Screw pump stator rubber sheath materials and methods how to choose
Rubber material screw stator is easily damaged important parts, it must consider the extent of the stator tooth profile accuracy and correctness of the material selected design development, which directly determines the length of the stator life. The selected rubber material formulation must take into account what transport media (media composition and corrosive media, etc.) and the temperature of the medium, and a rubber hardness of the rubber in the medium expansion and ultimate strength. Performance rubber pressure injection after, not only to determine the stator life, and even affect the normal operation of the pump can, for example: transport of oil medium NBR must be selected, because many rubber impatience oil medium; conveying hot media should choose fluorine rubber.To get more news about screw pump, you can visit hw-screwpump.com official website.
The stator rubber hardness is good or bad performance is extremely important indicator: It is based on the degree of resistance to the elastic surface that is perpendicular to the direction of the force of quantitative load quantification later he said. Our most commonly used Shore (A) hardness (measured standard GB / T 531-1983).
Usually choose hardness of rubber stator should consider: a medium containing particles should take lower, pure net media is desirable high hardness; low viscosity media, higher hardness may be appropriate:
Select the recipe of the stator rubber dynamic test to get a reliable basis for even though it is close to the hardness and physical properties similar to conventional, if the recipe is different, the results of the dynamic test is still a big gap.
The stator plastic material should be selected gum containing a higher rate and the low hardness of rubber material. Although the higher the hardness the better the resistance to deformation, but the permanent deformation is also greater. Therefore, from the overall performance, the better Rockwell hardness 65 ~ 70HR dynamic performance; with rubber permanent deformation rate is small.