When selecting a shield pump, consider the following factors:
1. Water pump and water contact parts of the material and structure:
The whole process of circulating water in the water pump is in contact with the pump shell, so the material selection of the pump shell has a great influence on the water quality. Currently on the market for the sale of the pump casing pump mainly cast iron, bronze, composite materials, due to cost considerations, most of the air can be used to pump the pump casing. Cast iron prone to oxidation, the formation of metal oxides, which is rust, when the circulating water pump stops, will be able to increase the occurrence of oxides, resulting in two pollution of the circulating hot water. If the excessive intake of the body of this oxide will be a lot of damage, such as damage to the liver. Therefore, the construction of the use of composite pump casing made of the shield pump, it can prevent the pump casing rust caused by the two water pollution problems occur, greatly improve water quality.
2. Pump shaft and bearing to avoid scaling design:
Due to the shielding pump shaft and bearing lubrication is to rely on the transport medium for lubrication, to avoid pump shaft and bearing furring and shaft and bearing structure design of anti scale can appear abnormal important. Have a great influence on the selection of materials before the shaft and the bearing scale problem. It is reported that the majority of manufacturers to adopt is stainless steel as the material of the shaft and the bearing, so easily scaling, the shaft and the bearing are scale easily blocked. On the other hand is the wear performance of stainless steel is not strong, shaft and bearing long run in the future, the gap is more and more big, not only makes void node scale degree aggravating and blocked, and the gap increases after the pump noise and vibration is greatly increased. Some manufacturers of pumps use the ceramic, ceramic and stainless steel compared to more not easy to adsorb scale, together, ceramic with high hardness, good wear resistance between the shaft and the bearing, the stable work of the water pump, low noise, can greatly reduce the scale of, and then to avoid settle scale blocked bad happened.
