair should be carried out, and then clean inside of the bearing box with kerosene.

The following points must be noted during installation:

1. Lubricating oil or mechanical oil should be coated on the joint surf

The motor power used by fan indicates under the specific operating condition, shaft power plus mechanical loss and storing quantity, but not the required power when the outlet full open, if the outlet or inlet of fan without connecting pipe or without outside resistance, the motor can not be put into operation. For the safety, a valve should be installed in the inlet and outlet pipes of the fan, close the valve when motor start up, the valve is slowly open after running, until reached the specific operating condition, and pay attention to the current if exceeds the rated value.

Maintenance

1. Don’t allow fan with trouble running.

2. Maintenance of fan can only be carried out during shut-down of fan.

3. Don’t freely change the maintenance person, specific person operating and repair the fan is preferred.

4. When the fan is repaired, the motor switch must be monitored or locked.

5. Regularly remove dust, contamination and the foreign materials and prevent rust.

6. Inspect the thermometer and oil indicator regularly.

7. Except replacing the lubricant after overall, replace the lubricating oil periodically.

List of troubles and causes

Troubles	causes
Severe vibration of bearing box	1.The shaft of fan is not parallel with that of motor; the coupling is misalignment. 2.friction between casing or inlet and impeller. 3.The foundation is not rigid enough or firm enough. 4.loosing of rivets in impeller or deformation of impeller. 5.Loose matching of shaft with impeller main disc. 6.Loosing of the bolts which connect casing and bearing with support, bearing with its cover. 7.Installation of fan inlet and outlet ducts is improper, which causes vibration. 8.The rotor is unbalance.
High temperature-rise of bearing	1.Severe vibration of bearing box. 2.Lubricant is poor in quality, deteriorated, mixed with dust, sand, contamination and etc. 3.Connection of bearing box cover and pedestal is over tight or Loose. 4.Fixing position between shaft and rolling bearing is slant, the front and back bearing are out of alignment. 5.wornout of rolling bearing.
Over current and high temperature-rise in motor	1.Gate or damper in the inlet and outlet pipes are not closed when starting-up. 2.Flow rate exceeds the specific value or air duct leaks. 3.Air density delivered by fan is over strong or contain visco-materials. 4.Input voltage of motor is low or is cut out in a single phase. 5.Coupling connecting is out of alignment the belt is too tight or the clearance is not uniform. 6.Influence caused by severe vibration of bearing box. 7.Influence caused by fan in parallel operation condition is worse or trouble happened.
Belt sliding	Two belts are not in the center line. The belt slides down from a small belt pulley.
Bet chattering	The distance of two belt pulleys is too short or the belt is too long.

Huashide(shandong)fan Co.Ltd

Http:www.hsdfans.com

Add:kunmingrod.linyi.P.R.china

E-mail:17853928877@163.com

 Http:www.hsdfans.com

Tel: 17853928877