1、 Overview:

The main characteristics of the 6-27 centrifugal fan are high pressure and low flow rate. A filter is installed at the fan inlet, which can be used for high purification forced ventilation. This fan has the characteristics of good aerodynamic performance, compact structure, reliable operation, easy installation and maintenance, long service life, high efficiency, and low noise. This product is widely used in industries such as metallurgy, machinery, textiles, chemicals, building materials, and hydropower for forced ventilation and in places that require high-voltage power sources. The medium being transported is air and gases containing trace amounts of acidity that are harmless to the human body. There must be no viscous substances in the gas, and the content of dust and hard particles should not exceed 150mg/m3. The high temperature of the gas should not exceed 80oC.

2、 Type and structure:

The wind mechanism is single suction, with two types of rotation: clockwise and counterclockwise. When viewed from one end of the motor and the impeller rotates clockwise, it is called a clockwise rotating fan, represented by "clockwise"; The counterclockwise rotation of the impeller is called a counterclockwise rotating fan, represented by "counterclockwise".

The outlet position of the fan is represented by the angle of the air outlet of the casing. The adjustment range is between 0 ° and 180 °, and both "forward" and "reverse" can be made into three angles: 0 °, 90 °, and 180 °.

The transmission mode of the fan is direct motor drive (A-type drive).

The fan is mainly composed of a filter, an air inlet group, a front cover plate group, an impeller group, a casing group, a bracket group, an electric motor, etc.

3、 Parameter table:

The parameters provided in the performance table, unless otherwise specified, are calculated based on the standard inlet state of the fan, which is the standard state of air medium, pressure of 101325Pa, temperature of 20 ℃, density of 1.2kg/m3, and relative humidity of 50%.

4、 Installation and Debugging

1

Before installation, a comprehensive inspection of all components of the fan should be carried out to ensure that the parts are complete, the connections between each part are tight, the rotation direction of the impeller and the casing is consistent, the main parts are not damaged, and the transmission is flexible. If any problems are found, they should be repaired and adjusted immediately.

2

During installation, pay attention to checking that there are no tools or debris that have fallen or been left inside the casing and other enclosures. On some joint surfaces, in order to prevent rust and reduce disassembly difficulties, some lubricating grease or mechanical oil should be applied. The joint surface between the fan bracket base and the foundation, as well as the connection of the inlet and outlet pipes, should be adjusted to fit naturally. Forced connection is not allowed, and the weight of the pipes should not be added to the various components of the fan. Attention should be paid to ensuring the horizontal position of the fan.

3. Installation requirements

① Install according to the position and size shown in the diagram. To ensure high efficiency, it is particularly important to ensure the axial and radial clearance dimensions between the air inlet and the impeller.

② After installing the fan, try pulling the impeller by hand or lever to check for any tightness or collision with the fixed parts. If any tightness or collision is found, it must be adjusted properly.

4. Trial operation of the fan

After all installations are completed and the overall inspection is qualified, the fan can be put into trial operation. In order to prevent the motor from burning out due to overload, it is necessary to start and test run the fan with no load (close the inlet valve and slightly open the outlet valve). If the situation is good, then gradually open the valve until the specified operating conditions are met. Conduct a continuous operation test, with a trial run time of no less than 2 hours for newly installed fans and no less than half an hour for repair and installation. If no abnormal phenomena occur, the fan can be officially used.

The power selected for the ventilation fan refers to the specific operating conditions, such as mechanical losses and the required reserve capacity. Strictly control the current during operation and do not exceed the rated value of the motor, otherwise it may burn out the motor.

5、 Maintenance and upkeep of fans

In order to avoid human malfunctions caused by improper maintenance, prevent natural failures of fans and motors, ensure the normal operation of fans, fully utilize equipment efficiency, and extend the service life of fans, it is necessary to strengthen the maintenance of fans.

1. Precautions for maintenance work:

(1) Only operate when the fan equipment is completely normal.

(2) If the fan equipment is started after maintenance, attention should be paid to whether all parts of the fan are normal.

(3) Regularly inspect the dust, dirt, and other impurities inside the fan and gas delivery pipeline, and prevent rusting.

(4) To ensure personal safety, maintenance of the fan must be carried out while parked.

2. Precautions for normal operation of the fan:

(1) If any abnormal phenomenon is found during the driving, parking or operation of the fan, it should be checked immediately.

(2) For minor faults discovered during inspection, the cause should be promptly identified and efforts should be made to eliminate or handle them. If minor faults cannot be eliminated or major faults are discovered, the vehicle should be stopped immediately for maintenance.

6、 Main faults and causes of the fan

1. Severe vibration of the fan:

(1) Friction between the casing or air inlet and the impeller;

(2) The stiffness of the bracket is insufficient or not firm enough;

(3) Loose rivets on the impeller or deformation of the impeller;

(4) Loose fit between impeller shaft disc hole and shaft;

(5) Loose bolts connecting the casing and bracket;

(6) Poor installation of fan inlet and outlet pipelines, resulting in resonance;

(7) Impeller deformation, blade wear, dust and dirt accumulation on the blades, and shaft bending cause rotor imbalance;

(8) The fan shaft and motor shaft are not concentric, and the pulley groove is misaligned.

2. Excessive motor current and high temperature rise:

(1) When driving, the valve in the intake pipe was not tightly closed, resulting in a load start;

(2) The flow rate exceeds the specified value, or the air duct leaks;

(3) The gas density input by the fan is too high or the temperature is too low, resulting in excessive pressure;

(4) The input voltage of the motor is too low or there is a single-phase power outage.