The transportation of high-temperature medium puts higher requirements on the structure, materials and auxiliary system of the pump. Let's talk about the cooling requirements of different temperature changes and the company's applicable pump type:
1. For medium with temperature below 120 °C, usually not A special cooling system is set up, which uses its own medium to lubricate and cool. Such as DFL (W) H chemical pump, DFL (W) PH shielding chemical pump (protection level of shielded motor should exceed H grade when over 90 °C); and DFCZ common type and IH chemical pump can use temperature to adopt suspension structure The upper limit is 140 ° C ~ 160 ° C; IHF lining fluorine pump can be used up to 200 ° C; only CQB ordinary magnetic pump use temperature does not exceed 100 ° C. It is worth mentioning that the medium that is easy to crystallize or contains particles should be equipped with a sealing surface flushing line (designed with an interface).
2. For mediums above 120 °C and below 300 °C, a cooling chamber shall be provided on the pump cover. The sealing chamber shall also be connected to the coolant (with double mechanical seal), when the coolant is not allowed to penetrate into the medium. It should be taken after cooling its own medium (can be realized by simple heat exchanger). At present, the company has DFCZ type chemical process pump, GRG high temperature pipeline pump and HPK hot water circulation pump (under development) to choose from, and CQB-G high temperature type magnetic pump can be used for high temperature medium within 280 °C
3. For above 300 °C For high-temperature medium, not only the pump head part needs to be cooled, but also the suspension bearing chamber should be equipped with a cooling system. The pump structure is generally in the form of a central support. The mechanical seal is preferably a metal bellows type, but the price is high (the price is 10 for a common machine seal). Multiple times). At present, the DFAY centrifugal oil pump can reach a temperature of 420 ° C (under development).
