Three screw pump screw prerequisites The 3G three screw pump is mainly composed of a bushing (pump cylinder) fixed in the pump body and an active screw rod inserted in the pump cylinder and two driven screws engaged with the screw rod. Three intermeshing screws, in the pump cylinder by each lead to form a sealed chamber, resulting in suction and discharge between the seal. Pump work, due to the two driven screw symmetrical with the active screw meshing, so the role of the radial force on the active screw completely balanced, the active screw does not bear the bending load. The radial force exerted by the follower screw is supported by the pump cylinder bushing along its entire length. Therefore, it is not necessary to provide a separate bearing on the outer end and substantially not to bear the bending load. In operation, a layer of oil film formed between the outer surface of the screw and the inner wall of the pump cylinder can prevent the direct contact between the metal and greatly reduce the wear of the screw tooth surface. Screw pump work, both ends of the role of the liquid suction pressure, so the screw to produce axial thrust. For small pumps with differential pressure less than 10 kgf / cm2, thrust bearings can be used. In addition, high pressure oil is introduced into the bottom of each screw sleeve through the center bore of the active screw to create a balanced thrust at the lower end of the screw that is counter to axial thrust. Screw Pump Like other positive displacement pumps, when the pump outlet is completely closed, the pressure inside the pump rises to the point of damaging the pump or overloading the motor. Therefore, the suction pump outlet, you must set the safety valve. 1, high temperature, high temperature deformation; 2, wear resistance, long life; 3, corrosion-resistant materials corrosive; 4, high strength, can withstand high torque, high speed; 5, with good cutting performance ; 6, Residual stress after heat treatment is small, small thermal deformation.
When there is liquid in the Pipette tip, do not place the pipette horizontally or upside down, so as to prevent the liquid from flowing back and corroding the piston spring.In the process of biological experiments, especially in the field of Cell Culture, the pipette is an indispensable laboratory instrument, and the pipette holder is also used very frequently on the laboratory ultra-clean bench or in the biological safety cabinet. The ease of use of the pipette and the pipette holder also affects the ease of experimental operation.
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