The shielded water pump eliminates the rotary sealing device of the traditional centrifugal water pump, and has the characteristics of no leakage, compact structure, small vibration and noise, high pump efficiency and low energy consumption. It has become the first choice for the air heat pump industry and the water circulation heating method. When choosing a shielded pump, consider the following factors:
1. Material and structure of water pump and water contact parts
The whole process of water circulation in the pump is in contact with the pump casing. Therefore, the material selection of the pump casing has a great influence on the water quality. The pump casings of shielded water pumps currently on the market mainly include cast iron, bronze, composite materials, etc. Due to cost considerations, most air energy manufacturers use cast iron pump casings. Cast iron is prone to oxidation reaction, forming metal oxides, that is, rust. When the circulating water pump stops, it may increase the generation of oxides and cause secondary pollution to the circulating hot water. If the body ingests too much of this oxide, it will cause a lot of damage, such as damage to the liver. Therefore, the construction of a shielded water pump made of a composite pump casing can prevent the secondary pollution of hot water caused by the rust of the pump casing and greatly improve the water quality. >
2. Design of pump shaft and bearing to prevent scaling
Since the lubrication of the shaft and bearing of the shielded pump is lubricated by the medium to be transported, it is extremely important to prevent the shaft of the pump, the scale of the bearing and the anti-scaling ability of the structural design of the shaft and the bearing. The choice of materials has a major impact on the problem of preventing scale build-up between the shaft and the bearing. It is reported that most manufacturers use stainless steel as the material of the shaft and bearing. On the one hand, stainless steel is easy to scale, and the shaft and bearing are easy to block after scaling. On the other hand, the wear resistance of stainless steel is not strong, and the shaft and bearing are long. After running-in, the gap will become larger and larger, which not only makes the scale in the gap worse, but also blocks the death, and the noise and vibration of the pump run greatly increase due to the increase of the gap. Some manufacturers use ceramics, ceramics and stainless steel are less likely to adsorb scale. At the same time, ceramics have high hardness and good wear resistance between shaft and bearing, which makes the pump run smoothly and has low noise, which can greatly reduce scale generation. In order to avoid the occurrence of fouling and blockage.
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Tag: Rotary seal Centrifugal pump Heat pump Selection points Scale
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