2016年9月29日星期四

Ring Blower Tubing and Wiring Matters by Xianrun Blower

Ring Blower Tubing and Wiring Matters by Xianrun Blower

Ring Blower Tubing

Tubing to the air inlet and outlet, please keep the same center, do not connect them reluctantly.The tube weight should not directly on the high pressure blower. 

Xianrun Blower High Pressure Blower

Ring Blower Wiring

1. Please use the fixed voltage and frequency as the label, and assemble the correct line according to the wiring diagram;

2. The change of voltage should be within 5% of fixed voltage. 10% is OK, but it is easy to break down during the long time, so better to avoid that;

3. There is no thermal overload protection device in high pressure blower, so please install the same power over load protection switch, and adjust the same value of safety current;

Xianrun Blower High Pressure Ring Blower
4. According to the motor power and electrical works, it needs to select standard wiring;

5. Confirming the rotation direction firstly. After the wiring, turn on the switch to confirm whether the rotation direction is the same as arrow and whether there is noise. Wrong rotation direction will reverse air suction and blowing order. If the ring blower is three-phase, change any two wiring among three external wiring;

6. To prevent electric leakage, ground lead is necessary.
Xianrun Blower High Pressure Ring Blower

2016年9月28日星期三

High Pressure Blower Features by Xianrun Blower

High Pressure Blower Features by Xianrun Blower

1. The high pressure blower is dual-purpose, with suction and blowing function, so it can be exhaust fan, can also be blast blower;

2. Green environmental protection, this high pressure blower operate under low oil or without oil, the output air is clean;

High Pressure Blowers for Industrial Boilers
3. Compared with general centrifugal fan, the pressure of high pressure blower is more than ten times higher, with much higher efficiency;

4. The pump body material is fully aluminum alloy with whole die-casting, patent, fashion, simple and laconic;

High Pressure Blowers for Forging Furnace
5. Simple and convenient installation , even if there is no fixed foot pedestal, the high pressure blower can also operate, greatly saving installation cost and time;

6. During the working, the high pressure blower has very small noise;

7. Wear light, nearly free maintenance;

8. Long service life, under normal usage, it can working at least 5 years. 
High Pressure Blowers for Smelting Furnace

2016年9月27日星期二

Working Principle of High Pressure Blower by Xianrun Blower


In the designing, when the air pressure is between 30 KPA~200 KPA, this fan belongs to high pressure fan. Also called high pressure blower, it is different from general centrifugal fan. 
High Pressure Blowers for Smelting Furnace
When the impeller rotates, due to the centrifugal force, air move to outward and forward, thus forming a series of spiral movement. Air between the impeller blades spiraling rotates accelerately and pile the outside gas into side slot, after the air entering the side channel, it is compressed, then the air return to impeller blades and rotates accelerately again. 
 
High Pressure Blowers for Smelting Furnace

When the air moves along a spiral orbit and go through the impeller and the side channel, every impeller blade increases the degree of compression and acceleration. With the rotation, the kinetic energy of the gas increasing, the air pressure along the side of the channel increase further. When the air reach to the connection between side channel discharge and flange, the air is squeeze out of the blades and exhausted out of pump through the muffler.
XIANRUN BLOWER HIGH PRESSURE BLOWER

2016年9月26日星期一

The Features of Non Power Roof Ventilation Fan by Xianrun Blower

Non Power Roof Ventilation Fan Features by Xianrun Blower 

1. The curved blades have the best condition after scientific calculation, it can prevent rain and water intrusion during the working. The air exhausting efficiency is high, and the ventilation fan will operate lightly as long as the indoor and outdoor temperature difference is more than 0.5 Celsius degree.

Non Power Roof Ventilation Fan
2. Center shaft have detailed steps, which guarantee the fan blade will never be out of shape under high speed operation, and improve the ventilation fan service life. 

3. Changed diameter pipeline can make the ventilation fan easy to install in the slanting roof. The installation is very simple, ordinary people can finish the installation within 30 minutes. 
Non Power Roof Ventilation Fan
4. Saving money, reduce supporting cost, save electricity cost, and mounting cost, reduce noise.

5. Long service life, this model non power roof ventilation fan can work at least 10 years.

6. Free lubrication and maintenance.  

7. The material is stainless steel, and corrosion resistance. 

Non Power Roof Ventilation Fan

2016年9月25日星期日

Non Power Roof Ventilation Fan By Xianrun Blower

Non Power Roof Ventilation Fan By Xianrun Blower 

Introduction 

Non power roof ventilation fan, which is rotated by natural wind, change the parallel air flow direction; speed up and change the airflow from up to bottom vertically; so as to improve the effect of indoor ventilation and air exchanges.

Large Airflow Axial Fan for Ventilation

This ventilation fan does not use electricity, no noise, long-term operation, and eliminate indoor hot gas, moisture and noxious gas. According to air nature laws and principle of air flow rule, the non power roof ventilation fan installed on the roof reasonably, 
exhaust indoor heat air and dirty gas, so as to improve the indoor environment.

Large Airflow Axial Fan for Ventilation

Working Principle 

Turbine ventilation fan uses heat convection caused by the temperature difference between indoor and outdoor. The heat convection drives turbine fan rotation this turbine rotate, so as to exhaust dirty air to outdoor by making use of centrifugal force and negative pressure effect.

2016年9月23日星期五

Square Negative Pressure Fan Structure by Xianrun Blower

Square Negative Pressure Fan Structure By Xianrun Blower

1. Fan chassis: Frame and shutter are manufactured by galvanized plate material mold;

2. Fan blades: One-time stamping molding blades, fastening by screw, the computer precision balance calibration;
Large Airflow Axial Fan for Ventilation

3. Shutter: Shutter adapting pieces are made by high strength plastic steel, closed tightly, long service life, with the features of dust proof and water proof under the non-use state;

4. Motor: IP 44 or IP 54 high quality copper wire motor, generally it has two kinds, 380 V and 220 V;

5. Belt: Common rubber v-belts;

Large Airflow Axial Fan for Ventilation
6. Air guide sleeve: Guiding the air to air outlet, then discharged outside intensively;

7. Protection guard: Security guard to prevent manpower or foreign body into the fan;

8. Belt pulley: Transforming the motor speed into low speed by the sizes of the belt, reducing the noise of the fan operation and motor load.
Large Airflow Axial Fan for Ventilation

2016年9月22日星期四

Application Places Of Square Negative Pressure Fan

Square Negative Pressure Fan Application Places by Xianrun Blower

1. High temperature or smelly workshop, such as heat treatment plant, casting factory, plastics factory, aluminum plant, shoe factory, leather factory, electroplate factory, and all kinds of chemical plant.

Large Airflow Axial Fan for Ventilation
2. Labor-intensive enterprises, such as garment factories, all kinds of assemblies workshop, Internet bar.

3. Gardening, greenhouses, chicken farm, pig farm, cattle farm, and all types livestock farms ventilation and cooling.
Large Airflow Axial Fan for Ventilation
4. The Places need cooling and certain humidity. Such as cotton mill, woolen mill, flax textile factory, weaving mill, chemical fiber factory, warp knitting factory, texturing factory, knitting mill, silk factory, socks factory and other kinds of textile mills.

5. Warehousing logistics fields, all kinds warehouse, and logistics park. 

Large Airflow Axial Fan for Ventilation

2016年9月21日星期三

Introduction and of Working Principle Square Negative Pressure Fan by Xianrun Blower

Square Negative Pressure Fan Introduction and Working Principle by Xianrun Blower


Square negative pressure fan is a new kind of axial flow fan. Shell material of square negative pressure fan generally are galvanized plate or stainless steel, the purpose is to enhance the corrosion resistance and strength of square negative pressure fan.

Because the fan shell shape is square, so called square negative pressure fan,this types fan has the features of nice appearance, large air volume, low energy consumption, low speed, low noise, dust proof, rain proof, etc.

Large Airflow Axial Fan for Ventilation

Working Principle of Square Negative Pressure Fan

Working principle is to use negative pressure ventilation, and reach the purpose of air circulation and ventilation cooling. 

When the square negative pressure fan starts to work, it exhaust dirty air, hot air, muggy air from indoor to outside by large blades rotation, at the same time, there will be differential pressure between the indoor and outdoor air, then the indoor air become thin, forming a negative pressure zone, finally, the outdoor fresh air will flow into the indoor naturally due to the pressure difference compensation.

Large Airflow Axial Fan for Ventilation


2016年9月20日星期二

Operation Steps of Centrifugal Fan Normal Shut Down after Working by Xianrun Blower

Operation Steps of Centrifugal Fan Normal Shut Down after Working by Xianrun Blower:



A. Open the vent valve (or bypass valve at outlet) gradually, at the same time close the exhaust valve gradually. 

B. Close adjusting door step by step to 20 ~ 25 angle. 
High Temperature Fans for Dust Collecting
C. Press the stop button, and notice whether there are any abnormal phenomenon in the process. 

D. After the centrifugal fan unit stop 5 ~ 10 min, or bearing temperature has dropped below 45 Celsius degree, stop oil supplying. 
For the unit with floating seal ring, the sealing oil pump must continue to oil, until the centrifugal fan temperature drops below 80 Celsius degree. 

Stainless Steel Material Anti-corrosion Fans
E. After the unit stopping, it need to turn the dynamic rotor 180 angle within 2 ~ 4 hours. 

2016年9月19日星期一

The Reasons Analysis of Centrifugal Fan Required Emergency Stop


Centrifugal fan requires emergency stop in the following situations. The operation of the emergency stop is to push the main motor stop button, and then handle the problem of after stop. 
New Design Centrifugal Fan for Boilers

A. Centrifugal fans break out sudden strong vibration, and vibration amplitude is more than tripping values. 

B. The centrifugal fan body internal parts have touch scraping or abnormal friction sound. 

C. Bearing or sealing parts have smoke, or the bearing temperature rise sharply to the alarm value. 

D. Oil pressure is lower than the alarm value and can not return to normal value. 


High Pressure ID Fan by Xianrun Blower

E. The liquid level of oil tank is low, and empty absorption phenomenon has appeared. 

F. Axis displacement values appear obvious sustained growth, and achieve alarm value.


2016年9月18日星期日

How to Reduce the Noise of Industrial Fans and Blowers by Xianrun Blower? Part 2

(6) Installing silencers in industrial centrifugal fan air inlet and air outlet is also a good way to reduce noise, absorbing the sound energy by porous sound absorption material.
When sound waves go through the air inlet and outlet of porous sound absorption material, most sound energy is consumed away and becoming heat by overcoming frictional resistance and viscous drag resistance, so as to reduce the aerodynamic noise produced by centrifugal blower. 
Practice shows that, installing the silencers in air inlet or air outlet of centrifugal fan can usually reduce aerodynamic noise about 20 ~ 30 db (A).
Xianrun Blower centrifugal fan with silencer

(7) The size of the industrial centrifugal fan impeller outlet is generally larger than impeller inlet of front disc, so the air flow in the fan will causing many eddy flow at inlet arc section. Eddy flow will generate aerodynamic noise by frequently collision with casing and air inlet parts. In this case, designing the rectifying ring and baffle outside of air outlet, can effectively prevent the eddy flow in the centrifugal fan air inlet, thus reducing the aerodynamic noise generated by centrifugal fan.

(8) Applying backward swept blades in industrial centrifugal fan, that is to say, the impeller blades lean forward in impeller air outlet, while the impeller blades lean backward in impeller air inlet, avoiding gas flow channel changing rapidly. 
All these can reduce the aerodynamic noise by preventing eddy flow.

Xianrun Centrifugal Blower Impeller

(9) Using wall plates or components as grading shield or protection cover, the noise will be blocked during the spreading. This will control the noise within a certain scale, and reduce centrifugal fan noise. 
Xianrun Blower centrifugal fan production cover

2016年9月17日星期六

How to Reduce the Noise of Industrial Fans and Blowers by Xianrun Blower?


(1) Centrifugal fan impeller, fan shaft, pulley and coupling, these rotating parts must be processed with the dynamic balance and static balance correction, and assemble after qualification.  At the same time, the interval between motor cooling fan blade and fan shroud should be reasonable, so as to reduce the the motor cooling fan blade rotation noise.

(2) Check the centrifugal fan connecting bolts and anchor bolts looseness regularly, and abnormal wear or bad lubrication bearing, whether the belt is tension, etc. For any abnormal situation, should stop the centrifugal fan immediately and check carefully.
Xianrun Blower High Pressure Centrifugal Fan

(3) During the installation, between the centrifugal fan and the reinforced concrete foundation should have soft materials, such as cushion rubber, cork board or felt board and so on, in order to reducing or eliminating vibration of centrifugal fan passing to reinforced concrete foundation for maximum limit.

(4) It is better to install flexible connection in the industrial centrifugal fan air inlet and air outlet, so as to reducing or eliminating vibration of centrifugal fan passing to air duct in rubber hose for maximum limit.

centrifugal fan flexible connection by xianrun blower
(5) Choose a reasonable motor cooling fan blade shape,parameters, and etc., and reduce the vortex noise of motor cooling fan effectively.

2016年9月13日星期二

Notes To Centrifugal Blower Selection by Xianrun Blower

As we all know, it needs to get much knowledge before choosing a suitable blower. And the selection methods are different according to different selection standard. 

1.According to physical, chemical properties of different gases, it needs to select different fans. Such as, the explosion-proof fan for conveying explosive and flammable gas; 
coal dust fan is used to convey coal dust; corrosion resistant fan for corrosive gas; heat resistant fans are applied in high temperature gas or high temperature situation.


xianrun blower high pressure centrifugal blower

2. Understanding the centrifugal blower production and quality are necessary before selecting the industrial fans and blowers. Such as the centrifugal fan varieties, specifications and development and promotion of new products, and the requirements of environmental protection.

3. If there are two models centrifugal blower are available in the performance table, it is better to give preference to higher efficiency, smaller size, larger adjusting range.

4. If the ventilation system have requirement for noise, it is better to select high efficiency, low impeller rotational speed fans. And according to the noise and vibration modes of transmission, adopt corresponding noise elimination and vibration reduction measures. Vibration reduction measures of fan and motor includes spring shock absorber or rubber shock absorber, etc.


Xianrun Blower high capacity centrifugal blower

5. If the selected fan impeller diameter fan is larger than the original impeller. In order to advantage of the original motor shaft, bearing and supporting, it is necessary to check
the starting time, strength of the original parts and the shaft critical speed.

6. Try to avoid using the centrifugal fan working in parallel or in series. When the inevitable, it needs to select the same model centrifugal fan, with the same performance. 
When using series operation, there should be certain pipeline connection between the first level fan and second level fan.

7. The new selected fan should make full use of existing equipment, and be suitable for on-site installation and in safe operation.
xianrun blower high pressure centrifugal blower


2016年9月12日星期一

How to select the suitable centrifugal fan? The 3rd Stage of Selection by Xianrun Blower


The 3rd Stage of Selection of Centrifugal Fan Selection by Xianrun Blower

According to the known air density, speed, model, and the rough estimate of the fan number, using the drawing function of software, express dimensioned performance curve of the fan, demarcate the fan operating point at the same time, and list dimensioned performance table, demarcate operating point location. 


Xianrun Blower Coupling Driving Centrifugal Fan 

Further more, according to actual working condition performance,finally, determine the fan internal power.

Through the above three stages, and centrifugal fan selection is basically ended. In general, through these blower selection steps, you can choose the most appropriate centrifugal fan.


Xianrun Blower Belt Driving Centrifugal Blower

2016年9月11日星期日

How to select the suitable centrifugal fan? The 2nd Stage by Xianrun Blower

Centrifugal Blower Selection Process by Xianrun Blower

The 2nd Stage of Selection:


The centrifugal fan model determines the performance curve, performance curve can be divided into dimensioned curve and dimensionless curve. 


xianrun blower industrial centrifugal blower

Dimensioned curve is the basis to decide whether the centrifugal fan can meet the site requirements, while the dimensionless curve is the basis of depicting the fan performance. The dimensioned curve represents the particularity, dimensionless curve represents the universality.

In general, the dimensionless parameters are the airflow coefficient, pressure coefficient, the efficiency, specific speed. 


xianrun blower ID Fan

Airflow coefficient, pressure coefficient are the basis for calculating fan model; specific speed is the basis to select the fan model; the efficiency is to determine whether the centrifugal fan have high efficiency.

According to the specific speed, to select the fan model and determine whether the working points are in high efficient area. If the points are in high efficient area, it needs to preliminary calculation fan model according to airflow coefficient and pressure coefficient.


2016年9月9日星期五

How to select the suitable centrifugal fan? by Xianrun Blower


Centrifugal fan selection is an important part, because it is related to  whether the centrifugal blower can play the highest efficiency.


xianrun blower direct drive centrifugal blower


The 1st Stage of Selection:

The first thing is to confirm the air flow, air pressure, density of gas, which are the three basic elements in centrifugal fan selection process. 

1. Density is the primary elements in the selection process, if the density is unknown, it needs to calculate or convert the density according to the working environment, such as altitude, the local atmospheric pressure, operating temperature, and so on.

2. Air pressure is the second element in the centrifugal fan selection, according to a given or calculated the density of working condition, then convert the working pressure to the fan pressure of standard condition. If the fan is equipped with inlet box or silencer, 
it needs to consider the pressure loss, estimated losses are generally between 100-300 pa after the estimation.

3. Air flow is the third element in selection process. If the system require the gas mass flow rate, you need to convert the gas mass flow to volume flow rate in standard condition.
xianrun blower coupling drive centrifugal blower

The next step is to circulate centrifugal fan specific speed, which is an important step in the centrifugal fan selection process, as well as the main basis to choose centrifugal blower specific model.

  Air volume/air flow

m3/h
 Total pressure or static pressure

Pa
  Medium temperature

 °c
  Voltage

V
  Frequency

Hz
  Altitude of operation place

m

2016年9月8日星期四

Centrifugal Blower Selection Principle by Xianrun Blower

How to select a suitable blower to you?  By Xianrun Blower

1. Selecting high efficiency, small size, large adjusting range centrifugal fans, meet acceptable performance, efficiency and quality requirements;

2. The centrifugal blower working point need to be near efficiency running point, to ensure the stable operation, avoid the fan works in surge area;
Xianrun Blower centrifugal fan performance curve

3. Reducing noise by decreasing the centrifugal fan speed and selecting bigger size blower;

4. If selecting oversize blower, the blower will works in small air volume area, pressure difference is big between air inlet and outlet, causing operation instability and high impulsive noise;

5. If selecting undersize blower, the fan will increase rotation speed, the air will have higher speed after leaving the blades, also causing higher noise;


Xianrun Blower warehouse

6. In general, the average wind speed in fan air outlet is at 10 ~ 15 m/s, can not be more than 17 m/s;

7. The fan speed is less than 450 RPM, selecting 8 poles motor; 451 ~ 799 RPM, selecting 6 poles motor; 800 ~ 1500 RPM, selecting 4 poles motors; more than 1500 RPM, selecting 2 poles motors.
Xianrun blower centrifugal fan delivery