"A multi-stage centrifugal blower, often constructed with casting, operates by utilizing a high-speed rotating impeller to perform work on the gas. This action increases the gas pressure and velocity. The gas, now at a certain pressure and moving at a higher velocity, exits the periphery of the impeller and flows into a diffuser. Here, the velocity of the gas decreases as a portion of its kinetic energy is converted into potential energy, which in turn further elevates the gas pressure. Subsequently, the gas passes through the bend and return channel, entering the next compression unit for continued compression. After undergoing compression in multiple stages of impellers, the gas reaches the required pressure and is then collected by the volute casing before being discharged through the exhaust port into the system."

 

What Are Multistage Centrifugal Blowers’ Main Components?

 

Blower: The blower is designed and constructed to be robust and durable, with simple maintenance and easy control. The housing is made of cast iron HT250. An externally hung bearing structure is employed, where the impeller is mounted on a high-strength main shaft, supported by high-precision bearings. The bearing is designed to have a minimum service life of 30,000 hours (4 years). The blower features a scientifically designed return channel and guide vanes, with an expansion design on the housing that effectively enhances the efficiency of the blower. A contactless labyrinth seal is used to prevent leakage and ensure that the bearing lubricant remains uncontaminated. The sealing ring can be replaced without disassembling the inlet and outlet pipes. The inlet and outlet are connected by flanges, and the orientation can be chosen according to design requirements. The blower is precision-manufactured as an integral cast iron unit. Probes for measuring bearing temperature are installed on both ends of the blower, and the detection signals are sent to the on-site PLC or the user's control system for alarm and interlock shutdown protection.

 

Impeller: The blower rotor is made from high-strength aluminum alloy ZL105A, cast into shape. The impeller blade passage is designed using advanced quasi-three-dimensional (triple flow) design, which significantly improves the operational efficiency of the blower. The impeller undergoes overspeed testing to ensure its mechanical properties.

 

Bearings: The blower bearings are made by SKF. Temperature monitoring instruments are installed on both the drive end and non-drive end bearing housings to monitor the temperature parameters of the bearings in real-time. These can be displayed in the local control cabinet or the user's control system. The control system provides effective protection for the bearings based on temperature parameters to prevent damage.

 

Shaft: The blower shaft is made from high-quality, high-strength alloy steel. Computer simulation is used to establish a three-dimensional computational model and a large calculation grid for the complex geometric shape of the multi-stage rotor. This accurately simulates the impact of important parameters such as mass, center of gravity position, polar moment of inertia, and rotational inertia, calculates the vibration modes, frequencies, and amplitudes of each mode to ensure the dynamic performance of the shaft.

 

Coupling: The motor and blower power transmission use a JM series flexible diaphragm coupling, which can transmit torque at least 1.5 times greater than the motor torque. Compared to the bolted coupling, the diaphragm coupling not only has good transmission performance but is also very convenient to install and remove, without the need to move the motor or the blower. There is no need to re-align after reinstallation.

 

Base: Designed according to the dimensions of the blower and motor, made by welding Q235A steel. The base undergoes stress-relieving treatment of welding stresses before equipment installation to prevent deformation after the blower has been operating on-site for a period of time. The installation positions of the motor and blower are unified on a plane through machine processing to ensure the installation accuracy of the motor and blower.