Corrosion-resistant fluoroplastic pump and what is the difference between the stainless steel pump performance?

Fluorine plastic and stainless steel pump has the corrosion resistance of the pump, fluorine plastic pump generally divided into, fluorine plastic centrifugal pump, fluorine plastic magnetic water pump, fluorine plastic alloy pump. Can be divided into the stainless steel pump, stainless steel centrifugal water pump, stainless steel magnetic pump. Fluorine plastic and stainless steel pump has a vertical structure and horizontal structure, has the imbibition, magnetic, centrifugal, then these two kinds of anti-corrosive pump in performance what's the difference? Also known as king of plastic, fluorine plastic materials can be delivery any concentration of strong acid, strong alkali, strong corrosion solution, generally stainless steel material is suitable for conveying liquid corrosion, stainless steel pump and heat-resistant wear-resistant effect is good, fluorine plastic pump corrosion effect is good, it is show that the performance of the overall lack of place. From the above structure, due to the great differences in the stainless steel pump and plastic pump performance, the structure of the stainless steel pump design has the following characteristics. A, 1, impeller impeller and shaft connection form embedded within the metal parts, through the metal parts connected to the shaft with a key, or impeller and shaft directly with key links, end with impeller impeller nut protection. This structure is derived from the metal pump, because of the sealing surface, poor reliability. After long time use, shaft susceptible to corrosion medium. 2, embedded within the impeller metal parts, and the pump shaft with threaded connections, cancel the impeller nut. This structure can make the shaft is completely protected, avoid shaft is the possibility of corrosion medium. The disadvantage is that thread machining precision demand is higher, it is strictly prohibited to motor reversal during operation. Second, the pump body lining thickness and fixed by pump enterprise standards, lining thickness is 5 - commonly 8 mm, if the lining layer too thin, Such as 1. 5~2mm) Lining, pressing process is easy to appear local defects, lead to pump allows the use of a drop in temperature, and the service life, the lining layer from the pump body and the possibility of back cover substrate metal loss also increased. Lining layer fixed way can take on the substrate metal decorate a dense ring dovetail groove, the method of fixation, the lining layer with time was small. Also available substrate metal decorate the holes ( Or threaded hole) Method of lining layer is better than a fixed dovetail groove. Three, the stress of the interface of plastic pump import and export over yet have relevant standards to limit, generally by the design unit, and according to the manufacturer's own manufacturing conditions. For the whole plastic pump shell, generally USES living way of flange and pipe connection, lap joint flange on both ends of the cover plate and connectivity; Also can adopt the way of the flange and cover board make it whole and pipeline connection. Four, impeller seal and back to the functioning of the pump body clearance for plastic and glass fiber reinforced plastic coefficient of linear expansion of 2 ~ 6 times larger than steel, use stainless steel pump running clearance prone to bite, the damage of the pump. Clearance is too large and will reduce the efficiency of the pump, and water pump axial force caused by the imbalance. Due to radial clearance cannot adjust, also can consider to use axial clearance, so need to pump, can check and adjust the clearance operation, in order to prevent the temperature change caused by the plastic on the pump shell peeling or cracking, can consider to tortoise shell on the pump shell welding wire mesh, so as to make the lining plastic pump can do bigger specifications, pipe diameter of DN600 imports. Five, the balance of axial force of fluorine plastic pump impeller with metal parts, should not be commonly use the balancing method of axial force. Widely used at home and abroad back vane axial force balance.
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