Can the plastic impeller be ultrasonically welded?

The impeller is the component that works on the liquid. The impeller in the pump body is driven by the pump shaft to rotate at a high speed, so that the liquid flowing through the centrifugal pump obtains energy. That is to say, the mechanical energy is transferred to the liquid through the high-speed rotation of the impeller, so that the liquid can obtain high dynamic pressure energy.

Generally, the plastic impeller  is made of nylon 66 with glass fiber or PPS plastic material. Our welding equipment uses the principle of ultrasonic welding, and is equipped with automatic installation to increase the welding speed and ensure the welding accuracy.

PPS. PPE are all crystalline plastics with higher cultivation points. Melt viscosity is not good. In order to improve its mechanical properties, a proportion of glass fiber GF is usually added in use. Therefore, PPS. PPE lining does not have self-contained Ultrasonic welding performance.

Use high-power ultrasonic equipment for welding production and processing. If the volume is small, for example, the diameter is less than 60, you can use the 3000W ultrasonic welding model. If the impeller is not made of PPS material but made of ABS plastic material, there is no need for such a large power.

The diameter of the plastic impeller of the automobile water pump is generally between 8mm and 14mm, and the ultrasonic welding machine produced by our company is usually used in the two halves. Assembling the product is the core component of the automobile water pump. The main plastic material is PPS. Due to the particularity of the product, it cannot be injection molded. For example, in the later stage of the large output of plastic impeller, the automatic transformation of the ultrasonic welding machine model can be carried out to increase the output and optimize the production function.

Due to the many shortcomings of metal impellers, more and more household water pump manufacturers or automobile water pump manufacturers are beginning to develop and purchase plastic impellers to form water pumps at this stage. Both PPS and PPE plastics have excellent hydrolysis resistance and are usually widely used in fluid treatment.

 

The advantages of PPS or PPE impeller:

(1) Stable performance. The geometry and size of the impeller flow path have the greatest impact on the performance of the pump. The flow path shape of the plastic impeller is guaranteed and the dimensional accuracy is high, so the performance is stable.

(2) The smoothness of the runner is high, and the hydraulic loss is small. Generally, the maximum roughness of the runner of cast impeller can reach R.25/-M, and the roughness of the runner of plastic impeller can reach the maximum of R3.3m. Reduce n hydraulic loss. Especially for low specific speed pumps, the impeller flow path is narrow and long, reducing roughness has a significant effect on improving pump efficiency.

(3) Good balance, stable operation; light weight, easy to assemble and maintain.

(4) Low cost of mass production. The use of one-time molding technology saves processing costs. In addition, the plastic impeller has the advantages of corrosion resistance and low water pollution.

 

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