Piston type pipette capable of improving pipetting precision

Abstract

The invention discloses a piston type pipette capable of improving the pipetting precision. The piston type pipette comprises a pipette, a piston, a piston sealing ring, a pipette sealing ring and a piston moving device. The pipette comprises a pipette body, a vent groove, a top hole and a pipette body groove. The piston comprises a piston ring, a piston groove and a piston rod. The vent groove isformed in the pipette body, an upper end hole of the vent groove is formed in the upper portion of the side wall of the pipette body, a lower end hole of the vent groove is formed in the lower portion of an inner cavity of the side wall of the pipette body, the top hole and the pipette body groove are formed in the top wall of the pipette body, the pipette sealing ring is placed in the pipette body groove, the piston ring is arranged in the inner cavity of the pipette body, and the piston groove is formed in the side portion of the piston ring. The piston sealing ring is placed in the pistongroove, one end of the piston rod is connected with the piston ring, and the other end of the piston rod penetrates through the top hole to be connected with the piston moving device. According to thepiston type pipette, the pipetting precision of the piston type pipette can be improved on the premise that the machining precision is not improved.

Description

technical field [0001] The invention relates to the technical field of liquid filling, in particular to a piston-type pipette gun with improved pipetting precision. Background technique [0002] The pipette gun is one of the commonly used instruments in biological, medical and chemical laboratories. It is often used for the precise extraction of small or trace amounts of liquid in the laboratory. The working principle of the piston pipette is to use the piston to move to generate negative pressure so that the solution is sucked into the tip of the pipette, and the piston pipette used for micro-liquid suction is very small, so the diameter of the internal cavity of the pipette gun is The design is very small, the cross-sectional area is small, and the processing is difficult. In addition, in order to improve the accuracy of the pipette gun, the displacement accuracy of the piston movement must be improved, and the improvement of the displacement accuracy greatly increases the...

AI Technical Summary

Problems solved by technology

The working principle of the piston pipette is to use the piston to move to generate negative pressure so that the solution is sucked into the tip of the pipette, and the piston pipette used for micro-liquid suction is very small, so the diameter of the internal cavity of the pipette gun is The design is very small, the cross-sectional area is small, and the processing is difficult. In addition, in order to improve the accuracy of the pipette gun, the displacement accuracy of the piston movement must be improved, and the improvement of the displacement accuracy greatly increases the processing accuracy, thus greatly increasing the manufacturing difficulty. cost

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