The purpose of the fan

The 10-19 type fan is generally used for high-pressure forced ventilation or pneumatic conveying of materials and materials in industries such as metallurgy, petroleum, chemical, grain, and building materials. Suitable for transporting air and gases that are non corrosive, non explosive, non self igniting, and do not contain viscous substances. The temperature of the medium generally does not exceed 50 ℃ (up to a maximum of 80 ℃), and the dust and hard fine particles contained in the medium do not exceed 150mg/m³

Type of fan

1. The fan mechanism is single suction, with four machine numbers: 8D, 8.4D, 8.6D, and 9D.

2. The fan can be made into two types: clockwise rotation or counterclockwise rotation. Looking at the fan from the transmission component, if the impeller rotates clockwise, it is called a clockwise rotation fan, represented by "clockwise", and counterclockwise rotation is called a counterclockwise rotation fan, represented by "counterclockwise".

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

The structure of the fan

The fan is composed of components such as impeller, casing, air inlet, and transmission group.

impellerThe material is Q345 (16Mn). There are 12 forward curved blades in the long and short sections, evenly and alternately welded between the four circular arc wheel cover and the flat plate disc, forming a flow channel with a bladeless diffuser. The impeller is calibrated for static and dynamic balance, ensuring smooth and reliable operation.

ShellWelded from steel plates into a snail shaped shell as a whole.

Air inletThe converging and dispersing air inlet is made into a whole structure and fixed to the front cover plate with bolts.

transmission groupComposed of main shaft, bearing box, coupling and other components, the bearing box is an integral structure, using rolling bearings lubricated with oil.

Performance and selection of fans

The performance of the 10-19 fan is shown in Appendix 1

Installation and use of fans

Before installation: A comprehensive inspection of all components of the fan should be conducted to ensure that the parts are intact, the rotation direction of the impeller and the casing is consistent, the connections between each part are tight, and the main components such as the impeller, main shaft, and bearings are not damaged. Whether the transmission group is flexible, etc.

During installation: Pay attention to checking the casing. There should be no tools or debris that fall in or are left inside the casing. In order to prevent rust and reduce disassembly difficulties, a layer of lubricating grease or mechanical oil should be applied to some joint surfaces. The joint surface between the fan and the foundation and the connection surface between the fan and the inlet and outlet air ducts should be adjusted to fit naturally. Forced connection is not allowed, and the weight of the duct should not be added to the various components of the fan. Attention should be paid to ensuring the small flat position of the fan.

Installation requirements:

1. Install according to the position and dimensions shown on the drawing, and 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 installation, test the transmission assembly and check for any tightness or rubbing with the fixed parts.

3. After all installations are completed and the overall inspection is qualified, the fan can be put into trial operation.

4. To prevent motor overload and burnout, it is necessary to start the fan with no load (close the inlet valve and slightly open the outlet valve). If the situation is good, gradually open the valve until the predetermined working conditions are met. During operation, the current should be strictly controlled and not exceed the standard.

Operation of the fan

1. Before starting the fan, the following preparations should be made.

(1) Close the inlet valve and slightly open the outlet valve.

(2) Check if there is any odor or abnormal vibration in the fan and its system by "ordering". If there is, it should be eliminated. If not, the ordering time will gradually be extended until it runs normally.

(3) When the fan reaches normal speed during operation, the bearing temperature should be checked regularly. When there are no special requirements for bearing temperature, the bearing temperature rise should not exceed 40 ℃ of the ambient temperature, and the root mean square vibration velocity value of the bearing part should not exceed 6.3m/S. If there is severe vibration, impact, or rapid increase in bearing temperature of the fan, it must be stopped urgently.

Maintenance of fan

(1) The system is not allowed to operate with illness.

(2) The fan should be kept and used by a dedicated person.

(3) Regularly remove impurities such as dust and dirt inside the fan, and prevent rusting.

(4) The maintenance of the fan must be carried out during shutdown and power outage.

(5) Unauthorized personnel and individuals with limited mobility are prohibited from watching during fan maintenance and testing.

(6) During the wind turbine test run, no one is allowed to stand within ten meters in the direction of the wind turbine inlet and outlet.

(7) After repairing the fan, tools and other supplies should be counted to prevent them from being left inside the fan and pipeline.

(8) Except for changing the lubricant after each bolt repair, the lubricant should be replaced according to the actual situation under normal circumstances.

Main faults and causes of fans

1. Severe vibration of the fan

(1) The fan shaft and motor shaft are not concentric.

(2) Friction between the casing and impeller or between the air inlet and impeller.

(3) The stiffness of the foundation is insufficient or not firm enough.

(4) Loose rivets on the impeller or deformation of the impeller.

(5) The impeller shaft disc hole and shaft fit are loose.

(6) The connecting bolts between the casing, bearing seat and bracket, and between the bearing seat and bearing cover are loose.

(7) Poor installation of fan outlet and air duct leads to resonance.

(8) The rotor is unbalanced due to factors such as dust accumulation, dirt, blade wear, blade deformation, and shaft bending on the blades.

2. The temperature rise of the bearing is too high

(1) Severe vibration of the bearing box;

(2) Poor quality, deterioration, or impurities such as dust, sand, dirt, or insufficient filling of lubricants;

(3) The tightening force of the connecting bolts between the bearing box cover and seat may be too high or too low;

(4) The installation of the shaft and rolling bearings is skewed, and the front and rear bearings are not concentric;

(5) Damaged rolling bearings or bent shafts;

3. Excessive motor current or high temperature rise